Mono-diameter wellbore casing

CA 02476080 2008-01-07

25791.71.04

MONO-DIAMETER WELLBORE CASING

Background of the Invention

[0003] This invention relates generally to wellbore casings, and in particular to wellbore casings that are formed using expandable tubing.

[0004] Conventionally, when a wellbore is created, a number of casings are installed in the borehole to prevent collapse of the borehole wall and to prevent undesired outflow of drilling fluid into the formation or inflow of fluid from the formation into the borehole. The borehole is drilled in intervals whereby a casing which is to be installed in a lower borehole interval is lowered through a previously installed casing of an upper borehole interval. As a consequence of this procedure the casing of the lower interval is of smaller diameter than the casing of the upper interval. Thus, the casings are in a nested arrangement with casing diameters decreasing in downward direction. Cement annuli are provided between the outer surfaces of the casings and the borehole wall to seal the casings from the borehole wall. As a consequence of this nested arrangement a relatively large borehole diameter is required at the upper part of the wellbore. Such a large borehole diameter involves increased costs due to heavy casing handling equipment, large drill bits and increased volumes of drilling fluid and drill cuttings. Moreover, increased drilling rig time is involved due to required cement pumping, cement hardening, required equipment changes due to large variations in hole diameters drilled in the course of the well, and the large volume of cuttings drilled and removed.

CA 02476080 2008-01-07

25791.71.04

[0005] The present invention is directed to overcoming one or more of the limitations of the existing procedures for forming new sections of casing in a wellbore.

Summary of the Invention

[0006] According to one aspect of the present invention, an apparatus for forming a wellbore casing in a borehole located in a subterranean formation including a preexisting wellbore casing is provided that includes a support member including a first fluid passage, an expansion cone coupled to the support member including a second fluid passage fluidicly coupled to the first fluid passage, an expandable tubular liner movably coupled to the expansion cone, and an expandable shoe coupled to the expandable tubular liner. The expansion cone is adjustable to a plurality of stationary positions.

[0007] According to another aspect of the present invention, a method of forming a wellbore casing in a subterranean formation having a preexisting wellbore casing positioned in a borehole is provided that includes installing a tubular liner, an adjustable expansion cone, and a shoe in the borehole, radially expanding at least a portion of the shoe by a process comprising: adjusting the adjustable expansion cone to a first outside diameter, and injecting a fluidic material into the shoe, and radially expanding at least a portion of the tubular liner by a process comprising: adjusting the adjustable expansion cone to a second outside diameter, and injecting a fluidic material into the borehole below the expansion cone.

[0008] According to another aspect of the present invention, a system for forming a wellbore casing in a subterranean formation having a preexisting wellbore casing positioned in a borehole is provided that includes means for installing a tubular liner, an adjustable expansion cone, and a shoe in the borehole, means for radially expanding at least a portion of the shoe comprising: means for adjusting the adjustable expansion cone to a first outside diameter, and means for injecting a fluidic material into the shoe, and means for radially expanding at least a portion of the tubular liner comprising: means for adjusting the adjustable expansion cone to a second outside diameter, and means for injecting a fluidic material into the borehole below the adjustable expansion cone.

[0009] According to another aspect of the present invention, a wellbore casing positioned in a borehole within a subterranean formation is provided that includes a first wellbore casing comprising: an upper portion of the first wellbore casing, and a lower portion of the first wellbore casing coupled to the upper portion of the first wellbore casing, wherein the inside diameter of the upper portion of the first wellbore casing is less than the inside diameter of the lower portion of the first wellbore casing, and a second wellbore casing comprising: an upper portion of the second wellbore casing that overlaps with and is coupled to the lower portion of the first wellbore casing, and a lower portion of the second wellbore casing coupled to the upper portion of the second wellbore casing, wherein the inside diameter of

CA 02476080 2008-01-07

25791.71.04 the upper portion of the second wellbore casing is less than the inside diameter of the lower portion of the second wellbore casing, and wherein the inside diameter of the upper portion of the first wellbore casing is equal to the inside diameter of the upper portion of the second wellbore casing. The second wellbore casing is coupled to the first wellbore casing by the process of: installing the second wellbore casing and an adjustable expansion cone within the borehole, radially expanding at least a portion of the lower portion of the second wellbore casing by a process comprising: adjusting the adjustable expansion cone to a first outside diameter, and injecting a fluidic material into the second wellbore casing, and radially expanding at least a portion of the upper portion of the second wellbore casing by a process comprising: adjusting the adjustable expansion cone to a second outside diameter, and injecting a fluidic material into the borehole below the adjustable expansion cone.

[00010] According to another aspect of the present invention, an apparatus for forming a wellbore casing in a borehole located in a subterranean formation including a preexisting wellbore casing is provided that includes a support member including a first fluid passage, a first adjustable expansion cone coupled to the support member including a second fluid passage fluidicly coupled to the first fluid passage, a second adjustable expansion cone coupled to the support member including a third fluid passage fluidicly coupled to the first fluid passage, an expandable tubular liner movably coupled to the first and second adjustable expansion cones, and an expandable shoe coupled to the expandable tubular liner.

[00011] According to another aspect of the present invention, a method of forming a wellbore casing in a subterranean formation having a preexisting wellbore casing positioned in a borehole is provided that includes installing a tubular liner, an upper adjustable expansion cone, a lower adjustable expansion cone, and a shoe in the borehole, radially expanding at least a portion of the shoe by a process comprising: adjusting the lower adjustable expansion cone to an increased outside diameter, and injecting a fluidic material into the shoe, and radially expanding at least a portion of the tubular liner by a process comprising: adjusting the lower adjustable expansion cone to a reduced outside diameter, adjusting the upper adjustable expansion cone to an increased outside diameter, and injecting a fluidic material into the borehole below the lower adjustable expansion cone.

[00012] According to another aspect of the present invention, a system for forming a wellbore casing in a subterranean formation having a preexisting wellbore casing positioned in a borehole is provided that includes means for installing a tubular liner, an upper adjustable expansion cone, a lower adjustable expansion cone, and a shoe in the borehole, means for radially expanding at least a portion of the shoe comprising: means for adjusting the lower adjustable expansion cone to an increased outside diameter, and means for

CA 02476080 2008-01-07

25791.71.04 injecting a fluidic material into the shoe, and means for radially expanding at least a portion of the tubular liner comprising: means for adjusting the lower adjustable expansion cone to a reduced outside diameter, means for adjusting the upper adjustable expansion cone to an increased outside diameter, and means for injecting a fluidic material into the borehole below the lower adjustable expansion cone.

[00013] According to another aspect of the present invention, a wellbore casing positioned in a borehole within a subterranean formation is provided that includes a first wellbore casing comprising: an upper portion of the first wellbore casing, and a lower portion of the first wellbore casing coupled to the upper portion of the first wellbore casing, wherein the inside diameter of the upper portion of the first wellbore casing is less than the inside diameter of the lower portion of the first wellbore casing, and a second wellbore casing comprising: an upper portion of the second wellbore casing that overlaps with and is coupled to the lower portion of the first wellbore casing, and a lower portion of the second wellbore casing coupled to the upper portion of the second wellbore casing, wherein the inside diameter of the upper portion of the second wellbore casing is less than the inside diameter of the lower portion of the second wellbore casing, and wherein the inside diameter of the upper portion of the first wellbore casing is equal to the inside diameter of the upper portion of the second wellbore casing. The second wellbore casing is coupled to the first wellbore casing by the process of: installing the second wellbore casing, an upper adjustable expansion cone, a lower adjustable expansion cone, and a shoe in the borehole, radially expanding at least a portion of the lower portion of the second wellbore casing shoe by a process comprising: adjusting the lower adjustable expansion cone to an increased outside diameter, and injecting a fluidic material into the lower portion of the second wellbore casing, and radially expanding at least a portion of the upper portion of the second wellbore casing by a process comprising: adjusting the lower adjustable expansion cone to a reduced outside diameter, adjusting the upper adjustable expansion cone to an increased outside diameter, and injecting a fluidic material into the borehole below the lower adjustable expansion cone.

Brief Description of the Drawings

[00014] FIG. 1 is a fragmentary cross-sectional view illustrating the drilling of a new section of a well borehole.

[00015] FIG. 2 is a fragmentary cross-sectional view illustrating the placement of an embodiment of an apparatus for creating a mono-diameter wellbore casing within the new section of the well borehole of FIG. 1.

[00016] FIG. 2a is a cross-sectional view of a portion of the shoe of the apparatus of FIG. 2.

CA 02476080 2008-01-07

25791.71.04

<td> [00017]</td><td> FIG. 2b is a cross-sectional view of another portion of the shoe of the</td>

apparatus of FIG. 2.

<td> [00018]</td><td> FIG. 2c is a cross-sectional view of another portion of the shoe of the</td>

apparatus of FIG. 2.

<td> [00019]</td><td> FIG. 2d is a cross-sectional view of another portion of the shoe of the</td>

apparatus of FIG. 2.

<td> [00020] FIG. 2c.</td><td> FIG. 2e is a cross-sectional view of a portion of the shoe of the apparatus of</td>

<td> [00021]</td><td> FIG. 3 is a fragmentary cross-sectional view illustrating the injection of a</td>

hardenable fluidic sealing material through the apparatus and into the new section of the well borehole of FIG. 2.

<td> [00022] FIG. 3.</td><td> FIG. 3a is a cross-sectional view of a portion of the shoe of the apparatus of</td>

<td> [00023] FIG. 3a.</td><td> FIG. 3b is a cross-sectional view of a portion of the shoe of the apparatus of</td>

<td> [00024]</td><td> FIG. 4 is a fragmentary cross-sectional view illustrating the injection of a</td>

fluidic material into the apparatus of FIG. 3 in order to fluidicly isolate the interior of the shoe.

<td> [00025] FIG. 4.</td><td> FIG. 4a is a cross-sectional view of a portion of the shoe of the apparatus of</td>

<td> [00026] FIG. 4a.</td><td> FIG. 4b is a cross-sectional view of a portion of the shoe of the apparatus of</td>

<td> [00027] FIG. 4.</td><td> FIG. 5 is a cross-sectional view illustrating the radial expansion of the shoe of</td>

<td> [00028]</td><td> FIG. 6 is a cross-sectional view illustrating the lowering of the expandable</td>

expansion cone into the radially expanded shoe of the apparatus of FIG. 5.

<td> [00029]</td><td> FIG. 7 is a cross-sectional view illustrating the expansion of the expandable</td>

expansion cone of the apparatus of FIG. 6.

<td> [00030]</td><td> FIG. 8 is a cross-sectional view illustrating the injection of fluidic material into</td>

the radially expanded shoe of the apparatus of FIG. 7.

<td> [00031]</td><td> FIG. 9 is a cross-sectional view illustrating the completion of the radial</td>

expansion of the expandable tubular member of the apparatus of FIG. 8.

<td> [00032]</td><td> FIG. 10 is a cross-sectional view illustrating the removal of the bottom portion</td>

of the radially expanded shoe of the apparatus of FIG. 9.

<td> [00033]</td><td> FIG. 11 is a cross-sectional view illustrating the formation of a mono-diameter</td>

wellbore casing that includes a plurality of overlapping mono-diameter wellbore casings.

CA 02476080 2008-01-07

25791.71.04

[00034] FIG. 12 is a fragmentary cross-sectional view illustrating the placement of an alternative embodiment of an apparatus for creating a mono-diameter wellbore casing within the wellbore of FIG. 1.

<td> [00035] FIG. 12.</td><td> FIG. 12a is a cross-sectional view of a portion of the shoe of the apparatus of</td>

<td> [00036] FIG. 12.</td><td> FIG. 12b is a cross-sectional view of a portion of the shoe of the apparatus of</td>

<td> [00037]</td><td> FIG. 12c is a cross-sectional view of another portion of the shoe of the</td>

apparatus of FIG. 12.

<td> [00038]</td><td> FIG. 12d is a cross-sectional view of another portion of the shoe of the</td>

apparatus of FIG. 12.

<td> [00039]</td><td> FIG. 13 is a fragmentary cross-sectional view illustrating the injection of a</td>

hardenable fluidic sealing material through the apparatus and into the new section of the well borehole of FIG. 12.

<td> [00040] FIG. 13.</td><td> FIG. 13a is a cross-sectional view of a portion of the shoe of the apparatus of</td>

<td> [00041]</td><td> FIG. 14 is a fragmentary cross-sectional view illustrating the injection of a</td>

fluidic material into the apparatus of FIG. 13 in order to fluidicly isolate the interior of the shoe.

<td> [00042] FIG. 14.</td><td> FIG. 14a is a cross-sectional view of a portion of the shoe of the apparatus of</td>

<td> [00043] of FIG. 14.</td><td> FIG. 15 is a cross-sectional view illustrating the radial expansion of the shoe</td>

<td> [00044]</td><td> FIG. 16 is a cross-sectional view illustrating the lowering of the expandable</td>

expansion cone into the radially expanded shoe of the apparatus of FIG. 15.

<td> [00045]</td><td> FIG. 17 is a cross-sectional view illustrating the expansion of the expandable</td>

expansion cone of the apparatus of FIG. 16.

<td> [00046]</td><td> FIG. 18 is a cross-sectional view illustrating the injection of fluidic material into</td>

the radially expanded shoe of the apparatus of FIG. 17.

<td> [00047]</td><td> FIG. 19 is a cross-sectional view illustrating the completion of the radial</td>

expansion of the expandable tubular member of the apparatus of FIG. 18.

<td> [00048]</td><td> FIG. 20 is a cross-sectional view illustrating the removal of the bottom portion</td>

of the radially expanded shoe of the apparatus of FIG. 19.

<td> [00049]</td><td> FIG. 21 is a cross-sectional view illustrating the lowering of the expandable</td>

expansion cone of an alternative embodiment of the apparatus for forming a wellbore casing into the radially expanded shoe of the apparatus of FIG. 6.

CA 02476080 2008-01-07

25791.71.04

[00050] FIG. 22 is a cross-sectional view illustrating the expansion of the expandable expansion cone of the apparatus of FIG. 21 to a first outside diameter.

[00051] FIG. 23 is a cross-sectional view illustrating the injection of fluidic material into the radially expanded shoe of the apparatus of FIG. 22.

[00052] FIG. 24 is a cross-sectional view illustrating the expansion of the expandable expansion cone of the apparatus of FIG. 23 to a second outside diameter.

[00053] FIG. 25 is a cross-sectional view illustrating the injection of fluidic material into the radially expanded shoe of the apparatus of FIG. 24.

[00054] FIG. 26 is a cross-sectional view illustrating the completion of the radial expansion of the expandable tubular member of the apparatus of FIG. 25.

[00055] FIG. 27 is a cross-sectional view illustrating the removal of the bottom portion of the radially expanded shoe of the apparatus of FIG. 26.

[00056] FIG. 28 is a cross-sectional view illustrating the formation of a mono-diameter wellbore casing that includes a plurality of overlapping mono-diameter wellbore casings.

[00057] FIG. 29 is a cross-sectional view illustrating the lowering of the expandable expansion cones of an alternative embodiment of the apparatus for forming a wellbore casing into the radially expanded shoe of the apparatus of FIG. 21.

[00058] FIG. 30 is a cross-sectional view illustrating the expansion of the lower expandable expansion cone of the apparatus of FIG. 29.

[00059] FIG. 31 is a cross-sectional view illustrating the injection of fluidic material into the radially expanded shoe of the apparatus of FIG. 30.

[00060] FIG. 32 is a cross-sectional view illustrating the expansion of the upper expandable expansion cone and the retraction of the lower expansion cone of the apparatus of FIG. 31.

[00061] FIG. 33 is a cross-sectional view illustrating the injection of fluidic material into the radially expanded shoe of the apparatus of FIG. 32.

[00062] FIG. 34 is a cross-sectional view illustrating the completion of the radial expansion of the expandable tubular member of the apparatus of FIG. 33.

[00063] FIG. 35 is a cross-sectional view illustrating the removal of the bottom portion of the radially expanded shoe of the apparatus of FIG. 34.

[00064] FIG. 36 is a cross-sectional view illustrating the formation of a mono-diameter wellbore casing that includes a plurality of overlapping mono-diameter wellbore casings

Detailed Description of the Illustrative Embodiments

[00065] Referring initially to FIGS. 1, 2, 2a, 2b, 2c, 2d, 2e, 3, 3a, 3b, 4, 4a, 4b, and 510, an embodiment of an apparatus and method for forming a mono-diameter wellbore casing within a subterranean formation will now be described. As illustrated in Fig. 1, a

CA 02476080 2008-01-07

25791.71.04 wellbore 100 is positioned in a subterranean formation 105. The wellbore 100 includes a pre-existing cased section 110 having a tubular casing 115 and an annular outer layer 120 of a fluidic sealing material such as, for example, cement. The wellbore 100 may be positioned in any orientation from vertical to horizontal. In several alternative embodiments, the preexisting cased section 110 does not include the annular outer layer 120.

[00066] In order to extend the wellbore 100 into the subterranean formation 105, a drill string 125 is used in a well known manner to drill out material from the subterranean formation 105 to form a new wellbore section 130. In a preferred embodiment, the inside diameter of the new wellbore section 130 is greater than the inside diameter of the preexisting wellbore casing 115.

[00067] As illustrated in FIGS. 2, 2a, 2b, 2c, 2d, and 2e, an apparatus 200 for forming a wellbore casing in a subterranean formation is then positioned in the new section 130 of the wellbore 100. The apparatus 200 preferably includes an expansion cone 205 having a fluid passage 205a that supports a tubular member 210 that includes a lower portion 210c, an intermediate portion 210b, an upper portion 210c, and an upper end portion 210d.

[00068] The expansion cone 205 may be any number of conventional commercially available expansion cones. In several alternative embodiments, the expansion cone 205 may be controllably expandable in the radial direction, for example, as disclosed in U.S. patent nos. 5,348,095, and/or 6,012,523.

[00069] The tubular member 210 may be fabricated from any number of conventional commercially available materials such as, for example, Oilfield Country Tubular Goods (OCTG), 13 chromium steel tubing/casing, or plastic tubing/casing. In a preferred embodiment, the tubular member 210 is fabricated from OCTG in order to maximize strength after expansion. In several alternative embodiments, the tubular member 210 may be solid and/or slotted. For typical tubular member 210 materials, the length of the tubular member 210 is preferably limited to between about 40 to 20,000 feet in length.

[00070] The lower portion 210a of the tubular member 210 preferably has a larger inside diameter than the upper portion 210c of the tubular member. In a preferred embodiment, the wall thickness of the intermediate portion 210b of the tubular member 201 is less than the wall thickness of the upper portion 210c of the tubular member in order to faciliate the initiation of the radial expansion process. In a preferred embodiment, the upper end portion 21 Od of the tubular member 210 is slotted, perforated, or otherwise modified to catch or slow down the expansion cone 205 when it completes the extrusion of tubular member 210. In a preferred embodiment, wall thickness of the upper end portion 21 Od of the tubular member 210 is gradually tapered in order to gradually reduce the required radial

CA 02476080 2008-01-07

25791.71.04 expansion forces during the latter stages of the radial expansion process. In this manner, shock loading conditions during the latter stages of the radial expansion process are at least minimized.

[00071] A shoe 215 is coupled to the lower portion 210a of the tubular member. The shoe 215 includes an upper portion 215a, an intermediate portion 215b, and lower portion 215c having a valveable fluid passage 220 that is preferably adapted to receive a plug, dart, or other similar element for controllably sealing the fluid passage 220. In this manner, the fluid passage 220 may be optimally sealed off by introducing a plug, dart and/or ball sealing elements into the fluid passage 220.

[00072] The upper and lower portions, 215a and 215c, of the shoe 215 are preferably substantially tubular, and the intermediate portion 215b of the shoe is preferably at least partially folded inwardly. Furthermore, in a preferred embodiment, when the intermediate portion 215b of the shoe 215 is unfolded by the application of fluid pressure to the interior region 230 of the shoe, the inside and outside diameters of the intermediate portion are preferably both greater than the inside and outside diameters of the upper and lower portions, 215a and 215c. In this manner, the outer circumference of the intermediate portion 215b of the shoe 215 is preferably greater than the outside circumferences of the upper and lower portions, 215a and 215b, of the shoe.

[00073] In a preferred embodiment, the shoe 215 further includes one or more through and side outlet ports in fluidic communication with the fluid passage 220. In this manner, the shoe 215 optimally injects hardenable fluidic sealing material into the region outside the shoe 215 and tubular member 210.

[00074] In an alternative embodiment, the flow passage 220 is omitted.

[00075] A support member 225 having fluid passages 225a and 225b is coupled to the expansion cone 205 for supporting the apparatus 200. The fluid passage 225a is preferably fluidicly coupled to the fluid passage 205a. In this manner, fluidic materials may be conveyed to and from the region 230 below the expansion cone 205 and above the bottom of the shoe 215. The fluid passage 225b is preferably fluidicly coupled to the fluid passage 225a and includes a conventional control valve. In this manner, during placement of the apparatus 200 within the wellbore 100, surge pressures can be relieved by the fluid passage 225b. In a preferred embodiment, the support member 225 further includes one or more conventional centralizers (not illustrated) to help stabilize the apparatus 200.

[00076] During placement of the apparatus 200 within the wellbore 100, the fluid passage 225a is preferably selected to transport materials such as, for example, drilling mud or formation fluids at flow rates and pressures ranging from about 0 to 3,000 gallons/minute and 0 to 9,000 psi in order to minimize drag on the tubular member being run and to

CA 02476080 2008-01-07

25791.71.04 minimize surge pressures exerted on the wellbore 130 which could cause a loss of wellbore fluids and lead to hole collapse. During placement of the apparatus 200 within the wellbore 100, the fluid passage 225b is preferably selected to convey fluidic materials at flow rates and pressures ranging from about 0 to 3,000 gallons/minute and 0 to 9,000 psi in order to reduce the drag on the apparatus 200 during insertion into the new section 130 of the wellbore 100 and to minimize surge pressures on the new wellbore section 130.

[00077] A cup seal 235 is coupled to and supported by the support member 225. The cup seal 235 prevents foreign materials from entering the interior region of the tubular member 210 adjacent to the expansion cone 205. The cup seal 235 may be any number of conventional commercially available cup seals such as, for example, TP cups, or Selective Injection Packer (SIP) cups modified in accordance with the teachings of the present disclosure. In a preferred embodiment, the cup seal 235 is a SIP cup seal, available from Halliburton Energy Services in Dallas, TX in order to optimally block foreign material and contain a body of lubricant. In several alternative embodiments, the cup seal 235 may include a plurality of cup seals.

[00078] One or more sealing members 240 are preferably coupled to and supported by the exterior surface of the upper end portion 21 Od of the tubular member 210. The sealing members 240 preferably provide an overlapping joint between the lower end portion 115a of the casing 115 and the upper end portion 210d of the tubular member 210. The sealing members 240 may be any number of conventional commercially available seals such as, for example, lead, rubber, Teflon, or epoxy seals modified in accordance with the teachings of the present disclosure. In a preferred embodiment, the sealing members 240 are molded from Stratalock epoxy available from Halliburton Energy Services in Dallas, TX in order to optimally provide a load bearing interference fit between the upper end portion 21 Od of the tubular member 210 and the lower end portion 115a of the existing casing 115.

[00079] In a preferred embodiment, the sealing members 240 are selected to optimally provide a sufficient frictional force to support the expanded tubular member 210 from the existing casing 115. In a preferred embodiment, the frictional force optimally provided by the sealing members 240 ranges from about 1,000 to 1,000,000 Ibf in order to optimally support the expanded tubular member 210.

[00080] In an alternative embodiment, the sealing members 240 are omitted from the upper end portion 210d of the tubular member 210, and a load bearing metal-to-metal interference fit is provided between upper end portion of the tubular member and the lower end portion 115a of the existing casing 115 by plastically deforming and radially expanding the tubular member into contact with the existing casing.

CA 02476080 2010-11-29

25791.71.04

[00081] In a preferred embodiment, a quantity of lubricant 245 is provided in the annular region above the expansion cone 205 within the interior of the tubular member 210. In this manner, the extrusion of the tubular member 210 off of the expansion cone 205 is facilitated. The lubricant 245 may be any number of conventional commercially available lubricants such as, for example, Lubriplate™, chlorine based lubricants, oil based lubricants or Climax™ 1500 Antisieze™ (3100). In a preferred embodiment, the lubricant 245 is Climax™ 1500 Antisieze™ (3100) available from Climax Lubricants and Equipment Co. in Houston, TX in order to optimally provide optimum lubrication to faciliate the expansion process.

[00082] In a preferred embodiment, the support member 225 is thoroughly cleaned prior to assembly to the remaining portions of the apparatus 200. In this manner, the introduction of foreign material into the apparatus 200 is minimized. This minimizes the possibility of foreign material clogging the various flow passages and valves of the apparatus 200.

[00083] In a preferred embodiment, before or after positioning the apparatus 200 within the new section 130 of the wellbore 100, a couple of wellbore volumes are circulated in order to ensure that no foreign materials are located within the wellbore 100 that might clog up the various flow passages and valves of the apparatus 200 and to ensure that no foreign material interferes with the expansion process.

[00084] As illustrated in FIGS. 2 and 2e, in a preferred embodiment, during placement of the apparatus 200 within the wellbore 100, fluidic materials 250 within the wellbore that are displaced by the apparatus are at least partially conveyed through the fluid passages 220, 205a, 225a, and 225b. In this manner, surge pressures created by the placement of the apparatus within the wellbore 100 are reduced.

[00085] As illustrated in FIGS. 3, 3a, and 3b, the fluid passage 225b is then closed and a hardenable fluidic sealing material 255 is then pumped from a surface location into the fluid passages 225a and 205a. The material 255 then passes from the fluid passage 205a into the interior region 230 of the shoe 215 below the expansion cone 205. The material 255 then passes from the interior region 230 into the fluid passage 220. The material 255 then exits the apparatus 200 and fills an annular region 260 between the exterior of the tubular member 210 and the interior wall of the new section 130 of the wellbore 100. Continued pumping of the material 255 causes the material to fill up at least a portion of the annular region 260.

[00086] The material 255 is preferably pumped into the annular region 260 at pressures and flow rates ranging, for example, from about 0 to 5000 psi and 0 to 1,500 gallons/min, respectively. The optimum flow rate and operating pressures vary as a function of the casing and wellbore sizes, wellbore section length, available pumping equipment, and

CA 02476080 2008-01-07

25791.71.04 fluid properties of the fluidic material being pumped. The optimum flow rate and operating pressure are preferably determined using conventional empirical methods.

[00087] The hardenable fluidic sealing material 255 may be any number of conventional commercially available hardenable fluidic sealing materials such as, for example, slag mix, cement, latex or epoxy. In a preferred embodiment, the hardenable fluidic sealing material 255 is a blended cement prepared specifically for the particular well section being drilled from Halliburton Energy Services in Dallas, TX in order to provide optimal support for tubular member 210 while also maintaining optimum flow characteristics so as to minimize difficulties during the displacement of cement in the annular region 260. The optimum blend of the blended cement is preferably determined using conventional empirical methods. In several alternative embodiments, the hardenable fluidic sealing material 255 is compressible before, during, or after curing.

[00088] The annular region 260 preferably is filled with the material 255 in sufficient quantities to ensure that, upon radial expansion of the tubular member 210, the annular region 260 of the new section 130 of the wellbore 100 will be filled with the material 255.

[00089] In an alternative embodiment, the injection of the material 255 into the annular region 260 is omitted, or is provided after the radial expansion of the tubular member 210.

[00090] As illustrated in FIGS. 4, 4a, and 4b, once the annular region 260 has been adequately filled with the material 255, a plug 265, or other similar device, is introduced into the fluid passage 220, thereby fluidicly isolating the interior region 230 from the annular region 260. In a preferred embodiment, a non-hardenable fluidic material 270 is then pumped into the interior region 230 causing the interior region to pressurize. In this manner, the interior region 230 of the expanded tubular member 210 will not contain significant amounts of the cured material 255. This also reduces and simplifies the cost of the entire process. Alternatively, the material 255 may be used during this phase of the process.

[00091] As illustrated in FIG. 5, in a preferred embodiment, the continued injection of the fluidic material 270 pressurizes the region 230 and unfolds the intermediate portion 215b of the shoe 215. In a preferred embodiment, the outside diameter of the unfolded intermediate portion 215b of the shoe 215 is greater than the outside diameter of the upper and lower portions, 215a and 215b, of the shoe. In a preferred embodiment, the inside and outside diameters of the unfolded intermediate portion 215b of the shoe 215 are greater than the inside and outside diameters, respectively, of the upper and lower portions, 215a and 215b, of the shoe. In a preferred embodiment, the inside diameter of the unfolded intermediate portion 215b of the shoe 215 is substantially equal to or greater than the inside

CA 02476080 2008-01-07

25791.71.04 diameter of the preexisting casing 115 in order to optimally facilitate the formation of a monodiameter wellbore casing.

[00092] As illustrated in FIG. 6, in a preferred embodiment, the expansion cone 205 is then lowered into the unfolded intermediate portion 215b of the shoe 215. In a preferred embodiment, the expansion cone 205 is lowered into the unfolded intermediate portion 215b of the shoe 215 until the bottom of the expansion cone is proximate the lower portion 215c of the shoe 215. In a preferred embodiment, during the lowering of the expansion cone 205 into the unfolded intermediate portion 215b of the shoe 215, the material 255 within the annular region 260 and/or the bottom of the wellbore section 130 maintains the shoe 215 in a substantially stationary position.

[00093] As illustrated in FIG. 7, in a preferred embodiment, the outside diameter of the expansion cone 205 is then increased. In a preferred embodiment, the outside diameter of the expansion cone 205 is increased as disclosed in U.S. patent nos. 5,348,095, and/or 6,012,523, the disclosures of which are incorporate herein by reference. In a preferred embodiment, the outside diameter of the radially expanded expansion cone 205 is substantially equal to the inside diameter of the preexisting wellbore casing 115.

[00094] In an alternative embodiment, the expansion cone 205 is not lowered into the radially expanded portion of the shoe 215 prior to being radially expanded. In this manner, the upper portion 210c of the shoe 210 may be radially expanded by the radial expansion of the expansion cone 205.

[00095] In another alternative embodiment, the expansion cone 205 is not radially expanded.

[00096] As illustrated in FIG. 8, in a preferred embodiment, a fluidic material 275 is then injected into the region 230 through the fluid passages 225a and 205a. In a preferred embodiment, once the interior region 230 becomes sufficiently pressurized, the upper portion 215a of the shoe 215 and the tubular member 210 are preferably plastically deformed, radially expanded, and extruded off of the expansion cone 205. Furthermore, in a preferred embodiment, during the end of the radial expansion process, the upper portion 210d of the tubular member and the lower portion of the preexisting casing 115 that overlap with one another are simultaneously plastically deformed and radially expanded. In this manner, a mono-diameter wellbore casing may be formed that includes the preexisting wellbore casing 115 and the radially expanded tubular member 210.

[00097] During the extrusion process, the expansion cone 205 may be raised out of the expanded portion of the tubular member 210. In a preferred embodiment, during the extrusion process, the expansion cone 205 is raised at approximately the same rate as the tubular member 210 is expanded in order to keep the tubular member 210 stationary relative

CA 02476080 2008-01-07

25791.71.04 to the new wellbore section 130. In this manner, an overlapping joint between the radially expanded tubular member 210 and the lower portion of the preexisting casing 115 may be optimally formed. In an alternative preferred embodiment, the expansion cone 205 is maintained in a stationary position during the extrusion process thereby allowing the tubular member 210 to extrude off of the expansion cone 205 and into the new wellbore section 130 under the force of gravity and the operating pressure of the interior region 230.

[00098] In a preferred embodiment, when the upper end portion 21 Od of the tubular member 210 and the lower portion of the preexisting casing 115 that overlap with one another are plastically deformed and radially expanded by the expansion cone 205, the expansion cone 205 is displaced out of the wellbore 100 by both the operating pressure within the region. 230 and a upwardly directed axial force applied to the tubular support member 225.

[00099] The overlapping joint between the lower portion of the preexisting casing 115 and the radially expanded tubular member 210 preferably provides a gaseous and fluidic seal. In a particularly preferred embodiment, the sealing members 245 optimally provide a fluidic and gaseous seal in the overlapping joint. In an alternative embodiment, the sealing members 245 are omitted.

[000100] In a preferred embodiment, the operating pressure and flow rate of the fluidic material 275 is controllably ramped down when the expansion cone 205 reaches the upper end portion 21 Od of the tubular member 210. In this manner, the sudden release of pressure caused by the complete extrusion of the tubular member 210 off of the expansion cone 205 can be minimized. In a preferred embodiment, the operating pressure is reduced in a substantially linear fashion from 100% to about 10% during the end of the extrusion process beginning when the expansion cone 205 is within about 5 feet from completion of the extrusion process.

[000101] Alternatively, or in combination, the wall thickness of the upper end portion 210d of the tubular member is tapered in order to gradually reduce the required operating pressure for plastically deforming and radially expanding the upper end portion of the tubular member. In this manner, shock loading of the apparatus is at least reduced.

[000102] Alternatively, or in combination, a shock absorber is provided in the support member 225 in order to absorb the shock caused by the sudden release of pressure. The shock absorber may comprise, for example, any conventional commercially available shock absorber, bumper sub, or jars adapted for use in wellbore operations.

[000103] Alternatively, or in combination, an expansion cone catching structure is provided in the upper end portion 21 Od of the tubular member 210 in order to catch or at least decelerate the expansion cone 205.

CA 02476080 2008-01-07

25791.71.04

[000104] In a preferred embodiment, the apparatus 200 is adapted to minimize tensile, burst, and friction effects upon the tubular member 210 during the expansion process. These effects will be depend upon the geometry of the expansion cone 205, the material composition of the tubular member 210 and expansion cone 205, the inner diameter of the tubular member 210, the wall thickness of the tubular member 210, the type of lubricant, and the yield strength of the tubular member 210. In general, the thicker the wall thickness, the smaller the inner diameter, and the greater the yield strength of the tubular member 210, then the greater the operating pressures required to extrude the tubular member 210 off of the expansion cone 205.

[000105] For typical tubular members 210, the extrusion of the tubular member 210 off of the expansion cone 205 will begin when the pressure of the interior region 230 reaches, for example, approximately 500 to 9,000 psi.

[000106] During the extrusion process, the expansion cone 205 may be raised out of the expanded portion of the tubular member 210 at rates ranging, for example, from about 0 to 5 ft/sec. In a preferred embodiment, during the extrusion process, the expansion cone 205 is raised out of the expanded portion of the tubular member 210 at rates ranging from about 0 to 2 ft/sec in order to minimize the time required for the expansion process while also permitting easy control of the expansion process.

[000107] As illustrated in FIG. 9, once the extrusion process is completed, the expansion cone 205 is removed from the wellbore 100. In a preferred embodiment, either before or after the removal of the expansion cone 205, the integrity of the fluidic seal of the overlapping joint between the upper end portion 210d of the tubular member 210 and the lower end portion 115a of the preexisting wellbore casing 115 is tested using conventional methods.

[000108] In a preferred embodiment, if the fluidic seal of the overlapping joint between the upper end portion 21 Od of the tubular member 210 and the lower end portion 115a of the casing 115 is satisfactory, then any uncured portion of the material 255 within the expanded tubular member 210 is then removed in a conventional manner such as, for example, circulating the uncured material out of the interior of the expanded tubular member 210. The expansion cone 205 is then pulled out of the wellbore section 130 and a drill bit or mill is used in combination with a conventional drilling assembly to drill out any hardened material 255 within the tubular member 210. In a preferred embodiment, the material 255 within the annular region 260 is then allowed to fully cure.

[000109] As illustrated in FIG. 10, the bottom portion 215c of the shoe 215 may then be removed by drilling out the bottom portion of the shoe using conventional drilling methods. The wellbore 100 may then be extended in a conventional manner using a conventional

CA 02476080 2008-01-07

25791.71.04 drilling assembly. In a preferred embodiment, the inside diameter of the extended portion of the wellbore 100 is greater than the inside diameter of the radially expanded shoe 215.

[000110] As illustrated in FIG. 11, the method of FIGS. 1-10 may be repeatedly performed in order to provide a mono-diameter wellbore casing that includes overlapping wellbore casings 115 and 210a-210e. The wellbore casing 115, and 210a-210e preferably include outer annular layers of fluidic sealing material. Alternatively, the outer annular layers of fluidic sealing material may be omitted. In this manner, a mono-diameter wellbore casing may be formed within the subterranean formation that extends for tens of thousands of feet. More generally still, the teachings of FIGS. 1-11 may be used to form a mono-diameter wellbore casing, a pipeline, a structural support, or a tunnel within a subterranean formation at any orientation from the vertical to the horizontal.

[000111] Ina preferred embodiment, the formation of a mono-diameter wellbore casing, as illustrated in FIGS. 1-11, is further provided as disclosed in one or more of the following: U.S. Patent Nos. 6,497,289; 6,823,937; 6,328,113; 6,568,471; 6,575,240; 6,557,640; 6,604,763; WO 01/04535; 6,634,431 and 6,745,845.

CA 02476080 2008-01-07

25791.71.04

[000112] Referring to FIGS. 12, 12a, 12b, 12c, and 12d, in an alternative embodiment, an apparatus 300 for forming a mono-diameter wellbore casing is positioned within the wellbore casing 115 that is substantially identical in design and operation to the apparatus 200 except that a shoe 305 is substituted for the shoe 215.

[000113] In a preferred embodiment, the shoe 305 includes an upper portion 305a, an intermediate portion 305b, and a lower portion 305c having a valveable fluid passage 310 that is preferably adapted to receive a plug, dart, or other similar element for controllably sealing the fluid passage 310. In this manner, the fluid passage 310 may be optimally sealed off by introducing a plug, dart and/or ball sealing elements into the fluid passage 310. [000114] The upper and lower portions, 305a and 305c, of the shoe 305 are preferably substantially tubular, and the intermediate portion 305b of the shoe includes corrugations 305ba-305bh. Furthermore, in a preferred embodiment, when the intermediate portion 305b of the shoe 305 is radially expanded by the application of fluid pressure to the interior 315 of the shoe 305, the inside and outside diameters of the radially expanded intermediate portion are preferably both greater than the inside and outside diameters of the upper and lower portions, 305a and 305c. In this manner, the outer circumference of the intermediate portion 305b of the shoe 305 is preferably greater than the outer circumferences of the upper and lower portions, 305a and 305c, of the shoe.

CA 02476080 2008-01-07

25791.71.04

[000115] In a preferred embodiment, the shoe 305 further includes one or more through and side outlet ports in fluidic communication with the fluid passage 310. In this manner, the shoe 305 optimally injects hardenable fluidic sealing material into the region outside the shoe 305 and tubular member 210.

[000116] In an alternative embodiment, the flow passage 310 is omitted.

[000117] In a preferred embodiment, as illustrated in FIGS. 12 and 12d, during placement of the apparatus 300 within the wellbore 100, fluidic materials 250 within the wellbore that are displaced by the apparatus are conveyed through the fluid passages 310, 205a, 225a, and 225b. In this manner, surge pressures created by the placement of the apparatus within the wellbore 100 are reduced.

[000118] In a preferred embodiment, as illustrated in FIG. 13 and 13a, the fluid passage 225b is then closed and a hardenable fluidic sealing material 255 is then pumped from a surface location into the fluid passages 225a and 205a. The material 255 then passes from the fluid passage 205a into the interior region 315 of the shoe 305 below the expansion cone 205. The material 255 then passes from the interior region 315 into the fluid passage 310. The material 255 then exits the apparatus 300 and fills the annular region 260 between the exterior of the tubular member 210 and the interior wall of the new section 130 of the wellbore 100. Continued pumping of the material 255 causes the material to fill up at least a portion of the annular region 260.

[000119] The material 255 is preferably pumped into the annular region 260 at pressures and flow rates ranging, for example, from about 0 to 5000 psi and 0 to 1,500 gallons/min, respectively. The optimum flow rate and operating pressures vary as a function of the casing and wellbore sizes, wellbore section length, available pumping equipment, and fluid properties of the fluidic material being pumped. The optimum flow rate and operating pressure are preferably determined using conventional empirical methods.

[000120] The hardenable fluidic sealing material 255 may be any number of conventional commercially available hardenable fluidic sealing materials such as, for example, slag mix, cement, latex or epoxy. In a preferred embodiment, the hardenable fluidic sealing material 255 is a blended cement prepared specifically for the particular well section being drilled from Halliburton Energy Services in Dallas, TX in order to provide optimal support for tubular member 210 while also maintaining optimum flow characteristics so as to minimize difficulties during the displacement of cement in the annular region 260. The optimum blend of the blended cement is preferably determined using conventional empirical methods. In several alternative embodiments, the hardenable fluidic sealing material 255 is compressible before, during, or after curing.

CA 02476080 2008-01-07

25791.71.04

[000121] The annular region 260 preferably is filled with the material 255 in sufficient quantities to ensure that, upon radial expansion of the tubular member 210, the annular region 260 of the new section 130 of the wellbore 100 will be filled with the material 255.

[000122] In an alternative embodiment, the injection of the material 255 into the annular region 260 is omitted.

[000123] As illustrated in FIGS. 14 and 14a, once the annular region 260 has been adequately filled with the material 255, a plug 265, or other similar device, is introduced into the fluid passage 3.10, thereby fluidicly isolating the interior region 315 from the annular region 260. In a preferred embodiment, a non-hardenable fluidic material 270 is then pumped into the interior region 315 causing the interior region to pressurize. In this manner, the interior region 315 will not contain significant amounts of the cured material 255. This also reduces and simplifies the cost of the entire process. Alternatively, the material 255 may be used during this phase of the process.

[000124] As illustrated in FIG. 15, in a preferred embodiment, the continued injection of the fluidic material 270 pressurizes the region 315 and unfolds the corrugations 305ba305bh of the intermediate portion 305b of the shoe 305. In a preferred embodiment, the outside diameter of the unfolded intermediate portion 305b of the shoe 305 is greater than the outside diameter of the upper and lower portions, 305a and 305b, of the shoe. In a preferred embodiment, the inside and outside diameters of the unfolded intermediate portion 305b of the shoe 305 are greater than the inside and outside diameters, respectively, of the upper and lower portions, 305a and 305b, of the shoe. In a preferred embodiment, the inside diameter of the unfolded intermediate portion 305b of the shoe 305 is substantially equal to or greater than the inside diameter of the preexisting casing 305 in order to optimize the formation of a mono-diameter wellbore casing.

[000125] As illustrated in FIG. 16, in a preferred embodiment, the expansion cone 205 is then lowered into the unfolded intermediate portion 305b of the shoe 305. In a preferred embodiment, the expansion cone 205 is lowered into the unfolded intermediate portion 305b of the shoe 305 until the bottom of the expansion cone is proximate the lower portion 305c of the shoe 305. In a preferred embodiment, during the lowering of the expansion cone 205 into the unfolded intermediate portion 305b of the shoe 305, the material 255 within the annular region 260 maintains the shoe 305 in a substantially stationary position.

[000126] As illustrated in FIG. 17, in a preferred embodiment, the outside diameter of the expansion cone 205 is then increased. In a preferred embodiment, the outside diameter of the expansion cone 205 is increased as disclosed in U.S. patent nos. 5,348,095, and/or 6,012,523. ' In a preferred

CA 02476080 2008-01-07

25791.71.04 embodiment, the outside diameter of the radially expanded expansion cone 205 is substantially equal to the inside diameter of the preexisting wellbore casing 115.

[000127] In an alternative embodiment, the expansion cone 205 is not lowered into the radially expanded portion of the shoe 305 prior to being radially expanded. In this manner, the upper portion 305c of the shoe 305 may be radially expanded by the radial expansion of the expansion cone 205.

[000128] In another alternative embodiment, the expansion cone 205 is not radially expanded.

[000129] As illustrated in FIG. 18, in a preferred embodiment, a fluidic material 275 is then injected into the region 315 through the fluid passages 225a and 205a. In a preferred embodiment, once the interior region 315 becomes sufficiently pressurized, the upper portion 305a of the shoe 305 and the tubular member 210 are preferably plastically deformed, radially expanded, and extruded off of the expansion cone 205. Furthermore, in a preferred embodiment, during the end of the radial expansion process, the upper portion 210d of the tubular member and the lower portion of the preexisting casing 115 that overlap with one another are simultaneously plastically deformed and radially expanded, in this manner, a mono-diameter wellbore casing may be formed that includes the preexisting wellbore casing 115 and the radially expanded tubular member 210.

[000130] During the extrusion process, the expansion cone 205 may be raised out of the expanded portion of the tubular member 210. In a preferred embodiment, during the extrusion process, the expansion cone 205 is raised at approximately the same rate as the tubular member 210 is expanded in order to keep the tubular member 210 stationary relative to the new wellbore section 130. In this manner, an overlapping joint between the radially expanded tubular member 210 and the lower portion of the preexisting casing 115 may be optimally formed. In an alternative preferred embodiment, the expansion cone 205 is maintained in a stationary position during the extrusion process thereby allowing the tubular member 210 to extrude off of the expansion cone 205 and into the new wellbore section 130 under the force of gravity and the operating pressure of the interior region 230.

[000131] In a preferred embodiment, when the upper end portion 210d of the tubular member 210 and the lower portion of the preexisting casing 115 that overlap with one another are plastically deformed and radially expanded by the expansion cone 205, the expansion cone 205 is displaced out of the wellbore 100 by both the operating pressure within the region 230 and a upwardly directed axial force applied to the tubular support member 225.

[000132] The overlapping joint between the lower portion of the preexisting casing 115 and the radially expanded tubular member 210 preferably provides a gaseous and fluidic

CA 02476080 2008-01-07

25791.71.04 seal. In a particularly preferred embodiment, the sealing members 245 optimally provide a fluidic and gaseous seal in the overlapping joint. In an alternative embodiment, the sealing members 245 are omitted.

[000133] In a preferred embodiment, the operating pressure and flow rate of the fluidic material 275 is controllably ramped down when the expansion cone 205 reaches the upper end portion 21 Od of the tubular member 210. In this manner, the sudden release of pressure caused by the complete extrusion of the tubular member 210 off of the expansion cone 205 can be minimized. In a preferred embodiment, the operating pressure is reduced in a substantially linear fashion from 100% to about 10% during the end of the extrusion process beginning when the expansion cone 205 is within about 5 feet from completion of the extrusion process.

[000134] Alternatively, or in combination, the wall thickness of the upper end portion 210d of the tubular member is tapered in order to gradually reduce the required operating pressure for plastically deforming and radially expanding the upper end portion of the tubular member. In this manner, shock loading of the apparatus may be at least partially minimized. [000135] Alternatively, or in combination, a shock absorber is provided in the support member 225 in order to absorb the shock caused by the sudden release of pressure. The shock absorber may comprise, for example, any conventional commercially available shock absorber adapted for use in wellbore operations.

[000136] Alternatively, or in combination, an expansion cone catching structure is provided in the upper end portion 21 Od of the tubular member 210 in order to catch or at least decelerate the expansion cone 205.

[000137] In a preferred embodiment, the apparatus 200 is adapted to minimize tensile, burst, and friction effects upon the tubular member 210 during the expansion process. These effects will be depend upon the geometry of the expansion cone 205, the material composition of the tubular member 210 and expansion cone 205, the inner diameter of the tubular member 210, the wall thickness of the tubular member 210, the type of lubricant, and the yield strength of the tubular member 210. In general, the thicker the wall thickness, the smaller the inner diameter, and the greater the yield strength of the tubular member 210, then the greater the operating pressures required to extrude the tubular member 210 off of the expansion cone 205.

[000138] For typical tubular members 210, the extrusion of the tubular member 210 off of the expansion cone 205 will begin when the pressure of the interior region 230 reaches, for example, approximately 500 to 9,000 psi.

[000139] During the extrusion process, the expansion cone 205 may be raised out of the expanded portion of the tubular member 210 at rates ranging, for example, from about 0

CA 02476080 2008-01-07

25791.71.04 to 5 ft/sec. In a preferred embodiment, during the extrusion process, the expansion cone 205 is raised out of the expanded portion of the tubular member 210 at rates ranging from about 0 to 2 ft/sec in order to minimize the time required for the expansion process while also permitting easy control of the expansion process.

[000140] As illustrated in FIG. 19, once the extrusion process is completed, the expansion cone 205 is removed from the wellbore 100. In a preferred embodiment, either before or after the removal of the expansion cone 205, the integrity of the fluidic seal of the overlapping joint between the upper end portion 210d of the tubular member 210 and the lower end portion 115a of the preexisting wellbore casing 115 is tested using conventional methods.

[000141] In a preferred embodiment, if the fluidic seal of the overlapping joint between the upper end portion 21 Od of the tubular member 210 and the lower end portion 115a of the casing 115 is satisfactory, then any uncured portion of the material 255 within the expanded tubular member 210 is then removed in a conventional manner such as, for example, circulating the uncured material out of the interior of the expanded tubular member 210. The expansion cone 205 is then pulled out of the wellbore section 130 and a drill bit or mill is used in combination with a conventional drilling assembly to drill out any hardened material 255 within the tubular member 210. In a preferred embodiment, the material 255 within the annular region 260 is then allowed to fully cure.

[000142] As illustrated in FIG. 20, the bottom portion 305c of the shoe 305 may then be removed by drilling out the bottom portion of the shoe using conventional drilling methods. The wellbore 100 may then be extended in a conventional manner using a conventional drilling assembly. In a preferred embodiment, the inside diameter of the extended portion of the wellbore is greater than the inside diameter of the radially expanded shoe 305.

[000143] The method of FIGS. 12-20 may be repeatedly performed in order to provide a mono-diameter wellbore casing that includes overlapping wellbore casings. The overlapping wellbore casing preferably include outer annular layers of fluidic sealing material. Alternatively, the outer annular layers of fluidic sealing material may be omitted. In this manner, a mono-diameter wellbore casing may be formed within the subterranean formation that extends for tens of thousands of feet. More generally still, the teachings of FIGS. 12-20 may be used to form a mono-diameter wellbore casing, a pipeline, a structural support, or a tunnel within a subterranean formation at any orientation from the vertical to the horizontal.

CA 02476080 2008-01-07

25791.71.04

[000144] In a preferred embodiment, the formation of a mono-diameter wellbore casing, as illustrated in FIGS. 12-20, is further provided as disclosed in one or more of the following: U.S. Patent Nos. 6,497,289; 6,823,937; 6,328,113; 6,568,471; 6,575,240; 6,557,640; 6,604,763; WO 01/04535; 6,634,431 and 6,745,845.

[000145] In several alternative embodiments, the apparatus 200 and 300 are used to form and/or repair wellbore casings, pipelines, and/or structural supports.

[000146] In several alternative embodiments, the folded geometries of the shoes 215 and 305 are provided in accordance with the teachings of U.S. Patent Nos. 5,425,559 and/or 5,794,702.

[000147] In an alternative embodiment, as illustrated in FIG. 21, the apparatus 200 includes Guiberson™ cup seals 405 that are coupled to the exterior of the support member 225 for sealingly engaging the interior surface of the tubular member 210 and a conventional expansion cone 410 that defines a passage 410a, that may be controllably expanded to a plurality of outer diameters, that is coupled to the support member 225. The expansion cone 410 is then lowered out of the lower portion 210c of the tubular member 210 into the unfolded intermediate portion 215b of the shoe 215 that is unfolded substantially as described above with reference to FIGS. 4 and 5. In a preferred embodiment, the expansion cone 410 is lowered out of the lower portion 210c of the tubular member 210 into the unfolded intermediate portion 215b of the shoe 215 until the bottom of the expansion cone is proximate the lower portion 215c of the shoe 215. In a preferred embodiment, during the lowering of the expansion cone 410 into the unfolded intermediate portion 215b of the shoe 215, the material 255 within the annular region 260 and/or the bottom of the wellbore section 130 maintains the shoe 215 in a substantially stationary position.

[000148] As illustrated in FIG. 22, in a preferred embodiment, the outside diameter of the expansion cone 410 is then increased thereby engaging the shoe 215. In an exemplary embodiment, the outside diameter of the expansion cone 410 is increased to a diameter that is greater than or equal to the inside diameter of the casing 115. In an exemplary embodiment, when the outside diameter of the expansion cone 410 is increased, the intermediate portion 215b of the shoe 215 is further unfolded, radially expanded, and/or radially expanded and plastically deformed. In an exemplary embodiment, the interface between the outside surface of the expansion cone 410 and the inside surface of the intermediate portion 215b of the shoe 215 is not fluid tight.

[000149] In an alternative embodiment, the expansion cone 410 is not lowered into the radially expanded portion of the shoe 215 prior to being radially expanded. In this manner, the upper portion 215a of the shoe 215 may be radially expanded and plastically deformed by the radial expansion of the expansion cone 410.

CA 02476080 2008-01-07

25791.71.04

[000150] In another alternative embodiment, the expansion cone 410 is not radially expanded.

[000151] As illustrated in FIG. 23, in an exemplary embodiment, a fluidic material 275 is then injected into the region 230 through the fluid passages 225a and 410a. In a exemplary embodiment, once the interior region 230 and an annular region 415 bounded by the Guiberson™ cup seal 405, the top of the expansion cone 410, the interior walls of the tubular member 210, and the exterior walls of the support member 225 become sufficiently pressurized, the expansion cone 410 is displaced upwardly relative to the intermediate portion 215b of the shoe 215 and the intermediate portion of the shoe is radially expanded and plastically deformed. In an exemplary embodiment, during the radial expansion of the intermediate portion 215b of the shoe 215, the interface between the outside surface of the expansion cone 410 and the inside surface of the intermediate portion 215b of the shoe 215 is not fluid tight. Moreover, in an exemplary embodiment, during the radial expansion of the intermediate portion 215b of the shoe 215, the Guiberson™ cup seal 405, by virtue of the pressurization of the annular region 415, pulls the expansion cone 410 through the intermediate portion 215b of the shoe 215.

[000152] As illustrated in FIGS. 24 and 25, the outside diameter of the expansion cone 410 is then controllably reduced. In an exemplary embodiment, the outside diameter of the expansion cone 410 is reduced to an outside diameter that is greater than the inside diameter of the upper portion 215a of the shoe 215. A fluidic material 275 is then injected into the region 230 through the fluid passages 225a and 410a. In a exemplary embodiment, once the interior region 230 and the annular region 415 become sufficiently pressurized, the expansion cone 410 is displaced upwardly relative to the upper portion 215a of the shoe 215 and the tubular member 210 and the upper portion of the shoe and the tubular member are radially expanded and plastically deformed. In an exemplary embodiment, during the radial expansion of the upper portion 215a of the shoe 215 and the tubular member 210, the interface between the outside surface of the expansion cone 410 and the inside surfaces of the upper portion 215a of the shoe 215 and the tubular member 210 is not fluid tight. Moreover, in an exemplary embodiment, during the radial expansion of the upper portion 215a of the shoe 215 and the tubular member 210, the Guiberson™ cup seal 405, by virtue of the pressurization of the annular region 415, pulls the expansion cone 410 through the upper portion 215a of the shoe 215 and the tubular member 210. In a exemplary embodiment, during the end of the radial expansion process, the upper portion 21 Od of the tubular member is radially expanded and plastically deformed into engagement with the lower portion of the preexisting casing 115. In this manner, the tubular member 210 and the shoe 215 are coupled to and supported by the preexisting casing 115.

CA 02476080 2008-01-07

25791.71.04

[000153] During the radial expansion process, the expansion cone 410 may be raised out of the expanded portion of the tubular member 210. In a exemplary embodiment, during the radial expansion process, the expansion cone 410 is raised at approximately the same rate as the tubular member 210 is expanded in order to keep the tubular member 210 stationary relative to the new wellbore section 130. In this manner, an overlapping joint between the radially expanded tubular member 210 and the lower portion of the preexisting casing 115 may be optimally formed. In an alternative exemplary embodiment, the expansion cone 410 is maintained in a stationary position during the radial expansion process thereby allowing the tubular member 210 to extrude off of the expansion cone 410 and into the new wellbore section 130 under the force of gravity and the operating pressure of the interior region 230.

[000154] In a exemplary embodiment, when the upper end portion 210d of the tubular member 210 and the lower portion of the preexisting casing 115 that overlap with one another are plastically deformed and radially expanded by the expansion cone 410, the expansion cone 410 is displaced out of the wellbore 100 by both the operating pressure within the region 230 and a upwardly directed axial force applied to the tubular support member 225.

[000155] The overlapping joint between the lower portion of the preexisting casing 115 and the radially expanded tubular member 210 preferably provides a gaseous and fluidic seal. In a particularly exemplary embodiment, the sealing members 245 optimally provide a fluidic and gaseous seal in the overlapping joint In an alternative embodiment, the sealing members 245 are omitted.

[000156] In a exemplary embodiment, the operating pressure and flow rate of the fluidic material 275 is eontrollably ramped down when the expansion cone 410 reaches the upper end portion 210d of the tubular member 210. In this manner, the sudden release of pressure caused by the complete radial expansion of the tubular member 210 off of the expansion cone 410 can be minimized. In a exemplary embodiment, the operating pressure is reduced in a substantially linear fashion from 100% to about 10% during the end of the radial expansion process beginning when the expansion cone 410 is within about 5 feet from completion of the radial expansion process.

[000157] Alternatively, or in combination, the wall thickness of the upper end portion 21 Od of the tubular member is tapered in order to gradually reduce the required operating pressure for plastically deforming and radially expanding the upper end portion of the tubular member. In this manner, shock loading of the apparatus is at least reduced.

[000158] Alternatively, or in combination, a shock absorber is provided in the support member 225 in order to absorb the shock caused by the sudden release of pressure. The

CA 02476080 2008-01-07

25791.71.04 shock absorber may comprise, for example, any conventional commercially available shock absorber, bumper sub, or jars adapted for use in wellbore operations.

[000159] Alternatively, or in combination, an expansion cone catching structure is provided in the upper end portion 21 Od of the tubular member 210 in order to catch or at least decelerate the expansion cone 410.

[000160] In a exemplary embodiment, the apparatus 200 is adapted to minimize tensile, burst, and friction effects upon the tubular member 210 during the expansion process. These effects will be depend upon the geometry of the expansion cone 410, the material composition of the tubular member 210 and expansion cone 410, the inner diameter of the tubular member 210, the wall thickness of the tubular member 210, the type of lubricant, and the yield strength of the tubular member 210. In general, the thicker the wall thickness, the smaller the inner diameter, and the greater the yield strength of the tubular member 210, then the greater the operating pressures required to extrude the tubular member 210 off of the expansion cone 410.

[000161] For typical tubular members 210, the radial expansion of the tubular member 210 off of the expansion cone 410 will begin when the pressure of the interior region 230 reaches, for example, approximately 500 to 9,000 psi.

[000162] During the radial expansion process, the expansion cone 410 may be raised out of the expanded portion of the tubular member 210 at rates ranging, for example, from about 0 to 5 ft/sec. In a exemplary embodiment, during the radial expansion process, the expansion cone 410 is raised out of the expanded portion of the tubular member 210 at rates ranging from about 0 to 2 ft/sec in order to minimize the time required for the expansion process while also permitting easy control of the expansion process.

[000163] As illustrated in FIG. 26, once the radial expansion process is completed, the expansion cone 410 is removed from the wellbore 100. In a exemplary embodiment, either before or after the removal of the expansion cone 410, the integrity of the fluidic seal of the overlapping joint between the upper end portion 21 Od of the tubular member 210 and the lower end portion 115a of the preexisting wellbore casing 115 is tested using conventional methods.

[000164] In a exemplary embodiment, if the fluidic seal of the overlapping joint between the upper end portion 210d of the tubular member 210 and the lower end portion 115a of the casing 115 is satisfactory, then any uncured portion of the material 255 within the expanded tubular member 210 is then removed in a conventional manner such as, for example, circulating the uncured material out of the interior of the expanded tubular member 210. The expansion cone 410 is then pulled out of the wellbore section 130 and a drill bit or mill is used in combination with a conventional drilling assembly to drill out any hardened material

CA 02476080 2008-01-07

25791.71.04

255 within the tubular member 210. In a exemplary embodiment, the material 255 within the annular region 260 is then allowed to fully cure.

[000165] As illustrated in FIG. 27, the bottom portion 215c of the shoe 215 may then be removed by drilling out the bottom portion of the shoe using conventional drilling methods. The remaining radially expanded portion of the intermediate portion 215b of the shoe 215 provides a bell shaped structure whose inside diameter is greater than the inside diameter of the radially expanded tubular member 210. The wellbore 100 may then be extended in a conventional manner using a conventional drilling assembly. In a exemplary embodiment, the inside diameter of the extended portion of the wellbore 100 is greater than the inside diameter of the radially expanded shoe 215.

[000166] As illustrated in FIG. 28, the method of FIGS. 21-27 may be repeatedly performed by coupling the upper ends of subsequently radially expanded tubular members 210 into the bell shaped structures of the earlier radially expanded intermediate portions 215b of the shoes 215 of the tubular members 210 thereby forming a mono-diameter wellbore casing that includes overlapping wellbore casings 210a-210d and corresponding shoes 215aa-215ad. The wellbore casings 210a-210d and corresponding shoes 215aa215ad preferably include outer annular layers of fluidic sealing material. Alternatively, the outer annular layers of fluidic sealing material may be omitted. In this manner, a monodiameter wellbore casing may be formed within the subterranean formation that extends for tens of thousands of feet. More generally still, the teachings of FIGS. 21-28 may be used to form a mono-diameter wellbore casing, a pipeline, a structural support, or a tunnel within a subterranean formation at any orientation from the vertical to the horizontal.

[000167] In an exemplary embodiment, the adjustable expansion cone 410 incorporates the teachings of one or more of the following: U.S. patent nos. 5,348,095, and/or 6,012,523, the disclosures of which are incorporated herein by reference, further modified in a conventional manner, to provide a plurality of adjustable stationary positions.

[000168] In an exemplary embodiment, the formation of a mono-diameter wellbore casing, as illustrated in FIGS. 21-28, is further provided as disclosed in one or more of the following: U.S. Patent Nos. 6,497,289; 6,823,937; 6,328,113; 6,568,471; 6,575,240; 6,557,640; 6,604,763; 6,634,431; 6,745,845 and

WO 01/04535.

[000169] In an alternative embodiment, as illustrated in FIG. 29, the apparatus 200 includes a conventional upper expandable expansion cone 420 that defines a passage 420a that is coupled to the support member 225, and a conventional lower expandable expansion cone 425 that defines a passage 425a that is also coupled to the support member 225. The

CA 02476080 2008-01-07

25791.71.04 lower expansion cone 425 is then lowered out of the lower portion 210c of the tubular member 210 into the unfolded intermediate portion 215b of the shoe 215 that is unfolded substantially as described above with reference to FIGS. 4 and 5. In a preferred embodiment, the lower expansion cone 425 is lowered into the unfolded intermediate portion 215b of the shoe 215 until the bottom of the lower expansion cone is proximate the lower portion 215c of the shoe 215. In a preferred embodiment, during the lowering of the lower expansion cone 425 into the unfolded intermediate portion 215b of the shoe 215, the material 255 within the annular region 260 and/or the bottom of the wellbore section 130 maintains the shoe 215 in a substantially stationary position.

[000170] As illustrated in FIG. 30, in a preferred embodiment, the outside diameter of the lower expansion cone 425 is then increased thereby engaging the shoe 215. In an exemplary embodiment, the outside diameter of the lower expansion cone 425 is increased to a diameter that is greater than or equal to the inside diameter of the casing 115. In an exemplary embodiment, when the outside diameter of the lower expansion cone 425 is increased, the intermediate portion 215b of the shoe 215 is further unfolded, radially expanded, and/or radially expanded and plastically deformed. In an exemplary embodiment, the interface between the outside surface of the lower expansion cone 425 and the inside surface of the intermediate portion 215b of the shoe 215 is not fluid tight.

[000171] In an alternative embodiment, the lower expansion cone 425 is not lowered into the radially expanded portion of the shoe 215 prior to being radially expanded. In this manner, the upper portion 215a of the shoe 215 may be radially expanded and plastically deformed by the radial expansion of the lower expansion cone 425.

[000172] In another alternative embodiment, the lower expansion cone 425 is not radially expanded.

[000173] As illustrated in FIG. 31, in an exemplary embodiment, a fluidic material 275 is then injected into the region 230 through the fluid passages 225a, 420a and 425a. In a exemplary embodiment, once the interior region 230 and an annular region 430 bounded by the Guiberson™ cup seal 405, the top of the lower expansion cone 425, the interior walls of the tubular member 210, and the exterior walls of the support member 225 become sufficiently pressurized, the lower expansion cone 425 is displaced upwardly relative to the intermediate portion 215b of the shoe 215 and the intermediate portion of the shoe is radially expanded and plastically deformed. In an exemplary embodiment, during the radial expansion of the intermediate portion 215b of the shoe 215, the interface between the outside surface of the lower expansion cone 425 and the inside surface of the intermediate portion 215b of the shoe 215 is not fluid tight. Moreover, in an exemplary embodiment, during the radial expansion of the intermediate portion 215b of the shoe 215, the

CA 02476080 2008-01-07

25791.71.04

Guiberson™ cup seal 405, by virtue of the pressurization of the annular region 430, pulls the lower expansion cone 425 through the intermediate portion 215b of the shoe 215.

[000174] As illustrated in FIGS. 32 and 33, the outside diameter of the lower expansion cone 425 is then controllably reduced and the outside diameter of the upper expansion cone 420 is controllably increased. In an exemplary embodiment, the outside diameter of the upper expansion cone 420 is increased to an outside diameter that is greater than the inside diameter of the upper portion 215a of the shoe 215, and the outside diameter of the lower expansion cone 425 is reduced to an outside diameter that is less than or equal to the outside diameter of the upper expansion cone. A fluidic material 275 is then injected into the region 230 through the fluid passages 225a, 420a and 425a. In a exemplary embodiment, once the interior region 230 and the annular region 430 become sufficiently pressurized, the upper expansion cone 420 is displaced upwardly relative to the upper portion 215a of the shoe 215 and the tubular member 210 and the upper portion of the shoe and the tubular member are radially expanded and plastically deformed. In an exemplary embodiment, during the radial expansion of the upper portion 215a of the shoe 215 and the tubular member 210, the interface between the outside surface of the upper expansion cone 420 and the inside surfaces of the upper portion 215a of the shoe 215 and the tubular member 210 is not fluid tight. Moreover, in an exemplary embodiment, during the radial expansion of the upper portion 215a of the shoe 215 and the tubular member 210, the Guiberson™ cup seal 405, by virtue of the pressurization of the annular region 415, pulls the upper expansion cone 420 through the upper portion 215a of the shoe 215 and the tubular member 210. In a exemplary embodiment, during the end of the radial expansion process, the upper portion 210d of the tubular member is radially expanded and plastically deformed into engagement with the lower portion of the preexisting casing 115. In this manner, the tubular member 210 and the shoe 215 are coupled to and supported by the preexisting casing 115.

[000175] During the radial expansion process, the upper expansion cone 420 may be raised out of the expanded portion of the tubular member 210. In a exemplary embodiment, during the radial expansion process, the upper expansion cone 420 is raised at approximately the same rate as the tubular member 210 is expanded in order to keep the tubular member 210 stationary relative to the new wellbore section 130. In this manner, an overlapping joint between the radially expanded tubular member 210 and the lower portion of the preexisting casing 115 may be optimally formed. In an alternative exemplary embodiment, the upper expansion cone 420 is maintained in a stationary position during the radial expansion process thereby allowing the tubular member 210 to extrude off of the upper expansion cone 420 and into the new wellbore section 130 under the force of gravity and the operating pressure of the interior region 230.

CA 02476080 2008-01-07

25791.71.04

[000176] In a exemplary embodiment, when the upper end portion 21 Od of the tubular member 210 and the lower portion of the preexisting casing 115 that overlap with one another are plastically deformed and radially expanded by the upper expansion cone 420, the upper expansion cone 420 is displaced out of the wellbore 100 by both the operating pressure within the region 230 and a upwardly directed axial force applied to the tubular support member 225.

[000177] The overlapping joint between the lower portion of the preexisting casing 115 and the radially expanded tubular member 210 preferably provides a gaseous and fluidic seal. In a particularly exemplary embodiment, the sealing members 245 optimally provide a fluidic and gaseous seal in the overlapping joint. In an alternative embodiment, the sealing members 245 are omitted.

[000178] In a exemplary embodiment, the operating pressure and flow rate of the fluidic material 275 is controllably ramped down when the upper expansion cone 420 reaches the upper end portion 21 Od of the tubular member 210. In this manner, the sudden release of pressure caused by the complete radial expansion of the tubular member 210 off of the upper expansion cone 420 can be minimized. In a exemplary embodiment, the operating pressure is reduced in a substantially linear fashion from 100% to about 10% during the end of the radial expansion process beginning when the upper expansion cone 420 is within about 5 feet from completion of the radial expansion process.

[000179] Alternatively, or in combination, the wall thickness of the upper end portion 21 Od of the tubular member is tapered in order to gradually reduce the required operating pressure for plastically deforming and radially expanding the upper end portion of the tubular member. In this manner, shock loading of the apparatus is at least reduced.

[000180] Alternatively, or in combination, a shock absorber is provided in the support member 225 in order to absorb the shock caused by the sudden release of pressure. The shock absorber may comprise, for example, any conventional commercially available shock absorber, bumper sub, or jars adapted for use in wellbore operations.

[000181] Alternatively, or in combination, an expansion cone catching structure is provided in the upper end portion 21 Od of the tubular member 210 in order to catch or at least decelerate the upper expansion cone 420.

[000182] In a exemplary embodiment, the apparatus 200 is adapted to minimize tensile, burst, and friction effects upon the tubular member 210 during the expansion process. These effects will be depend upon the geometries of the upper and lower expansion cones, 420 and 425, the material composition of the tubular member 210 and the upper and lower expansion cones, 420 and 425, the inner diameter of the tubular member 210, the wall thickness of the tubular member 210, the type of lubricant, and the yield

CA 02476080 2008-01-07

25791.71.04 strength of the tubular member 210. In general, the thicker the wall thickness, the smaller the inner diameter, and the greater the yield strength of the tubular member 210, then the greater the operating pressures required to extrude the tubular member 210 and the shoe 215 off of the upper and lower expansion cones, 420 and 425.

[000183] For typical tubular members 210, the radial expansion of the tubular member 210 off of the upper expansion cone 420 will begin when the pressure of the interior region 230 reaches, for example, approximately 500 to 9,000 psi.

[000184] During the radial expansion process, the upper expansion cone 420 may be raised out of the expanded portion of the tubular member 210 at rates ranging, for example, from about 0 to 5 ft/sec. In a exemplary embodiment, during the radial expansion process, the upper expansion cone 420 is raised out of the expanded portion of the tubular member 210 at rates ranging from about 0 to 2 ft/sec in order to minimize the time required for the expansion process while also permitting easy control of the expansion process.

[000185] As illustrated in FIG. 34, once the radial expansion process is completed, the upper expansion cone 420 is removed from the wellbore 100. In a exemplary embodiment, either before or after the removal of the upper expansion cone 420, the integrity of the fluidic seal of the overlapping joint between the upper end portion 21 Od of the tubular member 210 and the lower end portion 115a of the preexisting wellbore casing 115 is tested using conventional methods.

[000186] In a exemplary embodiment, if the fluidic seal of the overlapping joint between the upper end portion 210d of the tubular member 210 and the lower end portion 115a of the casing 115 is satisfactory, then any uncured portion of the material 255 within the expanded tubular member 210 is then removed in a conventional manner such as, for example, circulating the uncured material out of the interior of the expanded tubular member 210. The upper expansion cone 420 is then pulled out of the wellbore section 130 and a drill bit or mill is used in combination with a conventional drilling assembly to drill out any hardened material 255 within the tubular member 210. In a exemplary embodiment, the material 255 within the annular region 260 is then allowed to fully cure.

[000187] As illustrated in FIG. 35, the bottom portion 215c of the shoe 215 may then be removed by drilling out the bottom portion of the shoe using conventional drilling methods. The remaining radially expanded portion of the intermediate portion 215b of the shoe 215 provides a bell shaped structure whose inside diameter is greater than the inside diameter of the radially expanded tubular member 210. The wellbore 100 may then be extended in a conventional manner using a conventional drilling assembly. In a exemplary embodiment, the inside diameter of the extended portion of the wellbore 100 is greater than the inside diameter of the radially expanded shoe 215.

CA 02476080 2008-01-07

25791.71.04

[000188] As illustrated in FIG. 36, the method of FIGS. 29-35 may be repeatedly performed by coupling the upper ends of subsequently radially expanded tubular members 210 into the bell shaped structures of the earlier radially expanded intermediate portions 215b of the shoes 215 of the tubular members 210 thereby forming a mono-diameter wellbore casing that includes overlapping wellbore casings 210a-210d and corresponding shoes 215aa-215ad. The wellbore casings 210a-210d and corresponding shoes 215aa215ad preferably include outer annular layers of fluidic sealing material. Alternatively, the outer annular layers of fluidic sealing material may be omitted. In this manner, a monodiameter wellbore casing may be formed within the subterranean formation that extends for tens of thousands of feet. More generally still, the teachings of FIGS. 29-36 may be used to form a mono-diameter wellbore casing, a pipeline, a structural support, or a tunnel within a subterranean formation at any orientation from the vertical to the horizontal.

[000189] In an exemplary embodiment, the adjustable expansion cones, 420 and 425, incorporate the teachings of one or more of the following: U.S. patent nos. 5,348,095, and/or 6,012,523.

[000190] In an exemplary embodiment, the formation of a mono-diameter wellbore casing, as illustrated in FIGS. 29-36, is further provided as disclosed in one or more of the following: U.S. Patent Nos. 6,497,289; 6,823,937; 6,328,113; 6,568,471; 6,575,240; 6,557,640; 6,604,763; 6,634,431; 6,745,845 and

WO 01/04535.

[000191] An apparatus for forming a wellbore casing in a borehole located in a subterranean formation including a preexisting wellbore casing has been described that includes a support member including a first fluid passage, an expansion cone coupled to the support member including a second fluid passage fluidicly coupled to the first fluid passage, an expandable tubular liner movably coupled to the expansion cone, and an expandable shoe coupled to the expandable tubular liner. In a exemplary embodiment, the expansion cone is expandable. In a exemplary embodiment, the expandable shoe includes a valveable fluid passage for controlling the flow of fluidic materials out of the expandable shoe. In a exemplary embodiment, the expandable shoe includes: an expandable portion and a remaining portion, wherein the outer circumference of the expandable portion is greater than the outer circumference of the remaining portion. In a exemplary embodiment, the expandable portion includes: one or more inward folds. In a exemplary embodiment, the expandable portion includes: one or more corrugations. In a exemplary embodiment, the expandable shoe includes: one or more inward folds. In a exemplary embodiment, the expandable shoe includes: one or more corrugations.

CA 02476080 2008-01-07

25791.71.04

[000192] A shoe has also been described that includes an upper annular portion, an intermediate annular portion, and a lower annular portion, wherein the intermediate annular portion has an outer circumference that is larger than the outer circumferences of the upper and lower annular portions. In a exemplary embodiment, the lower annular portion includes a valveable fluid passage for controlling the flow of fluidic materials out of the shoe. In a exemplary embodiment, the intermediate portion includes one or more inward folds. In a exemplary embodiment, the intermediate portion includes one or more corrugations.

[000193] A method of forming a wellbore casing in a subterranean formation having a preexisting wellbore casing positioned in a borehole has also been described that includes installing a tubular liner, an expansion cone, and a shoe in the borehole, radially expanding at least a portion of the shoe by injecting a fluidic material into the shoe, and radially expanding at least a portion of the tubular liner by injecting a fluidic material into the borehole below the expansion cone. In a exemplary embodiment, the method further includes radially expanding the expansion cone. In a exemplary embodiment, the method further includes lowering the expansion cone into the radially expanded portion of the shoe, and radially expanding the expansion cone. In a exemplary embodiment, the method further includes radially expanding at least a portion of the shoe and the tubular liner by injecting a fluidic material into the borehole below the radially expanded expansion cone. In a exemplary embodiment, the method further includes injecting a hardenable fluidic sealing material into an annulus between the tubular liner and the borehole. In a exemplary embodiment, the method further includes radially expanding at least a portion of the preexisting wellbore casing. In a exemplary embodiment, the method further includes overlapping a portion of the radially expanded tubular liner with a portion of the preexisting wellbore casing. In a exemplary embodiment, the inside diameter of the radially expanded tubular liner is substantially equal to the inside diameter of a nonoverlapping portion of the preexisting wellbore casing. In a exemplary embodiment, the method further includes applying an axial force to the expansion cone. In a exemplary embodiment, the inside diameter of the radially expanded shoe is greater than or equal to the inside diameter of the radially expanded tubular liner.

[000194] An apparatus for forming a wellbore casing in a subterranean formation having a preexisting wellbore casing positioned in a borehole has also been described that includes means for installing a tubular liner, an expansion cone, and a shoe in the borehole, means for radially expanding at least a portion of the shoe, and means for radially expanding at least a portion of the tubular liner. In a exemplary embodiment, the apparatus further includes means for radially expanding the expansion cone. In a exemplary embodiment, the apparatus further includes means for lowering the expansion cone into the radially expanded

CA 02476080 2008-01-07

25791.71.04 portion of the shoe, and means for radially expanding the expansion cone. In a exemplary embodiment, the apparatus further includes means for injecting a fluidic material into the borehole below the radially expanded expansion cone. In a exemplary embodiment, the apparatus further includes means for injecting a hardenable fluidic sealing material into an annulus between the tubular liner and the borehole. In a exemplary embodiment, the apparatus further includes means for radially expanding at least a portion of the preexisting wellbore casing. In a exemplary embodiment, the apparatus further includes means for overlapping a portion of the radially expanded tubular liner with a portion of the preexisting wellbore casing. In a exemplary embodiment, the inside diameter of the radially expanded tubular liner is substantially equal to the inside diameter of a nonoverlapping portion of the preexisting wellbore casing. In a exemplary embodiment, the apparatus further includes means for applying an axial force to the expansion cone. In a exemplary embodiment, the inside diameter of the radially expanded shoe is greater than or equal to the inside diameter of the radially expanded tubular liner.

[000195] An apparatus for forming a wellbore casing within a subterranean formation including a preexisting wellbore casing positioned in a borehole has also been described that includes a tubular liner and means for radially expanding and coupling the tubular liner to an overlapping portion of the preexisting wellbore casing. The inside diameter of the radially expanded tubular liner is substantially equal to the inside diameter of a non-overlapping portion of the preexisting wellbore casing.

[000196] A wellbore casing positioned in a borehole within a subterranean formation has also been described that includes a first wellbore casing and a second wellbore casing coupled to and overlapping with the first wellbore casing, wherein the second wellbore casing is coupled to the first wellbore casing by the process of: installing the second wellbore casing, an expansion cone, and a shoe in the borehole, radially expanding at least a portion of the shoe by injecting a fluidic material into the shoe, and radially expanding at least a portion of the second wellbore casing by injecting a fluidic material into the borehole below the expansion cone. In a exemplary embodiment, the process for forming the wellbore casing further includes radially expanding the expansion cone. In a exemplary embodiment, the process for forming the wellbore casing further includes lowering the expansion cone into the radially expanded portion of the shoe, and radially expanding the expansion cone. In a exemplary embodiment, the process for forming the wellbore casing further includes radially expanding at least a portion of the shoe and the second wellbore casing by injecting a fluidic material into the borehole below the radially expanded expansion cone. In a exemplary embodiment, the process for forming the wellbore casing further includes injecting a hardenable fluidic sealing material into an annulus between the second wellbore casing and

CA 02476080 2008-01-07

25791.71.04 the borehole. In a exemplary embodiment, the process for forming the wellbore casing further includes radially expanding at least a portion of the first wellbore casing. In a exemplary embodiment, the process for forming the wellbore casing further includes overlapping a portion of the radially expanded second wellbore casing with a portion of the first wellbore casing. In a exemplary embodiment, the inside diameter of the radially expanded second wellbore casing is substantially equal to the inside diameter of a nonoverlapping portion of the first wellbore casing. In a exemplary embodiment, the process for forming the wellbore casing further includes applying an axial force to the expansion cone. In a exemplary embodiment, the inside diameter of the radially expanded shoe is greater than or equal to the inside diameter of the radially expanded second wellbore casing. [000197] A method of forming a tubular structure in a subterranean formation having a preexisting tubular member positioned in a borehole has also been described that includes installing a tubular liner, an expansion cone, and a shoe in the borehole, radially expanding at least a portion of the shoe by injecting a fluidic material into the shoe, and radially expanding at least a portion of the tubular liner by injecting a fluidic material into the borehole below the expansion cone. In a exemplary embodiment, the method further includes radially expanding the expansion cone. In a exemplary embodiment, the method further includes lowering the expansion cone into the radially expanded portion of the shoe, and radially expanding the expansion cone. In a exemplary embodiment, the method further includes radially expanding at least a portion of the shoe and the tubular liner by injecting a fluidic material into the borehole below the radially expanded expansion cone. In a exemplary embodiment, the method further includes injecting a hardenable fluidic sealing material into an annulus between the tubular liner , and the borehole. In a exemplary embodiment, the method further includes radially expanding at least a portion of the preexisting tubular member. In a exemplary embodiment, the method further includes overlapping a portion of the radially expanded tubular liner with a portion of the preexisting tubular member. In a exemplary embodiment, the inside diameter of the radially expanded tubular liner is substantially equal to the inside diameter of a nonoverlapping portion of the preexisting tubular member. In a exemplary embodiment, the method further includes applying an axial force to the expansion cone. In a exemplary embodiment, the inside diameter of the radially expanded shoe is greater than or equal to the inside diameter of the radially expanded tubular liner.

[000198] An apparatus for forming a tubular structure in a subterranean formation having a preexisting tubular member positioned in a borehole has also been described that includes means for installing a tubular liner, an expansion cone, and a shoe in the borehole, means for radially expanding at least a portion of the shoe, and means for radially expanding

CA 02476080 2008-01-07

25791.71.04 at least a portion of the tubular liner. In a exemplary embodiment, the apparatus further includes means for radially expanding the expansion cone. In a exemplary embodiment, the apparatus further includes means for lowering the expansion cone into the radially expanded portion of the shoe, and means for radially expanding the expansion cone. In a exemplary embodiment, the apparatus further includes means for injecting a fluidic material into the borehole below the radially expanded expansion cone. In a exemplary embodiment, the apparatus further includes means for injecting a hardenable fluidic sealing material into an annulus between the tubular liner and the borehole. In a exemplary embodiment, the apparatus further includes means for radially expanding at least a portion of the preexisting tubular member. In a exemplary embodiment, the apparatus further includes means for overlapping a portion of the radially expanded tubular liner with a portion of the preexisting tubular member. In a exemplary embodiment, the inside diameter of the radially expanded tubular liner is substantially equal to the inside diameter of a nonoverlapping portion of the preexisting tubular member. In a exemplary embodiment, the apparatus further includes means for applying an axial force to the expansion cone. In a exemplary embodiment, the inside diameter of the radially expanded shoe is greater than or equal to the inside diameter of the radially expanded tubular liner.

[000199] An apparatus for forming a tubular structure within a subterranean formation including a preexisting tubular member positioned in a borehole has also been described that includes a tubular liner and means for radially expanding and coupling the tubular liner to an overlapping portion of the preexisting tubular member. The inside diameter of the radially expanded tubular liner is substantially equal to the inside diameter of a nonoverlapping portion of the preexisting tubular member.

[000200] A tubular structure positioned in a borehole within a subterranean formation has also been described that includes a first tubular member and a second tubular member coupled to and overlapping with the first tubular member, wherein the second tubular member is coupled to the first tubular member by the process of: installing the second tubular member, an expansion cone, and a shoe in the borehole, radially expanding at least a portion of the shoe by injecting a fluidic material into the shoe, and radially expanding at least a portion of the second tubular member by injecting a fluidic material into the borehole below the expansion cone. In a exemplary embodiment, the process for forming the tubular structure further includes radially expanding the expansion cone. In a exemplary embodiment, the process for forming the tubular structure further includes lowering the expansion cone into the radially expanded portion of the shoe, and radially expanding the expansion cone. In a exemplary embodiment, the process for forming the tubular structure further includes radially expanding at least a portion of the shoe and the second tubular

CA 02476080 2008-01-07

25791.71.04 member by injecting a fluidic material into the borehole below the radially expanded expansion cone. In a exemplary embodiment, the process for forming the tubular structure further includes injecting a hardenable fluidic sealing material into an annulus between the second tubular member and the borehole. In a exemplary embodiment, the process for forming the tubular structure further includes radially expanding at least a portion of the first tubular member. In a exemplary embodiment, the process for forming the tubular structure further includes overlapping a portion of the radially expanded second tubular member with a portion of the. first tubular member. In a exemplary embodiment, the inside diameter of the radially expanded second tubular member is substantially equal to the inside diameter of a nonoverlapping portion of the first tubular member. In a exemplary embodiment, the process for forming the tubular structure further includes applying an axial force to the expansion cone. In a exemplary embodiment, the inside diameter of the radially expanded shoe is greater than or equal to the inside diameter of the radially expanded second tubular member.

[000201] An apparatus for forming a wellbore casing in a borehole located in a subterranean formation including a preexisting 'wellbore casing has also been described that includes a support member including a first fluid passage, an expansion cone coupled to the support member including a second fluid passage fluidicly coupled to the first fluid passage, an expandable tubular liner movably coupled to the expansion cone, and an expandable shoe coupled to the expandable tubular liner including a valveable fluid passage for controlling the flow of fluidic materials out of the èxpandable shoe, an expandable portion comprising one or more inward folds, and a remaining portion coupled to the expandable portion. The outer circumference of the expandable portion is greater than the outer circumference of the remaining portion, and the expansion cone is adjustable to a plurality of stationary positions.

[000202] A method of forming a wellbore casing in a subterranean formation having a preexisting wellbore casing positioned in a borehole has also been described that includes installing a tubular liner, an adjustable expansion cone, and a shoe in the borehole, radially expanding at least a portion of the shoe by a process comprising: lowering the adjustable expansion cone into the shoe, adjusting the adjustable expansion cone to a first outside diameter, pressurizing a region within the shoe below the adjustable expansion cone using a fluidic material, and pressurizing an annular region above the adjustable expansion cone using the fluidic material, and radially expanding at least a portion of the tubular liner by a process comprising: adjusting the adjustable expansion cone to a second outside diameter, pressurizing a region within the shoe below the adjustable expansion cone using a fluidic material, and pressurizing an annular region above the adjustable expansion cone using the

CA 02476080 2008-01-07

25791.71.04 fluidic material. The first outside diameter of the adjustable expansion cone is greater than the second outside diameter of the adjustable expansion cone.

[000203] A system for forming a wellbore casing in a subterranean formation having a preexisting wellbore casing positioned in a borehole has also been described that includes means for installing a tubular liner, an adjustable expansion cone, and a shoe in the borehole, means for radially expanding at least a portion of the shoe comprising: means for lowering the adjustable expansion cone into the shoe, means for adjusting the adjustable expansion cone to a first outside diameter, means for pressurizing a region within the shoe below the adjustable expansion cone using a fluidic material, and means for pressurizing an annular region above the adjustable expansion cone using the fluidic material, and means for radially expanding at least a portion of the tubular liner comprising: means for adjusting the adjustable expansion cone to a second outside diameter, means for pressurizing a region within the shoe below the adjustable expansion cone using a fluidic material, and means for pressurizing an annular region above the adjustable expansion cone using the fluidic material. The first outside diameter of the adjustable expansion cone is greater than the second outside diameter of the adjustable expansion cone.

[000204] A wellbore casing positioned in a borehole within a subterranean formation has also been described that includes a first wellbore casing including: an upper portion of the first wellbore casing, and a lower portion of the first wellbore casing coupled to the upper portion of the first wellbore casing, wherein the inside diameter of the upper portion of the first wellbore casing is less than the inside diameter of the lower portion of the first wellbore casing, and a second wellbore casing comprising: an upper portion of the second wellbore casing that overlaps with and is coupled to the lower portion of the first wellbore casing, and a lower portion of the second wellbore casing coupled to the upper portion of the second wellbore casing, wherein the inside diameter of the upper portion of the second wellbore casing is less than the inside diameter of the lower portion of the second wellbore casing, and wherein the inside diameter of the upper portion of the first wellbore casing is equal to the inside diameter of the upper portion of the second wellbore casing. The second wellbore casing is coupled to the first wellbore casing by the process of: installing the second wellbore casing and an adjustable expansion cone in the borehole, radially expanding at least a portion of the lower portion of the second wellbore casing by a process comprising: lowering the adjustable expansion cone into the lower portion of the second wellbore casing, adjusting the adjustable expansion cone to a first outside diameter, pressurizing a region within the lower portion of the second wellbore casing below the adjustable expansion cone using a fluidic material, and pressurizing an annular region above the adjustable expansion cone using the fluidic material, and radially expanding at least a portion of the upper portion

CA 02476080 2008-01-07

25791.71.04 of the second wellbore casing by a process comprising: adjusting the adjustable expansion cone to a second outside diameter, pressurizing a region within the shoe below the adjustable expansion cone using a fluidic material, and pressurizing an annular region above the adjustable expansion cone using the fluidic material. The first outside diameter of the adjustable expansion cone is greater than the second outside diameter of the adjustable expansion cone.

[000205] An apparatus for forming a wellbore casing in a borehole located in a subterranean formation including a preexisting wellbore casing has also been described that includes a support member including a first fluid passage, a first adjustable expansion cone coupled to the support member including a second fluid passage fluidicly coupled to the first fluid passage, a second adjustable expansion cone coupled to the support member including a third fluid passage fluidicly coupled to the first fluid passage, an expandable tubular liner movably coupled to the first and second adjustable expansion cones, and an expandable shoe coupled to the expandable tubular liner comprising: a valveable fluid passage for controlling the flow of fluidic materials out of the expandable shoe, an expandable portion comprising one or more inwards folds, and a remaining portion coupled to the expandable portion. The outer circumference of the expandable portion is greater than the outer circumference of the remaining portion.

[000206] A method of forming a wellbore casing in a subterranean formation having a preexisting wellbore casing positioned in a borehole has also been described that includes installing a tubular liner, an upper adjustable expansion cone, a lower adjustable expansion cone, and a shoe in the borehole, radially expanding at least a portion of the shoe by a process comprising: lowering the lower adjustable expansion cone into the shoe, adjusting the lower adjustable expansion cone to an increased outside diameter, pressurizing a region within the shoe below the lower adjustable expansion cone using a fluidic material, and pressurizing an annular region above the upper adjustable expansion cone using the fluidic material, and radially expanding at least a portion of the tubular liner by a process comprising: adjusting the lower adjustable expansion cone to a reduced outside diameter, adjusting the upper adjustable expansion cone to an increased outside diameter, pressurizing a region within the shoe below the lower adjustable expansion cone using a fluidic material, and pressurizing an annular region above the upper adjustable expansion cone using the fluidic material. The increased outside diameter of the lower adjustable expansion cone is greater than the increased outside diameter of the upper adjustable expansion cone, and the reduced outside diameter of the lower adjustable expansion cone is less than or equal to the increased outside diameter of the upper adjustable expansion cone.

CA 02476080 2008-01-07

25791.71.04

[000207] A system for forming a wellbore casing in a subterranean formation having a preexisting wellbore casing positioned in a borehole has also been described that includes means for installing a tubular liner, an upper adjustable expansion cone, a lower adjustable expansion cone, and a shoe in the borehole, means for radially expanding at least a portion of the shoe that comprises: means for lowering the lower adjustable expansion cone into the shoe, means for adjusting the lower adjustable expansion cone to an increased outside diameter, means for pressurizing a region within the shoe below the lower adjustable expansion cone using a fluidic material, and means for pressurizing an annular region above the upper adjustable expansion cone using the fluidic material, and means for radially expanding at least a portion of the tubular liner that comprises: means for adjusting the lower adjustable expansion cone to a reduced outside diameter, means for adjusting the upper adjustable expansion cone to an increased outside diameter, means for pressurizing a region within the shoe below the lower adjustable expansion cone using a fluidic material, and means for pressurizing an annular region above the upper adjustable expansion cone using the fluidic material. The increased outside diameter of the lower adjustable expansion cone is greater than the increased outside diameter of the upper adjustable expansion cone, and the reduced outside diameter of the lower adjustable expansion cone is less than or equal to the increased outside diameter of the upper adjustable expansion cone.

[000208] A wellbore casing positioned in a borehole within a subterranean formation has also been described that includes a first wellbore casing comprising: an upper portion of the first wellbore casing, and a lower portion of the first wellbore casing coupled to the upper portion of the first wellbore casing, wherein the inside diameter of the upper portion of the first wellbore casing is less than the inside diameter of the lower portion of the first wellbore casing, and a second wellbore casing comprising: an upper portion of the second wellbore casing that overlaps with and is coupled to the lower portion of the first wellbore casing, and a lower portion of the second wellbore casing coupled to the upper portion of the second wellbore casing. The inside diameter of the upper portion of the second wellbore casing is less than the inside diameter of the lower portion of the second wellbore casing, and the inside diameter of the upper portion of the first wellbore casing is equal to the inside diameter of the upper portion of the second wellbore casing. The second wellbore casing is coupled to the first wellbore casing by the process of: installing the second wellbore casing, an upper adjustable expansion cone, and a lower adjustable expansion cone in the borehole, radially expanding at least a portion of the shoe by a process comprising: lowering the lower adjustable expansion cone into the lower portion of the second wellbore casing, adjusting the lower adjustable expansion cone to an increased outside diameter, pressurizing a region within the lower portion of the second wellbore casing below the lower

CA 02476080 2008-01-07

25791.71.04 adjustable expansion cone using a fluidic material, and pressurizing an annular region above the upper adjustable expansion cone using the fluidic material, andradially expanding at least a portion of the upper portion of the second wellbore casing by a process comprising: adjusting the lower adjustable expansion cone to a reduced outside diameter, adjusting the upper adjustable expansion cone to an increased outside diameter, pressurizing a region within the lower portion of the second wellbore casing below the lower adjustable expansion cone using a fluidic material, and pressurizing an annular region above the upper adjustable expansion cone using the fluidic material. The increased outside diameter of the lower adjustable expansion cone is greater than the increased outside diameter of the upper adjustable expansion cone, and the reduced outside diameter of the lower adjustable expansion cone is less than or equal to the increased outside diameter of the upper adjustable expansion cone.

[000209] Although illustrative embodiments of the invention have been shown and described, a wide range of modification, changes and substitution is contemplated in the foregoing disclosure. In some instances, some features of the present invention may be employed without a corresponding use of the other features. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the scope of the invention.