Improved limit collar.

(54) Title: IMPROVED LIMIT NECKLACE.

(54) Title: IMPROVED LIMIT COLLAR.

(57) Summary

The present invention relates to a limit collar comprising a limit component coupled to a surface of a downhole tubular and an interface component coupling to the limit component, and methods of using the same.

(57) Abstract

The present invention relates to a limit collar (200) comprising a limil component (202) coupled to a surface of a wellbore tubular and an interface component (204) engaging the limit component (202), and to methods utilizing the same.

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PATENT TITLE No. 359598

HALLIBURTON ENERGY SERVICES, INC

10200 Bellaire Boulevard, Houston, Texas, 77072, USA

Denomination: IMPROVED LIMIT NECKLACE.

Classification:

CIP: E21B23 / 00

CPC: E21B23 / 0Q4

Inventor (s);

WILLIAM IAIN ELDER LEVIE

Number:

MX / a / 2016/009686

<img file="MX359598B_D0001.tif" />

ernational:

Country:

US

Validity: V ^ ifita, «ños, -x ·&gt; /·Λ.· '·

<img file="MX359598B_D0002.tif" />

Number:

13/093,242

Validity: * ** \ *

VWi date ^ mienár'z ^ dórf'rt ^^ Qáh '&lt;·&gt; _v-, · i · ..: «de '¿i. '^V i&gt;: f «·

Issue Date: September 17, 2018 &lt;*&gt;

The reference patent is granted on the basis of articles 1, ^ t; (raiíbiwX 'II, and 5% of the Industrial Property Law.

In accordance with article 23 of the Law, of the Igdustrtei, the present patjpte jjjineuna v®enpia de twenty: qflqp non-extendable, starting from the date of presentation of the solidKtidInternacional and will begiKije® at the payment of the, ttnfa to keep in force loe ^ tMrechos.

Whoever subscribes to this title does so, based on the provisions of the 6th section of the Article and 7th bis 2 of the Industrial Property Law (Official Gazette of the Federation (XWF.) 27'06 / 1991, reformed the p2íp M94, 10/4/1996, 12/26/1997 05/17/1999 01/26/2004, 06/16/2005, 01/25/2006, 05/06/2009, 01/06/2010 18 / 06 / 2Ü10, 06/26/2610, 27/61 / 2012,09 (04/2612, 06/01/201 | and 03/13/2018), articles 1, 3rd section V Subsection a), 4th and 12 “sections I and III of the Regulation of the Mejacano-Industrial Property Institute (D.OrF. 12/14/1999; amended on 07/01/2002, 07/15/2004, 07/28/2004 and 09/07/2007); articles 1, 3, 4, 5 ". fraction V. subsection a), -16 fractional ly and IILy, -3Q of the 'Hstétutd.Organico of the Mexican Institute of Industrial Property (DOF 27/12/1999, ΓβΛ&gt; Μη3όα «Ιι® / 4β (» | ^ 2 ^ 07 / 2ρ04. Q4 / O8 / 2O04 V J3 / ¿9/2007) ¡1 “, 3“ and 5 “clause a) of the Agreement that delegates powers to the Deputy Directors General, ®¿or0lr) to (lor,_lÜir8 # Í5r ^ 9ljivdyo't ^ »» ¿í¿ulelfes ^ lelSs Regional Offices, Divisional Deputy Directors, Departmental Coordinators and other junior-deí Instituto MexfcapO (je laVropféftWtf wdUeMef. (DOF 12/15/1999, amended on 04/02/1999) 2000, 07/29/2004, 04/08/2004, and 09/13/2007). 'I, counted at

This letter is signed with an advanced electronic signature (FIEL), based on articles 7 BIS 2 of the Industrial Property Law; 3 of its Regulations, and 1 fraction III, 2 fraction V, 26 BIS and 26 TER of the Agreement establishing the guidelines for the use of the Electronic Payment and Services Portal (PASE) of the Mexican Institute of Industrial Property, in the procedures indicated.

THE DIVISIONAL DIRECTOR OF PATENTS

NAHANNY CANAL REYES

<img file="MX359598B_D0003.tif" />

Original string:

NAHANNY MARISOL CANAL REYES | 00001000000403252793 | Administration Service

Tax | 1695 || MX / 201B / 84124 | MX / a / 2016/009686 | Normal patent title with divisional PCT | 1220 | RRGO | Page (s) | Oxri6NK3HRnsuDW MgC7VYMibd4t =

Digital stamp:

DWAXoJLR0y7moZHasx97mtJ1DDVg2O26pEITyQbnFadmPlw9Vewn / Tocf6zO5D8s2seipNku / MT / u + + jjLLaC 6ADYtzGLtSDsPIFZs9mjNEIDLZyE4S¡BwC6tOoQPhWOvJE9h7CzDRUTAcNRXoOoVCotef27KLzbZLvqfCh7alKdRbO p7IMk 7kN4YjyOKdB7KTuUnOvr9V7MLT1r90z3 / s14WkmtoLgzyWOYeKBZ4n5TdAYGIT6tTD6Q7su / YurbQr5LB8u2UX.mCJw lrZMvxpSIYIZ q2wLMy5gPZ76hHhCEocOf3fuOCPHJJ4S4bOI6kLs3Sexrc + + == RghRCwTC5DVg

/.renal No. 550, Piso i, Pueblo Sania María Tepepan, XachiiTiiiixs, 16020. Mexico City &lt;w gob.mx/iiTipi

<img file="MX359598B_D0004.tif" />

<img file="MX359598B_D0005.tif" />

351388 wdxiWl

IMPROVED LIMIT NECKLACE

IMPI

INSTITUTO MEXICANO DELAERONEDAD INDUSTRIAL

<img file="MX359598B_D0006.tif" />

FIELD OF THE INVENTION

The present invention relates to the well drilling field, and more particularly to a boundary collar and methods.

<img file="MX359598B_D0007.tif" />

to use it.

BACKGROUND OF THE INVENTION

Wells are sometimes drilled into underground hydrocarbon-containing formations to allow for oil recovery. Some well service methods employ well tubes that are lowered into the well for different purposes throughout the life of the well. Different components can be placed on the outer surface of a downhole tubular to achieve a variety of effects during drilling, completion, and service operations. For example, centralizers can be used to keep well tubulars aligned within the well as wells are generally not perfectly vertical. The alignment can help prevent any friction between the downhole tubular and the side of the downhole or casing wall, potentially reducing any damage that might occur. Common components placed around a tubular well

IMPIOS

MEXICAN INSTITUTE _n OWNERSHIP 0hx¿®í ^^ iNWtSTRiAL use limit collars, which, also · -are called stop collars or limit clamps, located at either end of the components to maintain the positioning of the component with respect to the tubular of well as the tubular is transported in and out of the well. The different components can be free to move within the limits of the limit collars. Traditional limit collars use one or more setscrews that pass through a metal stop collar and make contact with the down tube to attach the stop collar to the tube. The use of set screws provides a limited amount of holding force, thereby limiting the force that the stop collar can withstand.

BRIEF DESCRIPTION OF THE INVENTION

Disclosed in this document is a boundary collar comprising a boundary component coupled to a surface of a downhole tubular; and an interface component that couples the boundary component. An edge of the boundary component can be tapered. The interface component may comprise at least one material selected from the group consisting of: a metal, an alloy, a compound, a ceramic, and any combination thereof. The component of

IMPI Mexican institute

OF THE PROPERTY

INDUSTRIAL

<img file="MX359598B_D0008.tif" />

The interface may comprise an extension H7 ”OT '' 'to &lt;5fldé aT ~ ffi6! R&gt; s a surface of the extension is coupled to the boundary component. The extension may comprise a lateral extension. The extension may comprise a longitudinal extension of a fibrous material. The extension may comprise a surface feature selected from the group consisting of: a boss, a hole, a surface corrugation, a surface stipple, and a surface roughness. The limit collar may comprise a plurality of portions, and wherein each portion does not extend around the perimeter of the wellbore. The limit collar may also comprise one or more grooves that are formed between adjacent portions. The limit collar may also include a plurality of interface components that engage the limit component.

Also disclosed herein is a method comprising: providing a limit collar placed in a well tubular and a first component slidably coupled to the well tubular, wherein the limit collar comprises: a limit component coupled to a well tubular surface; and an interface component that couples the boundary component; transporting the well tubular into a well, where the first component refers to the well tubular due to the coupling of the

<img file="MX359598B_D0009.tif" />

first component with boundary component the interface component. It may comprise a material selected from the group consisting of: a compound, a ceramic, a resin, an epoxy, a polymer, a metal, an alloy, or any combination thereof. The boundary component may comprise a polymer, and the polymer may comprise a crosslinked polymer, a polyolefin, a crosslinked polyolefin, or any combination thereof. The boundary component may comprise a metal, and the metal may be selected from the group consisting of: iron, chromium, nickel, molybdenum, tungsten, titanium, niobium, manganese, silicon, vanadium, combinations thereof, and alloys thereof. themselves. The interface component may comprise a material with a higher compressive strength than that of a material used to form the boundary component. The component

<td>interface</td><td colspan="3">can comprise an extension comprising</td><td>a</td>

<td>surface</td><td>of</td><td colspan="2">shear force transfer, and</td><td>a</td>

<td>surface</td><td>of</td><td>transfer</td><td>compression load.</td><td>The</td>

<td>component</td><td>of</td><td>interface can</td><td>understand an extension</td><td>than</td>

<td>understands</td><td>a</td><td>surface of</td><td>force transfer</td><td>of</td>

<td>cutting,</td><td>a</td><td>surface of</td><td>load transfer</td><td>of</td>

<td>compression,</td><td>and</td><td>a surface</td><td>load transfer</td><td>of</td>

tension. The interface component may comprise a

<img file="MX359598B_D0010.tif" />

surface area of

<img file="MX359598B_D0011.tif" />

extension comprising a full charge transfer, wherein a first portion of the total charge transfer surface area comprises a compression charge transfer surface, and wherein a second portion of the total surface area comprises a transfer charge surface shear load. The limit collar may also include a plurality of interface components that engage the limit component.

Also disclosed herein is a method comprising: providing a tubular well; and forming a limit collar on a first surface portion of the wellbore, where the limit collar comprises: a

<td>component</td><td>of</td><td>limit</td><td>coupled to the first</td><td>portion</td><td>of</td>

<td>surface</td><td>of the</td><td>tubular</td><td>well; and a component</td><td colspan="2">interface</td>

<td>what couples</td><td>the</td><td colspan="2">boundary component. To form a</td><td>necklace</td><td>of</td>

Boundary on the first surface portion may comprise: placing a mold around the interface component and the first surface portion; and injecting a composite material into a space between the mold and the first surface portion to form the boundary component. Forming a boundary collar on the first surface portion may also comprise: placing a polymer material around the interface component and the first

IMPI

<img file="MX359598B_D0012.tif" />

surface portion; and shrinking the polymer material to form the boundary collar by applying heat to the polymer. Forming a limit collar at the first surface portion may further comprise: thermally spraying a composition comprising a metal onto the first surface portion and the interface component to form the limit collar.

These and other features of the present invention will be more clearly understood from the detailed description below taken in conjunction with the accompanying drawings and claims.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present invention and its advantages, reference is now made to the following brief description, taken in conjunction with the accompanying drawings and detailed description:

FIG. 1 is a sectional view of one embodiment of a well service system in accordance with one embodiment of the present invention.

Figure 2 is a cross-sectional view of a limit collar in accordance with an embodiment of the present invention.

<img file="MX359598B_D0013.tif" />

IMPI

-7 MEXICAN INSTITUTE 'r * LAP »O» ltDAI&gt;

INDUSTRIAL

Figure 3 is a cross-sectional view of a limit collar in accordance with another embodiment of the present invention.

Figures 4A-4E are isometric views of a limit collar in accordance with still other embodiments of the present invention.

Figures 5A and 5B are cross-sectional views of a limit collar in accordance with still other embodiments of the present invention.

Figure 6 is a cross sectional view of a limit collar in accordance with another embodiment of the present invention.

Figures 7A-7D are isometric views of a limit collar in accordance with still other embodiments of the present invention.

Figure 8 is a cross-sectional view of a limit collar placed within a well in accordance with an embodiment of the present invention.

Figure 9 is a plan view of a limit collar in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

In the drawings and the description that follows, similar parts are typically marked throughout the specification and drawings with de

IMPI

MEXICAN INSTITUTE

I »LA rROHEUAP. „INTRISTRIAL VS

<img file="MX359598B_D0014.tif" />

lno πιιπηιηπ ni&gt; Arns ........

reference, respectively. The figures in the drawings are not necessarily the scale. Certain features of the invention may be shown exaggerated in scale or in some schematic way and some details of conventional elements may not be shown in the interest of clarity and conciseness.

Unless otherwise specified, the use of any form of the terms connect, couple, join, or any other term that describes an interaction between elements does not mean that it limits the interaction to the direct interaction between the elements and may also include the indirect interaction between the elements described. In the following discussion and in the claims, the terms it includes and includes are used in an open way, and therefore should be interpreted to mean that it includes, but is not limited to .... Reference to above or below shall be made for description purposes with up, top, up, or upstream meaning towards the well surface and with down, bottom, down, or downstream meaning towards the terminal end of the well, without import the orientation of the well. The different characteristics mentioned above, as well as others

IMPI

<img file="MX359598B_D0015.tif" />

characteristics described in greater detail 1 to mag. adolanto_t They will be readily apparent to those skilled in the art with the help of this disclosure by reading the following detailed description of the modalities, and by reference to the accompanying drawings.

Referring to Figure 1, an example of a well operating environment is shown. As depicted, the operating environment comprises drill rig 106 that is positioned on the surface of the earth 104 and extends over and around a well 114 that penetrates an underground formation 102 for the purpose of recovering hydrocarbons. Well 114 can be drilled into underground formation 102 using any suitable drilling technique. Well 114 extends substantially vertically away from land surface 104 over a vertical well portion 116, deviates from vertical with respect to land surface 104 over a deviated well portion 136, and transitions to a horizontal wellbore 118. In alternative operating environments, all or portions of a wellbore may be vertical,

<td>deflected</td><td>in</td><td colspan="2">any angle</td><td colspan="2">suitable, horizontal,</td><td>me</td>

<td>curved.</td><td>The</td><td>water well</td><td colspan="2">it can be a new well, a well</td><td colspan="2">existing,</td>

<td>a well</td><td colspan="2">straight,</td><td>a well of</td><td>extended reach,</td><td>, a</td><td>water well</td>

<td>deflected,</td><td>a</td><td>water well</td><td>multilateral,</td><td>and other types of</td><td>wells</td><td>for</td>

<img file="MX359598B_D0016.tif" />

IMPI drill and complete one or more »production zones and • In addition, the well can be used for both production wells and injection wells.

A tubular well chain 12 0 comprising a limit collar 200 can be lowered into the underground formation 102 for a variety of repair or treatment procedures throughout the life of the well. The embodiment shown in Figure 1 illustrates the tubular well 120 in the form of a casing chain that is lowered into the underground formation with the limit collar retaining a centralizer 122. It should be understood that the well tubular 120 comprising a limit collar 200 is equally applicable to any type of well tubular that is inserted into a well, including as non-limiting examples drill pipe, production pipe, bar chains , and flexible tubing. Limit collar 200 can also be used to retain one or more components in other different tubular devices and / or in-hole tools (eg, submersible and in-hole repair tools). In the embodiment shown in Figure 1, the well tubular 120 comprising the limit collar 200 is transported into the underground formation 102 in a conventional manner and can subsequently be secured within the well 114 by filling

IMPI

<img file="MX359598B_D0017.tif" />

with cement a ring 112 between the · fewbwlag · dc-ppge · 12friy the well 114.

Drill rig 106 comprises a drill rig 108 with a drill deck 110 through which wellbore tubular 120 extends downward from drill rig 106 into well 114. Drill rig 106 comprises a winch powered by a motor and other associated equipment to extend casing chain 120 into well 114 to position well tubular 120 at a selected depth. While the operating environment depicted in Figure 1 refers to a stationary drill rig 106 for lowering and setting up the tubular well 120 comprising the limit collar 200 within a ground-based well 114, in alternative modes, mobile repair kits, well service units (such as coiled tubing units), and the like can be used to lower the well tubular 120 comprising the limit collar 200 into a well. It should be understood that a well tubular 120 comprising the limit collar 200 can alternatively be used in other operational environments, such as within an offshore well operational environment.

In alternative operating environments, a vertical, diverter, or horizontal well portion may be lined

IMPI

<img file="MX359598B_D0018.tif" />

and cemented and / or portions of the well may be dlll IUVIüjLiír For example, the uncoated section 140 may comprise a section of the well 114 ready to be lined with the well tubular 120. In one embodiment, a limit collar 200 may be used in production pipeline in a lined or uncoated well. In one embodiment, a portion of well 114 may comprise a widened section. As used herein, widening refers to the enlargement of an existing well below an existing section which may be lined in some ways. A widened section may have a larger diameter than an upward section of the widened section. Therefore, a downhole tubular passing through the well can pass through a smaller diameter pitch followed by a larger diameter pitch.

Regardless of the type of operational environment in which limit collar 200 is used, it will be appreciated that limit collar 200 to limit longitudinal movement and / or retain one or more components placed around the wellbore. In one embodiment, a plurality of limit collars 200 can be used to limit and / or retain one or more components around a tubular well. In one embodiment, limit collar 200 can serve as a guide or centralizer without the aid of any additional components.

<img file="MX359598B_D0019.tif" />

IMPI

As described in greater detail below with γα ^ γί-π _toFIG. 2, limit collar 200 comprises a limit component 202 that couples an interface component 204, both of which are placed in a tubular well 206. In one embodiment, limit collar 200 may comprise a plurality of interface components 204 positioned at the ends of limit collar 200 and mating to an interface component 204 between interface components 204. In one embodiment, the limit collar 200 described herein can be used to hold one or more components in the well tubular 12 0 as such one or more components pass through small tolerance constraints within well 114. In one embodiment, the limit collar 200 described herein can be used in small tolerance wells through which traditional stop collars would not pass.

Referring now to Figure 2, one embodiment is shown in cross section of the limit collar 200 placed in a tubular well 206. As described above, the limit collar 200 comprises a limit component 202 that engages an interface of component 204. Boundary component 202 may generally comprise a material that engages, and / or attaches to downhole tubular 206. In one embodiment, boundary component 202

<img file="MX359598B_D0020.tif" />

IMPI can provide most of the outside-display shown by limit collar 200. Interface component 204 can engage limit component 202 and prevent point loading of a force applied directly to limit component 202. By distributing an applied load to limit component 202 through interface component 204, the point load and resulting potential failure of limit component 202 can be reduced or avoided, thereby improving the load capacity of limit collar 200 .

Boundary component 202 may comprise any material that couples, and / or joins, to tubular wellbore 2 06 by forming a chemical and / or mechanical bond. In one embodiment, boundary component 202 may be attached to well tubular 206 through contact area 208 between boundary component 202 and well tubular 206. In one embodiment, boundary component 202 can include, but is not limited to, a compound, a ceramic, a resin, an epoxy, a polymer, a metal, an alloy, or any combination thereof. Boundary component 202 can be positioned and / or attached to well tubular 2 06 using any known technique to apply the desired material. For example, you can use a method of flame spraying, spraying, confusion welding, brazing,

IMPI

MEXICAN INSTITUTE OF THE DA EDAi INDUSTRIAL

<img file="MX359598B_D0021.tif" />

diffusion bonding, casting, casting — curing, or any combination thereof to apply boundary component 202 to downhole tubular 2 06, as discussed in greater detail below. Boundary component 202 may be positioned and / or generally attached to downhole tubular 206 as a generally cylindrical layer, although the shape of boundary component 202 may be varied based, at least in part, on the shape of downhole tubular 206. In one embodiment, limit collar 200 comprising limit component 202 can be positioned and / or attached to well tube 206 as one or more portions or patches that can provide one or more longitudinal grooves or flow channels, as described in more detail later. Additional suitable forms of boundary component 202 are discussed in greater detail below. In one embodiment, the edges 214 of the limit component 202 may be tapered or angled to aid in movement of the limit collar 200 through the well (eg, through a small tolerance constraint). In one embodiment, tapered or angled edge 214 is a leading edge in a direction of travel of wellbore tubular 206 within the wellbore (eg, a leading edge into the wellbore as the tubular runs into the wellbore ).

• mm. * * '* «· ♦ w

IMPI

MEXlCANl INSTITUTE

OF INDUSTRIAL PROPERTY

<img file="MX359598B_D0022.tif" />

The boundary component 202 del-'geill'ai¹ Jt = Í TfnrtCg ^ OO may comprise one or more composite materials. A composite material comprises a heterogeneous combination of two or more components that differ in shape or composition on a macroscopic scale. While the composite may demand characteristics that no single component possesses on its own, the components retain their unique physical and chemical identities within the composite. Composite materials can include a reinforcing agent and a matrix material. In a fiber-based compound, the fibers act as the reinforcing agent. The matrix material can act to keep the fibers in a desired location and orientation and also serve as a means of charge transfer between the fibers within the composite. The matrix material may also act to bond the composite material to the surface of the well tube 206, thereby forming the chemical and / or mechanical bond between the boundary component 202 and the well tube 206.

The matrix material can comprise a resin component, which can be used to form a resin matrix. Suitable resin matrix materials that can be used in the composites described herein can include, but are not limited to, thermosetting resins including orthophthalic polyesters,

IMPI

MEXICAN INSTITUTE

Say LA PSOHEDAC

INDUSTRIAL

<img file="MX359598B_D0023.tif" />

isophthalic polyesters, 'Llpu rt'áll'ó ^' áTmaTei'cbs polyesters, vinyl esters, thermoset deposits, phenolics, cyanates, bismaleimides, end cap encapsulated sodium polyimides (eg, PMR-15), and any combination of the same. Additional resin matrix materials can include thermoplastic resins including polysulfones, polyamides, polycarbonates, polyphenylene oxides, polysulfides, polyether ether ketones, polyether sulfones, polyamide-imides, polyetherimides, polyimides, polyarylates, liquid crystalline polyester, and any combination of the themselves.

In one embodiment, the matrix material can comprise a two-component resin composition. Suitable two-component resin materials can include a curable resin and a hardening agent that, when combined, reacts to form a cured resin matrix material.

Suitable curable resins that can be used include, but are not limited to, organic resins such as bisphenol A diglycidyl ether resins, glycidyl butyl butoxymethyl ether resins, bisphenol A-epichlorohydrin resins, bisphenol F resins, polyepoxide, novolac resins, polyester resins, phenol-aldehyde resins, urea-aldehyde resins, furan resins, urethane resins, glycidyl ether resins, w

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<img file="MX359598B_D0024.tif" />

MEXICAN INSTITUTE OF INDUSTRIAL PROBITY

<img file="MX359598B_D0025.tif" />

other epoxy resins, and any comhinaniAn Ha loa above. Suitable hardening agents that can be used include, but are not limited to, cycloaliphatic amines, aromatic amines; aliphatic amines; imidazole; pyrazole; pyrazine; pyrimidine; pyridazine; IHindazol; purine; phthalazine; naphthyridine; quinoxaline; quinazoline; phenazine; imidazolidine; cinolin; imidazoline; 1,3,5-triazine; thiazole; pteridine; indazole, - amines; polyamines; amides; polyamides; 2-ethyl-4-methyl-imidazole; and any combination thereof. In one embodiment, one or more additional components can be added to the matrix material to affect the properties of the matrix material. For example, one or more elastomeric components (eg, nitrile rubber) can be added to increase the flexibility of the resulting matrix material.

Fibers can lend their characteristic properties, including their strength-related properties, to the compound. Fibers useful in composites that are used for limit component 202 of limit collar 200 can include, but are not limited to, glass fibers (eg, e-glass, A-glass, E-CR-glass , C-glass, D-glass, R-glass, and / or S-glass), cellulosic fibers (eg, viscose rayon, cotton, etc.), carbon fibers, graphite fibers, metal fibers ( e.g.,

IMPI

<img file="MX359598B_D0026.tif" />

steel, aluminum, etc.), ceramic fibers, aramid fibers, and the same.

ceramics, fibers »· mofeáliiaas any combination of

The strength of the interface between the fibers and the matrix material can be modified or improved through the use of a surface coating agent. The surface coating agent can provide a physical-chemical bond between the fiber and the resin matrix material, and therefore can have an impact on the mechanical and chemical properties of the final compound. The surface coating agent can be applied to the fibers during their manufacture or at any other time before the formation of the composite material. Suitable surface coating agents can include, but are not limited to, surfactants, anti-static agents, lubricants, silazan, siloxanes, alkoxysilanes, aminosilanes, silanols, polyvinyl alcohol, and any combination thereof.

In one embodiment, boundary component 2 02 may comprise a ceramic-based resin that includes, but is not limited to, the types disclosed in US Patent Application Publication No. US 2005/0224123 Al Entitled Integral Centraliser, and published on October 13,

IMPI

MEXICAN INSTITUTE

FROM Ϊ.Α PROPIRDAP

INDUSTRIAL

<img file="MX359598B_D0027.tif" />

2005, and US 2007/0131414 Al, intituLadU ”^ MfciLhÍJd — ft) T Making Centralizers for Centralizing a Tight Fitting Casing in a Borehole, and published on June 2007, both of which are incorporated herein by reference in their entirety. For example, in some embodiments, the resin material can include bonding agents such as an adhesive or other curable components. In some embodiments, components to be mixed with the resin material may include a hardener, an accelerator, or a cure initiator. In addition, in some embodiments, a ceramic-based resin composite may comprise a catalyst to initiate cure of the ceramic based on the resin composite. The catalyst can be thermally activated. Alternatively, the mixed materials of the composite material can be chemically activated by a cure initiator. More specifically, in some embodiments, the composite material comprising a curable resin and ceramic particle filler materials, optionally including chopped carbon fiber materials. In some embodiments, a resin composite may be characterized by high mechanical strength, a high degree of surface adhesion, and resistance to • ΙΜ

IMPI

MEXICAN INSTITUTE OF INDUSTRIAL PROPERTY

<img file="MX359598B_D0028.tif" />

friction abrasion.

In one embodiment, limit component 202 of limit collar 200 can comprise a polymer. The polymer can be provided in the form of tape, wrap, sleeve,

<td colspan="2">foil, fiber,</td><td>and / or a fibrous material</td><td>than</td><td>can be placed</td>

<td>around</td><td>of the</td><td>tubular well 206.</td><td>The</td><td>polymer can</td>

<td>understand</td><td>a</td><td>crosslinked polymer,</td><td>a</td><td>polyolefin, a</td>

crosslinked polyolefin, any combination thereof. The use of a crosslinked polymer such as a crosslinked polyolefin can allow the crosslinked polymer to contract with the application of heat. Crosslinking can be imparted to the polymer by any method known in the art including, but not limited to, irradiation and / or the incorporation of chemical crosslinking agents.

In one embodiment, the polymer comprises a crosslinked polyolefin and / or polyolefin which, in one embodiment, can be shrunk with heating. As used herein, the term polyolefin generally describes a polymer produced from a single olefin, such as an alkene with the general formula C_nH2n, as a monomer. A polyolefin can include, but is not limited to, polyethylene, polypropylene, any combination thereof, and any mixture thereof. Polypropylene can include polymers with different molecular weights,

<img file="MX359598B_D0029.tif" />

<img file="MX359598B_D0030.tif" />

IMPI

MEXICAN INSTITUTE OF INDUSTRIAL PROPERTY

<img file="MX359598B_D0031.tif" />

densities and tacticities synthesized by diyt-.iv _s propylene.

Polyethylene can include polymers made by polymerization of ethylene. For example, polyethylene can include polymers of ethylene polymerized by free radical polymerization. For example, polyethylene can have a high degree of short long chain branching.

Polyethylene may also include copolymers of ethylene and a comonomer alpha olefin made by means of a single site catalyzed reaction (eg, by means of a catalyzed metallocene reaction) or a mixture thereof with an elastomer or polyethylene high pressure and low density. Polyethylene can include copolymers made with different alpha olefin monomers including

1-butene, 3-methyl-l-butene, 3-methyl-l-pentene,

1-hexene,

4-methi1-1-pentene,

3-methyl-lhexene, 1-octene or 1-decene.

While reference is made in this document to specific polymer compositions, one skilled in the art will appreciate that polymers or polymer blends with substantially equivalent physical properties could be substituted, still being within the scope and spirit of the present disclosure.

In one embodiment, an adhesive with the polymer can be used to assist in bonding the polymer to the wellbore. As used in this document, the term

IMPI

<img file="MX359598B_D0032.tif" />

adhesive includes those known materials 5h l'á matter¹as stickers. The adhesive may include, but is not limited to, compatible sealants, hot melt polymers, epoxies, polyurethanes, polyimides, synthetic rubbers, or other suitable adhesive materials. The adhesive can be placed as a layer between the polymer and the well tube 206 and can assist in the long-term bonding of the polymer to the well tube 206.

In one embodiment, limit component 202 of limit collar 200 can be formed from one or more metals and / or alloys, and in some embodiments can be formed as a composite with a matrix phase comprising one or more metals and / or alloys. Suitable metals can include, but are not limited to, iron, chromium, nickel, molybdenum, tungsten, titanium, niobium, manganese, silicon, vanadium, combinations thereof, and alloys thereof. Additional suitable materials can be included in said one or more metals and / or alloys including carbon, boron, and different ceramics. In one embodiment, boundary component 202 may comprise a carbon / boron / chromium steel matrix containing carbide and chromium boride particles, and may include additional alloying elements that act as matrix builders, such as nickel, molybdenum , tungsten, and titanium. In an i Μ Ρ1

<img file="MX359598B_D0033.tif" />

In the embodiment, the boundary component 202 may have a metal component having a composition comprising iron and a carbon content of approximately 0.40 approximately 2.5 weight percent (wt.%); a chrome content of about 4.0 about 35 wt. %; a chrome content of about 3.5 about 10.0 wt. %; A nickel content of approximately 0.0 approximately 2.0 wt. %, - a niobium content of about 0.0 to about 2.5 wt. %; a manganese content of about 1.0 to about 3.5 wt. %; a silicon content of about 0.0 to about 2.5 wt. %; a titanium content of about 0.0 to about 2.0 wt. %; a vanadium content of about 0.0 to about 2.0 wt. %; and a tungsten content of about 0.0 to about 2.5 wt. %. Iron (Fe) comprises the remaining element for the weight balance listed above. A zero percentage for the lower weight range indicates a percentage where no intended addition of the element would be present, although some trace amounts can be detected. The composition may have a range of microstructures including, but not limited to, martensitic with a relatively high density of carbides and borides, hyper-eutectic carbides or borides in

IMPI

<img file="MX359598B_D0034.tif" />

an eutectic matrix, and combinations of Ing

The length 218 of the boundary component 2 02 can be chosen to provide a sufficient holding force for the boundary collar 200. When the boundary component 202 is in place and / or attached to the well tube 206, a mechanical joint can be formed and / or chemistry on the surface

208. Consequently, the length provide a surface area

218 can be chosen for which chemistry can act to provide a strength of the mechanical bond and / or

<td colspan="3">full retention on or by</td>

<td>modality,</td><td>the force</td><td>of</td>

<td colspan="2">exceed a capacity</td><td>or</td>

<td>necklace of</td><td>limit 200.</td><td>The</td>

the union of the desired level can act on it. In a full hold it can meet or load specification for the surface area over which mechanical and / or chemical can be determined at least in part based on the length 218 and the diameter of the well tubular 206 at the surface 208. Any surface treatment of downhole tubular 206 and / or interface component 204 can be considered when determining the length 218 of boundary component 202 and / or the mechanical and / or chemical bond strength at the surface

208.

Interface component 204 generally acts as a force transferring element or means between a component 222 that is retained in well tube 206 and the

IMPI

MEXICAN INSTITUTE OF INDUSTRIAL PROPERTY

<img file="MX359598B_D0035.tif" />

boundary component 2 02. In the absenceⁱof't^,-'C0mponeiiLEÍ Tl'e interface 204, the limit component 202 may be subject to failure due to the point load of the limit component 202. As used herein, the term point load may refer to the application of a forces a component over less than 20% of the surface area available for loading. With respect to a compressive force applied in a longitudinal direction along the shaft tubular 206, the surface available for loading at the boundary component 202 may correspond to the cross-sectional area of ​​the surface 210 in a plane normal to the axis longitudinal of the tubular well 206. Failure of limit component 202 under point load conditions in the absence of an interface component 204 can result when the compressive strength of limit component 202 is exceeded at the point and / or load area before the shear strength of the chemical and / or mechanical bond that forms on surface 208 between boundary component 202 and downhole tubular 206. The use of an interface component 204 to reduce or eliminate the point load on the limit component 202 can allow the limit collar 200 to support and / or resist higher forces or loads without failure. In one embodiment, interface component 204 can provide connection area for

<img file="MX359598B_D0036.tif" />

MEXICAN INSTITUTE BE THE INDUSTRIAL PROPERTY

<img file="MX359598B_D0037.tif" />

applying a load to at least about 70%, alternatively at least about 80%, alternatively at least about 90%, alternatively at least about 95% of the surface area of ​​surface 210. In one embodiment, the interface component 204 can provide contact area over substantially the entire surface area of ​​surface 210.

In one embodiment, use of interface component 204 can allow limit collar 200 to support and / or resist increased forces or loads without failure compared to using limit component 202 without interface component 204. In one embodiment, limit collar 200 comprising interface component 204 can withstand an applied load or force of at least 20%, 40%, 60%, 80%, or 100% more than the load or force that can be retained using a limit collar without interface component 204 (eg, using limit component 202 alone).

Interface component 204 can comprise any material that has adequate compressive strength to resist failure due to point loading of a component 222 that applies a force (eg, a compressive force or tension) to the interface component. 204. In one embodiment, interface component 204 can have a

<img file="MX359598B_D0038.tif" />

IMPI compressive strength greater than] a -rp.qi "ι- απι-ί a._a — The compression of the material or materials that form the boundary component 202. In one embodiment, the interface component 204 may comprise a more material ductile than the material or materials that form the boundary component 202. Increased utility may allow interface component 204 to deform to some degree in response to a point load, thereby increasing the contact area and decreasing the pressure applied to surface 212 between interface component 204 and component 222 which it is retained in the tubular well 206. Increased utility may also allow interface component 204 to deform to some degree in response to a point load, thereby increasing the contact area and decreasing the pressure applied to surface 210 between interface component 204 and component limit 202. In one embodiment, interface component 204 may be formed of a material suitable for machining. For example, the interface component may have threads or other connection means formed therein. Suitable materials to form the interface component may include, but are not limited to, metals (eg, steel, aluminum, etc.), alloys (eg, alloys containing steel and / or aluminum), compounds (eg, compounds containing steel and / or aluminum,

IMP mexican institute of industry www!

<img file="MX359598B_D0039.tif" />

It comprises lu¡ =&gt; "HE 'poi Imero, resin compounds, carbon fiber composites, etc.)., ceramics, any combination thereof, and other high-strength materials. In one embodiment, interface component 204 may have adequate compressive strength to withstand a compression load of more than about 222 kN (50,000 lb force (lbf)), 266 kN (60,000 lbf), about 333 kN (75,000 lbf), approximately 444 kN (100,000 lbf), approximately 556 kN (125,000 lbf), or alternatively approximately 667 kN (150,000 lbf). The ability of interface component 204 to withstand a compressive load may depend on the compressive strength of the material or materials that make up interface component 204 along with the geometry of interface component 204 (eg, the area of cross section on which force is applied).

The length 220 of the interface component 204 can be chosen to provide a sufficient load distribution over the limit component 202. When a force is applied to the interface component 204, the force can be transmitted through the interface component 204 to the component limit 202. Length 220 interface component 204 may affect, at least in part, the mechanical properties of interface component 204. For

IMPI

<img file="MX359598B_D0040.tif" />

MBX1CANG INSTITUTE

INDUSTRIAL example, length 220 may affect deflection of interface component 204 when a point load is applied to surface 212 of interface component 204. The resulting deflection may then apply uneven load to limit component 202. The choice of length 220 of interface component 204 may depend, at least in part, on the material or materials that make up interface component 204, the thickness 216 of interface component 204, the material or materials that make up the boundary component. 202, the shape and orientation of interface 210, and the shape and orientation of interface 212.

The surface 212 can take any form capable of providing a contact area for applying a load on the interface component 204 when a component 222 to be retained in the tubular well 206 engages the interface component 204. In one embodiment, the surface 212 may comprise a substantially flat surface. In one embodiment, the flat surface may be aligned with a plane normal to the longitudinal axis of downhole tubular 206. This alignment may allow a force to be applied from one or more components 222 retained in the well tube 206 to the interface component 204 in a substantially longitudinal direction. In one embodiment, an edge of a component that mates with surface 212 at the

<img file="MX359598B_D0041.tif" />

IMPI interface component can tint a _t surface-ici-e— substantially flat. The interaction between the two flat surfaces can provide a relatively uniform load on the interface component 204. In one embodiment, the surface 212 can take other forms. In one embodiment, surface 212 may comprise a complementary and / or mirrored surface with respect to the surface of component 222 that can be coupled to surface 212. For example, one or more grooves, voids, protrusions, or other aligning means can be formed on surface 212, and corresponding features can be formed on the surface of component 222 that can be attached to surface 212. Such structures can assist in aligning a component, which may comprise corresponding features on the interface, with interface component 204.

The interface 210 between the boundary component 202 and the interface component 204 can take any form capable of providing a contact area to apply a load on the cross-sectional area of ​​the boundary component 202. In one embodiment, interface 210 can understand a substantially flat interface. In one embodiment, the flat interface may be aligned with a plane normal to the longitudinal axis of the wellbore tube 206. This alignment may

IMPI

MEXiCANC INSTITUTE

O 7 OCLA PtOTiíDAE Cp ^ wZd &amp; UíFÁ⁴'° (NOurnuAL allow the application of a force ΗρβΗρ ρητηρηηρη ^ Α Has interface 204 to the boundary component 202 in a substantially longitudinal direction. In one embodiment, interface 210 may have an irregular shape. In one embodiment, the surface of the component of Boundary 202 at interface 210 may comprise a complementary and / or mirrored surface with respect to the surface of interface component 204 at interface 210. In one embodiment, the surface of boundary component 202 at interface 210 may comprise a locking and / or mating surface relative to the surface of interface component 204 at interface 210. In one embodiment, interface component 2 04 and the boundary component 202 can have the same thickness 216. In other embodiments, the interface component 204 and the boundary component 202 can have different thicknesses. When interface component 204 and boundary component 202 have different thicknesses, an edge of boundary component 202 and / or an edge of interface component 204 can be beveled, angled, or in some other way to provide a smooth and / or rounded between interface component 204 and boundary component 202.

In one embodiment, interface component 2 04 may comprise one or more extensions 302. Said one or more

<img file="MX359598B_D0042.tif" />

IMPI extensions 3 02 can provide structural strength 'to limit collar 200 and / or aid in the distribution of applied force along the length of limit component 202. In one embodiment, extension 302 can be placed with a surface in contact with the well tubular 2 06 in such a way that the boundary component is not placed between the extension 302 and the well tubular 206. In one embodiment, extension 302 may be connected to a surface on the outermost surface of boundary component 202 such that boundary component 202 is fully positioned between extension 302 and downhole tubular 206. In an embodiment as illustrated in the cross-sectional view of Figure 3, extension 302 may be positioned between the boundary component such that at least two surfaces 304, 306 are in contact with boundary component 202. While the rest of the discussion may refer to the modality illustrated in Figure 3, the concepts applicable when extension 302 has two surfaces 304, 306 in contact with boundary component 202, may also apply when only one of surfaces 304, 306 are in contact with boundary component 202.

Boundary component 202 can form a mechanical and / or chemical bond with one or more of surfaces 304,

<img file="MX359598B_D0043.tif" />

IMPI Mexican INSTITUTE OF PROPERTY 3 4 INDUSTRIAL

306, 308 of extension 302 positioned at lumpuiieiim 'flg limit 202. Surfaces 304, 306 may generally extend in a longitudinal direction (eg, generally parallel to the surface of the wellbore). In one embodiment, surfaces 304, 306 may not be parallel to the surface of downhole tubular 206, but rather may extend at any angle that still allows surface 304 and / or surface 306 to remain in contact with the component. Boundary 202. Surface 308 can generally extend in a radial direction (eg, generally perpendicular to the surface of well tube 206). In one embodiment, the surface 308 may not be perpendicular to the surface of the well tube 206, but may rather extend at any angle and / or be curved (eg, rounded), angled, or in some other way : When a longitudinal load is applied to interface component 204, surfaces 304, 306 can generally transfer applied force to limit component 202 through the application of a shear force on surfaces 302, 304. In the same way, surface 308 can generally transfer a force applied to limit component 202 through the application of a compressive and / or tensile force on surface 308 when a longitudinal load is applied to the

<img file="MX359598B_D0044.tif" />

IMPI interface component 204. Based on the types of load transfer surfaces, extension 302 can be described as comprising at least one shear force transfer surface and at least one compression load transfer surface and / or or tension. In one embodiment, a single angled and / or curved surface may comprise a shear force transfer surface section and a compression and / or stress load transfer surface section. In one embodiment, the shape, available contact area, and material selection of extension 302 and limit component 202 can be chosen to provide a desired load profile over the length of limit component 202.

In one embodiment, interface component 204 and said one or more extensions 3 02 may comprise a single integral component. For example, interface component 204 with said one or more extensions 302 may be a machined component formed from a single piece of machinable material (eg, a metal such as aluminum exists. In one embodiment, said one or more extensions 302 can be separate components that can be attached to interface component 204 before or during the arrangement of interface component 204 on well tube 206.

IMPI

MEXICAN INSTITUTE OF INDUSTRIAL PROPERTY

<img file="MX359598B_D0045.tif" />

As shown in Figures 4A to 4E. Ha Αχτρη ^ ήπτη?

It can understand different ways. Boundary component 202 is shown in dotted lines in Figures 4A to 4E to better illustrate extension 302. As shown in Figure 4A, extension 302 can take the form of one or more longitudinal extensions. Extensions 302 can be generally rectangular, although end 402 and edge 404 can be curved, rounded, smoothed, and / or comprise one or more features to engage limit component 202. Features suitable for coupling to boundary component 202 may include, but are not limited to, one or more protrusions, gaps, and / or surface roughness on a macroscopic and / or microscopic scale.

As shown in Figure 4B, when a plurality of extensions 302 are present, each extension may be the same length or the extensions 302 may have different lengths. While extensions 302 of Figure 4B are illustrated with two alternate lengths, any number of different lengths can be used, and the lengths of adjacent extensions 302 can be varied or are approximately the same.

As shown in Figure 4C, extensions 302 can comprise shapes other than rectangular. As an example, extensions 302 can comprise one or more

IMPI

MEXICAN INSTITUTE

DI UA «QMÍDAD industrial

<img file="MX359598B_D0046.tif" />

side extensions 406. In one embodiment, extensions 302 may be arrow-shaped, T-shaped, L-shaped, J-shaped, or any other shape, one or more side extensions 406. Side extensions 406 can provide a plurality of compression and / or tension load transfer surfaces. For example, surfaces 408, 410 can act to transfer compression loads and / or stress from interface component 204 through extension 3 02 and side extension 406, to limit component 202. When a compression load is placed longitudinal (that is, a load from the interface component to the boundary component) on interface component 204, surface 408 may be in compression while surface 410 may be in tension. Conversely, when the longitudinal stress load (i.e., a load from the interface component is pulled by pulling the limit component) onto interface component 204, surface 408 may be under tension while surface 410 may be in compression. In one embodiment, extension 302, which may comprise lateral extension 406, can be described as comprising at least one shear force transfer surface and at least one compression load transfer surface if a load of compression or

<img file="MX359598B_D0047.tif" />

IMPI «eiwro MUlfcANO

DíUfflCWÍPM¹ g WIWTMAL tension at interface component 20 ^^ 13 ^^ 32 ^ 10371 déi limit collar to resist tension or compression loads can allow the interface component to be used as a connection point for one or more components, for Example using a threaded connection, which can represent an advantage over other types of butt collars. In one embodiment, extension 3 02, which may comprise lateral extension 406, can be described as comprising at least one shear force transfer surface, at least one compression load transfer surface, and at least one Tension charge transfer surface.

As shown in Figure 4D, extension 302 may comprise a mesh, sieves, woven material, non-woven fabric, tape, blanket, woven, cape, any multi-filament material, and any fibrous material that can be supplied in the form of tow, wicks, fabrics, and the like (collectively referred to as fibrous materials). The use of fibrous material as a portion or all of extension 302 may allow combination of extension 302 and boundary component 202 to form composite material. As described in greater detail above, composite materials can include a reinforcing agent and a matrix material. In one modality,

<img file="MX359598B_D0048.tif" />

IMPI boundary component 202 can act as the matrix material while the extension comprising a fibrous material can act as the reinforcing agent. The use of a fibrous material can act to both bond and transfer a charge from interface component 204 to boundary component 202 while also strengthening the composite material formed from the combination of boundary component 202 and extension 302 comprising the fibrous material. . Boundary component 202 can form a chemical and / or mechanical bond between boundary component 202 and extension 302 comprising of the fibrous material, where the extension comprising a fibrous material can provide a plurality of compression load transfer surfaces and / or tension. The plurality of fibers or filaments can have a distribution of surface orientations and / or surface characteristics. In one embodiment, the use of an extension comprising a fibrous material can be described as comprising a total charge transfer surface area, where a portion of the total charge transfer surface area comprises a charge transfer surface of compression and / or tension and a portion of the total surface area comprises a shear load transfer surface.

<img file="MX359598B_D0049.tif" />

As shown in Figure 4E, the exL tíliy 1'βΠ 3Ü2 ~ püe3e · comprise a single component rather than a plurality of longitudinal extensions. In this embodiment, the single extension can extend around the circumference of the well tube 206, or can extend only around a portion of the well tube 206. In one embodiment, the length of the extension 302 can be uniform around the circumference of the well tubular 206 in such a way that the edge 412 of the extension 302 can be in a normal plane with respect to the longitudinal axis of the well tubular 206. In one embodiment, the length of extension 302 can vary, allowing edge 412 to be configured in different patterns (eg, sawtooth, scalloped, feathers, randomly oriented, etc.). In one embodiment, extension 302 may comprise different surface features such as radially longitudinally oriented gaps and / or protrusions, a combination of both (eg, spiral, helical), and / or any random orientation.

<td colspan="2">As it is shown in</td><td colspan="4">Figures 5A and 5B, extension 302</td>

<td>can understand</td><td colspan="4">one or more surface features.</td><td>In</td>

<td>a modality.</td><td>said</td><td>one or</td><td>plus</td><td>characteristics</td><td>of</td>

<td>surfaces are</td><td>they can</td><td>use</td><td>with</td><td>any of</td><td>the</td>

extensions shown in Figures 4A to 4E,

IMPI

<img file="MX359598B_D0050.tif" />

including one or more of the components shown in Figure

4D. The use of surface features can assist in increasing the surface area for the bond between extension 302 and boundary component 202.

In one embodiment, one or more of the surface features can provide additional force transfer surface area.

In one embodiment, said one or more surface features can be described as providing an additional shear force transfer surface and / or an additional compression and / or stress load transfer surface.

As the picture shows

5A, the surface characteristics may comprise a projection

02 and / or a hole

504. Any type of projections 502 and / or recesses 504 can be used in any orientation with respect to extension 302, for example square or rectangular projections and / or recesses. As shown in Figure 5B, protrusions 506 and / or voids 508 can comprise a sawtooth pattern. Additional surface features can be used with extension 302 and / or surface 210, including, for example, corrugated, stippling, roughness, or the like each on a microscopic and / or macroscopic scale.

IMPI

<img file="MX359598B_D0051.tif" />

In an embodiment shown in Figure 6, a plurality of extensions 602, 604, 606 can be used at different radial distances. Exceptions 602, 604, 606 can represent overlapping portions of different extensions. While three extensions 602, 604, 606 are shown in Figure 6, any number of extensions can be used (eg, two, three, four, five, or more). The use of radially overlapping extensions can be applied to any of the modalities described in this document. The plurality of extensions can incorporate any of the different features shown in this document, including, but not limited to the features shown in Figures 2-5B.

In an embodiment shown in Figures 7A to 7C, limit collar 200 may comprise one or more portions that may not extend around the entire perimeter of downhole tubular 206. As shown in Figure 7A, the collar Boundary 200 may comprise a plurality of patches, where each patch comprises an interface component 706, a boundary component 202, and optionally, an extension 302. The configuration and materials that make up the Interface components, the boundary components, and any optional extensions or lateral extensions may be the same or different in each of the patches or portions of the

IMPI

<img file="MX359598B_D0052.tif" />

collar form 200 limit. Configuration and matei'iale'g— 'interface components, limit components, and any optional extensions or side extensions may incorporate any of the different features shown in this document, including, but not limited the features shown in the

Figures 2-6.

The plurality of current limit portions can have one or more grooves or channels

702 between adjacent portions, allowing the passage of a fluid during transport and / or operation within a well operating environment. The number and arrangement of the portions of the limit collar 200 can be configured to provide a flow area of ​​the desired groove or channel 702, thereby allowing a desired flow rate of fluid through one or more grooves or channels 702.

In an embodiment shown in Figure 7B, the limit collar may comprise an interface component 704 that extends around the perimeter of the well tube 206 while leaving a single slot or channel 710. In this embodiment, the interface component 704 may be configured as a C-ring design to allow the interface component 704, and optionally one or more associated extensions 302, to be positioned around the well tubular 206 without having to pass over one end of the tubular

<img file="MX359598B_D0053.tif" />

MEXICAN INSTITUTE OF INDUSTRIAL MOHEDAD of well 206 (eg, clamp-shaped '-' C; dl'afíísh'él1 ^ '^ ~ or adjusting ring). This may allow the application of the well tubular limit collar 200 206 without having to decouple a well tubular chain to provide access to the end of a well tubular 206.

In an embodiment shown in Figure 7C, the limit collar 200 can be constructed using a plurality of portions, and each portion can be oriented at an angle to the longitudinal axis of the well tube 206 on the surface of the tube of well 206. For example, portions of limit collar 200 may be arranged in a helical or angled pattern and provide angled or helical flow paths 708 between adjacent limit collar portions 200.

In an embodiment shown in Figure 7D, limit collar 200 can be constructed using a plurality of portions, and each portion may comprise a plurality of interface components 720, 722. Interface components 720, 722 may optionally have one or more extensions 302, which can overlap, couple, or form an integral component that couples to both interface components 720, 722. Boundary component 202 may be positioned around the plurality of interface components 720, 722 and optional extension 302.

IMPI

<img file="MX359598B_D0054.tif" />

This embodiment can be used to retain one ~ or * more 'components in the well tube 206. For example, the limit collar 200 comprising a plurality of components of

<td>720 interface,</td><td>722 can</td><td>use</td><td>for</td><td>to hold back</td><td>a</td>

<td>plurality of</td><td>centralizers</td><td>using</td><td colspan="2">a single necklace</td><td>of</td>

<td>limit 200.</td><td></td><td></td><td></td><td></td><td></td>

<td colspan="3">In a modality, the modality that</td><td>I know</td><td>shows in</td><td>the</td>

<td>Figure 7D is</td><td>you can use</td><td colspan="2">to form a</td><td colspan="2">centralizer</td>

<td>integral in the</td><td>tubular well</td><td>206 where</td><td>the</td><td>components</td><td>of</td>

interfaces can serve to guide wellbore tube 206 through the wellbore while reducing the point load on limit collar 200 by interacting with a portion of the wellbore (eg, a small tolerance constraint, an alteration in the inner wellbore). or tubular wall, etc.). The use of one or more patches can allow fluid to flow around the integral centralizer during the flow of fluids in the ring and / or during the transportation of the 2 06 well tube in the well. To help guide the limit collar 200 comprising a plurality of interface components 720, 722 through the well, one or more ends of the interface components may be tapered, angled, or in some other way to help guide that the 2 00 limit collar placed in the well tubular 206 through the well.

IMPI

<img file="MX359598B_D0055.tif" />

As shown in Figure 8, the coll-av of 1ίίΐί · 1^ιΐΒ^,2ΌΌ · described in this document can be used in a well with one or more small tolerance constraints. A small tolerance constraint generally refers to a constraint in which the inside diameter 858 of the constraint step is close to the outside diameter 860 of a well 206 tubular, tool, or other well device that passes through the constraint. . Small tolerance constraints can result from different well designs such as decreasing the diameter of casing chains, widened sections within a well, or collapsed wells or casings. For example, passing a smaller diameter liner 206 through a larger diameter liner can create a small tolerance constraint between the outer surface 864 of the smaller diameter liner 206 and the inner surface 866 of the larger diameter liner. . Examples of casing sizes that can result in small tolerance constraints within a well 114 are shown in Table 1.

<img file="MX359598B_D0056.tif" />

7

<td colspan="2">TABLE 1 Small Tolerance Constraints Coating Examples</td>

<td colspan="2">Size Size Q coating_EU goes to Cladding Smallest Diameter through Largest Diameter (centimeters) (centimeters)</td>

<td>8.89 (3.5 inch)</td><td>11.43 (4.5 inch)</td>

<td>11.43 (4.5 inch)</td><td>13.97 (5.5 inch)</td>

<td>12.70 (5 inches)</td><td>15.24 (6 inches)</td>

<td>13.97 (5.5 inch)</td><td>15.24 (6 inches)</td>

<td>16.83 (6.625 inch)</td><td>17.78 (7 inch)</td>

<td>17.78 (7 inch)</td><td>21.59 (8.5 inches)</td>

<td>19.37 (7.625 inch)</td><td>21.91 (8,625 inches)</td>

<td>19.69 (7.75 inch)</td><td>21.59 (8.5 inches)</td>

<td>24.45 (9.625 inches)</td><td>26.99 (10.625 inch)</td>

<td>25.08 (9.875 inches)</td><td>26.99 (10.625 inch)</td>

<td>27.30 (10.75 inch)</td><td>30.48 (12 inch)</td>

The designation of a restriction in a well 114 as a small tolerance restriction can vary depending on a number of factors including, but not limited to, the tolerances allowed in the well, the tortuosity of the well, the need to use connections to Flush or almost flush, the weight of the liner used in the well, the presence of fluid and / or solids in the well, etc. The tolerances allowed in the well can vary from one well to

IMPI

<img file="MX359598B_D0057.tif" />

another well. The term annular diameter difference can be used throughout this document to characterize tolerances in well 114 and refers to the total width of the ring (i.e. the sum of the annular width 850 and the annular width 851) in the small tolerance constraint . The annular diameter difference is calculated as the difference between the inside diameter 858 of the restriction step and the outside diameter

860 The tubular well 206 passes through the restriction.

In one embodiment, a small tolerance constraint can have a ring diameter difference of about 0.172 inch (0.72 cm) to about

3.81 cm (1.5 inches), for example, about

0.72 cm (0.125 inch), approximately

0.51 cm (0.2 inch) about 0.76 cm (0.3 inch), about

1.02 cm (0.4 inch), approximately 1.27 cm (0.5 inch), approximately 1.52 cm (0.6 inch), approximately 1.78 cm (0.7 inch), approximately 2.03 cm (0.8 inch), approximately 2.29 cm (0.9 inch), approximately 2.54 cm (1.0 inch), approximately 2.79 cm (1.1 inch), approximately 3.05 cm (1.2 inch), approximately 3.30 cm (1.3 inch), approximately 3.56 cm (1.4 inch), or approximately 3.81 cm (1.50 inch). While using an upper limit of approximately 3.81 cm (1.5 inches), the limit

IMPI

<img file="MX359598B_D0058.tif" />

higher may be greater or less than 3.81 ..... (i; inches) depending on other considerations and factors (including, for example, a risk / safety factor) to determine if a small tolerance constraint is present in a well . Well tortuosity refers to the deviation of the well from a straight hole. A constraint in a well is more likely to be considered a small tolerance constraint as the tortuosity of the well increases. In addition, a well tube with a flush or near flush connection refers to well tubes without or with only non-substantial alterations along the outer surface. For example in the connections between joints of the well tubulars. The use of flush or near flush fittings can create small tolerance constraints across larger functions of downhole tubing. Finally, the weight of the well tubular can affect both the flexibility of the well tubular chain and the difference in annular diameter between the well wall or the inner surface 866 of a larger diameter casing chain, depending on whether the Well 114 has been lined, and the outer surface 864 of a smaller diameter liner chain 206. The use of premium grade liner and / or premium grade fittings may indicate that the difference between inner and outer tube diameters is

IMPI

<img file="MX359598B_D0059.tif" />

small and indicates that there is a small 3e EoLeraridla ”restriction within well 114.

As shown in Figure 8, the height 852 of the boundary component 202 and / or the height 804 of the interface component 204 may vary depending on the width of the ring available between the well tubular 206 and the well side or inner surface 866 of the casing, depending on whether the well has been cased or not. Due to the tolerances available within a well, the well operator may specify a minimum tolerance for the space between the outermost surface (eg, surface 806 and / or surface 8 08 with the largest diameter) of a well tubular 206, which includes the limit collar 200, and the inner surface 866 of the well or the liner placed within the well. Using the tolerance, the height 852 of the boundary component 202 and / or the height 804 of the interface component 204 may be less than the annular diameter difference minus the tolerance established by the well operator. In one embodiment, the tolerance can be from about 0.254 cm (0.1 inch) to about 0.508 cm (0.2 inch). In one embodiment, no other tolerances than the pipe manufacturer's tolerances can be allowed, which can be based on industry standards (eg,

IMPI

<img file="MX359598B_D0060.tif" />

American Petroleum Institute (API, American, PétrólétfflT

Institute) applicable to the production of a well tube) of approximately 1% based on the outside diameter of the well tube 206 and the tolerance of the deviation of the inside diameter of the restriction of in the liner through which the tubular well comprising the centralizer). The minimum height of the boundary component 202 and the interface component 204 can be determined based on the structural and mechanical properties of the boundary component 202, the interface component 204, the component 222 being retained in the well tube 206, and the desired holding force of limit collar 200. The height of each of interface component 204, boundary component 202, and component 222 retained in downhole tubular 206 may be the same or different. The height of the boundary component 202 and the interface component 204 can be generally similar to allow a sufficient surface area for the transfer of an applied force between the interface component 204 and the boundary component 202. In one embodiment, the height of component 222 may be less than the height 804 of interface component 204 to allow limit component 202 and interface component 204 niiw iu »IJ 'T | '♦' V · * '* · * “” **' *^Λ

IMPI MEXICAN INSTITUTE OF INDUSTRIAL PROPERTY

<img file="MX359598B_D0061.tif" />

act as a guide for component 2'22 'during ¹ transportation of component 222 through the well.

Referring to Figure 2, limit collar 200 can be placed in well tubular 206 using a variety of methods. In one embodiment, the method used to place the limit collar 200 in the tubular well

206 may depend, at least in part, on the material or materials used to form the boundary component 202 and the interface component

204. The interface component

204 it can be formed from any suitable material as described in this document. One or more extensions (as shown in

Figure 3), which may optionally comprise one or more side extensions and / or one or more surface features, may optionally be integrally formed with interface component 204. In one embodiment, said one or more extensions 302 may be separately formed. interface component 204 and optionally couple to interface component 204.

Interface component 204 can then be placed in or around well tubular 206. In an embodiment in which interface component 204 extends around the entire perimeter of well tubular 206, the interface component can be passed over one end of the well tubular 206, for example before the

IMPI

<img file="MX359598B_D0062.tif" />

tubular well 206 is configured within a¹ tubular well chain. In one embodiment, a split ring (eg, a C-ring), interface component 204 can be used to allow interface component 204 to be positioned around the well tube 206 without passing the interface component over one end of the well tube 206. In an embodiment in which limit collar 200 does not extend around the entire perimeter of downhole tubular 206, the interface component can be placed directly over downhole tubular 206.

The interface component 204 can be placed in the wellbore before, during, or after the application of the boundary component or any portion thereof. For example, when a boundary collar 200 comprises an extension 320 with a surface in contact with the well tubular 206, the interface component comprising the extension 320 may be placed on or around the well tubular 206 prior to application of the Boundary Component 202, where the engagement of Boundary Component 202 can be coupled, and / or joined to Boundary Component of Well Tubular 206 and / or Interface Component 204. As another example, when limit collar 200 comprises an extension 302 with a surface on the outermost surface of limit component 202, the limit component

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<img file="MX359598B_D0063.tif" />

202 or a portion thereof may be applied prior to arranging interface component 204 comprising extension 302 on or around well tubular 206 comprising boundary component 202. As yet another example, when limit collar 200 comprises extension 302, at least two surfaces in contact with limit component 202, interface component 204 comprising extension 302 may be positioned around well tube 206 before application of boundary component 202. The boundary component can then be formed around extension 302 using, for example, a fluid boundary component. Alternatively, interface component 204 comprising extension 302 may be placed around well tubular 206 after application of a first portion of boundary component 202 and prior to application of a second portion of boundary component 202.

Boundary component 202 can be applied using a variety of methods to allow the boundary component to be coupled, and / or attached to well tube 206 and / or interface component 204. When the boundary component comprises a compound, a ceramic, a resin, an epoxy, and / or a polymer, the material or materials that form the boundary component 202 can be fluids that can be mu **:

IMPI

INSTITUTO MUICANC de la moheda r&gt; INDUSTRIAL

<img file="MX359598B_D0064.tif" />

provided before injection and / C— Eff 'ürlS modality, the material or materials of the boundary component can be provided as raw material components of two separate parts for mixing during injection and / or molding and whereby can be react the set. The reaction can be catalytically controlled such that the different components in the two separate parts of the composite will not react until they are brought together under suitable injection and / or molding conditions. Therefore, one part of the two-part raw material may include an activator, initiator, and / or catalyst component required to promote, initiate, and / or facilitate the reaction of the mixed composition as a whole. In some embodiments, proper balancing of components can be achieved in one mode by using pre-calibrated mixing and dosing equipment.

In one embodiment, limit collar 200 can be applied directly to well tube 206 through the use of a mold. In this process, the surface of the well tube 206 and / or interface component 204 with an optional extension 302 can optionally be prepared using any known technique to clean and / or provide a suitable surface for bonding the material of the boundary component 202 to the tubular well 206. In a

IMPI

<img file="MX359598B_D0065.tif" />

As an embodiment, the surface of the well tube 206 and / or the interface component 204 may be metallic. The bonding surface can be prepared by sandblasting, sandblasting, bead blasting, chemically treating the surface, heat treating the surface, or any other treatment process to produce a clean surface to apply the boundary component to the downhole tubular 206 and / or interface component 204. In one embodiment, the preparation process may result in the formation of one or more surface features such as corrugated, stippling, or other roughness of the surface, on a microscopic or macroscopic scale, to provide an increased surface area and suitable surface characteristics to improve the bond between the surface material (s) and the boundary component 202.

The optionally prepared surface can then be covered with an injection mold. The injection mold may be suitably configured to retain interface component 204 in the desired position and provide the shape of limit component 202 with an appropriate height. The injection mold may be provided with an adhesive on a surface of the mold that contacts the well tubular 206 and / or interface component 204.

It will be appreciated that the adhesive described in this disclosure

<img file="MX359598B_D0066.tif" />

IMPI

INSTITUTO MEXICANO DE LA prohibi r&gt; J- INDUSTRIAL may comprise any suitable material or device ”including, but not limited to, tapes, glues, and / or hardenable materials such as vulcanizing silicone at room temperature. The injection mold can be sealed against the prepared surface. After such general sealing against the prepared surface, the material or materials of the boundary component 202 can be introduced into a space between the injection mold and the preparation surface using a port placed in the injection mold. The material or materials of the boundary component 202 can flow through the mold and form the boundary component 202 on the surface of the well tube 206.

The material or materials of the boundary component 202 may be allowed to harden and / or set. For example, heat can be applied to thermally activate a thermal setting resin, or to allow a sufficient amount of curing of the material or materials of boundary component 202. After the material or materials of the boundary component 202 have sufficiently hardened and / or set, the injection mold may be unsealed from the well tube 206 and / or the interface component 204. In one embodiment, it can be used a plurality of boundary component 202 materials with multiple injection periods to produce a desired structure and / or composition of the boundary component

IMPI

<img file="MX359598B_D0067.tif" />

limit 202.

When the boundary component 202. comprises a polymer, the material or materials that form the boundary component 202 can be provided in the form of a tape, wrapper, sleeve, sheet, fiber, and / or a fibrous material that can be placed around well tubular 206. In one embodiment, limit collar 200 can be applied directly to well tubular 206. In this process, the surface of the well tube 206 and / or the interface component 204 with an optional extension 302 can optionally be prepared using any known technique to clean and / or provide a suitable surface for bonding the material of the boundary component 202 to the tubular well 2 06 as previously described. The preparation process may result in the formation of one or more features such as corrugated, stippled, or otherwise roughness of the surface, on a microscopic or macroscopic scale, to provide increased surface area and improved surface characteristics. between the surface and suitable for the boundary component material (s) 202.

In one embodiment, interface component 204 may be placed in place in the wellbore and boundary component 202 comprising the polymer can be

<img file="MX359598B_D0068.tif" />

<img file="MX359598B_D0069.tif" />

put around the interface component ', ”eT which can understand an optional 302 extension. When using a polymer sleeve, the sleeve can be passed through one end of the well tube and positioned relative to the well tube. When the polymer is in the form of a tape, sheet, or fiber, the polymer can be wrapped or otherwise positioned around the well tube 206 and / or interface component 204. In one embodiment, a layer of boundary component 202 can be placed around well tubular 206 prior to placement of interface component 204, which can be followed by a second layer of boundary component 202.

The boundary component comprising a polymer can shrink in response to the application of heat. In an exemplary method, a gas torch, heat gun, or other source can be moved around the circumference of the well tube 206 to apply heat to all exposed exterior surfaces of the polymer material. The material of the boundary component 202 can then shape the exposed portions of the well tube 206 and / or the interface component 204 in response to the application of heat, thereby forming the boundary collar 200.

When boundary component 202 comprises one or more metals, alloys, and / or a matrix phase comprising one

IMPI

<img file="MX359598B_D0070.tif" />

or more metals and / or alloys, the material, .or .material- ^ which · form the boundary component 202 can be placed around the well tube 206 using any known application process for metals, alloys, and / or matrix materials. In one embodiment, limit collar 200 can be applied directly to downhole tubular 206 using a thermal spray process. In this process, the surface of the well tube 206 and / or the interface component 204 with an optional extension 302 can optionally be prepared using any known technique to clean and / or provide a suitable surface for bonding the material of the boundary component 202 to the well tubular 206 as described above. The preparation process may result in the formation of one or more surface characteristics such as corrugated, stippled, or otherwise surface roughness, on a microscopic or macroscopic scale, to provide increased surface area and suitable surface characteristics. to improve the bond between the surface and the boundary component material (s) 202.

In one embodiment, interface component 204 may be positioned in place over the downhole tubular and limit component 202 comprising the polymer may be positioned around the interface component which may

IMPI

<img file="MX359598B_D0071.tif" />

understand an optional 3 02 extension, -tw · · _ · _ ·? ιρcnanto - d? Boundary can then be applied to downhole tubular 206 and interface component 204. In one embodiment, a layer of the boundary component can be applied to downhole tubing prior to placement of the interface component, which can be followed by applying another layer of the boundary component.

In one embodiment, the boundary component comprising one or more metals, alloys, and / or matrix phase comprising one or more metals and / or alloys can be applied using a thermal spray process. One type of thermal spray system can comprise a double wire system. A double wire system uses a first wire and a second wire with an applied voltage between the wires. In one embodiment, the first wire and the second wire may be of the same or similar design (eg, solid or tubular, approximately the same diameter, etc.), and may have the same or different chemical compositions. In one embodiment, the first wire may comprise a first position, while the second wire may comprise the same or a complementary composition with respect to the first composition to generate a desired boundary component 202 in well tube 206. When the voltage is applies to wires, the proximity of

IMPI

<img file="MX359598B_D0072.tif" />

Wire ends can create un-jrrn ont-rg go&gt; «ends and cause wires to melt. An air source can be used to atomize the resulting molten metal caused by the arc into small droplets and propel them at a high speed towards the well tube 206 and / or interface component 2 04. The double wire spray process can use commercially available equipment such as torches, wire feed systems, and power sources. Other thermal spraying processes can be used to achieve deposition of the material or materials of boundary component 202 on well tube 206 and / or interface component 204.

The deposition and cooling of the droplets can result in the accumulation of the material or materials of the boundary component in the well tube.

206 and / or the interface component

204. Materials can be deposited until a desired boundary component 202 is formed in the well tubular 206. In one embodiment, some post-processing of boundary component 202 can be performed to produce or produce a smooth surface and / or or a desired ending.

As shown in Figure 9, a 2 06 well tubular comprising a limit collar 904 retaining a component 902 can be provided using one or more of

<img file="MX359598B_D0073.tif" />

IMPI

INSTITUTO MEXICANO DE LA MtOFILDAL θ 3 INDUSTRIAL limit collars 904, 906 described in SSte documeñtoT In one embodiment, component 902 retained in tubular well 206 can comprise any number of components including, but not limited to, a centralizer, a shutter, a cement basket, different cement securing tools, test tools, and the like. In one embodiment, component 902 may comprise a centralizer of the type disclosed in United States Patent Application No. 13 / 013,259, entitled Composite Bow Centralizer, by Lively et al. and presented on January 25, 2011, which is incorporated herein by reference in its entirety. Component 902 can be slidably coupled with downhole tubular 206 to allow relative movement relative to downhole tubular 206. Component 902 may be retained in downhole tubular 2 06 by the formation of a limit collar 904 using any of the methods described in this document, followed by the arrangement of one or more components 902 around the well tube 206. Component 902 may be configured to move relative to well tubular 206 while being retained when component 902 is attached to limit collar 904. One or more additional limit collars 906 can be formed using any of the Regcrifr.o methods. " en.-ggte document, thus retaining component 902 in well tubular 206 between the two limit collars 904,

906. Once formed, wellbore tubular 206 comprising at least a limit collar 904 and component 902 being

<img file="MX359598B_D0074.tif" />

<td>held in</td><td>the tubular</td><td>of</td><td colspan="2">well 206 can be placed inside</td>

<td>from the well.</td><td></td><td></td><td></td><td></td>

<td>In a</td><td>modality,</td><td>I know</td><td>can use a plurality</td><td>of</td>

<td>components</td><td>retained</td><td>by</td><td>a plurality of necklaces</td><td>of</td>

boundary in accordance with the present disclosure with one or more sections of downhole tubular. A well tubular chain refers to a plurality of well tubular sections connected together for transportation within the well. For example, the well tubular chain may comprise a casing chain transported within the well for cementing. The well casing chain may pass through the well before the first casing chain is cemented, or the casing chain may pass through one or more casing chains that have been cemented into place within the well. In one embodiment, the well tubular chain may comprise premium fittings, flush fittings, and / or near flush fittings. One or more small tolerance constraints can be found according to the chain of

<img file="MX359598B_D0075.tif" />

tubular well passes through the well ο · 4μ ·· sadonao 4 »lining cemented in place within the well. A plurality of limit collars as described herein may be used in the well tubular chain to maintain one or more components (eg, a centralizer as a plurality of centralizers) in the conforming well tubular chain This is transported within the well. The number of limit collars and their respective spacing along a chain of well tubulars can be determined based on a number of considerations including the properties of each component that is retained in the well tubular, the properties of the well (eg, sizing, weight, etc.), and the properties of the well through which the well tubular is passing (eg, annular diameter difference, tortuosity, orientation of the well, etc.). In one embodiment, a well design program can be used to determine the number and type of limit collars and components retained in the well tubular chain at the different inlets as described in this document. The number and spacing of boundary collars and components retained by boundary collars along the length of the well tube may vary along the length of the well tube based on the expected conditions

<img file="MX359598B_D0076.tif" />

MEXIGANC INSTITUTE OF INDUSTRIAL MONEDAD

<img file="MX359598B_D0077.tif" />

inside the well. In one embodiment, the well may have at least a small tolerance constraint within the well.

As described in this document, the boundary collar can be used with a well tubular placed inside a well in an underground formation. The limit collar described in this document can be attached to a downhole tubular by using a limit component instead of set screws. The use of the limit component can allow the limit collar to have a lower height than that required for set screws. Which can allow the limit collar to be used in small tolerance wells. The use of an interface component can prevent point loading on the limit component, reducing the potential for limit collar failure associated with point load scenarios. The use of an extension can further strengthen the limit collar and allow the load to be more evenly distributed from the interface component through the limit component. Furthermore, the use of a lateral extension and / or surface feature can allow the interface component to more easily withstand both compression and tension loads. Furthermore, the limit collar of the present disclosure can be quickly installed in pipeline

IMPI

<img file="MX359598B_D0078.tif" />

existing and may not require Qeili submersibles^,l! ádbS''pa^,tⁱa ^ U use. The limit collar can be installed by forming the limit collar directly into a tubular well, such as an existing casing section. This production method may allow the limit collar to be installed at the well site or within the oil field rather than requiring a dedicated manufacturing facility and dedicated submersibles to attach the limit collar to a chain of well tubulars.

The use of the limit collar disclosed in this document comprising a plurality of portions or patches can provide one or more flow slots or channels, thereby allowing fluid to flow past the limit collar. This configuration can assist in the flow of fluids in a ring created between the well tube and an outside well tube or the well wall. When used to retain a centralizer in a casing chain during a cementing operation, the system can allow proper mud displacement with cement, reducing the likelihood of channeling and incomplete cementing. Traditional stop collars that use setscrews extend around the entire perimeter of the wellbore, reducing fluid flow in the ring and potentially allowing

<img file="MX359598B_D0079.tif" />

channeling and incomplete displacement of drilling fluids (eg, drilling mud). Channeling can result in the migration of hydrocarbons through the channels during the life of the well. Improved fluid flow around the wellbore due to flow grooves or channels can represent an advantage of the present limit collar compared to stop collars

<td colspan="2">traditional</td><td>than</td><td>I know</td><td colspan="2">extend</td><td>around</td><td>of</td><td>all tubular</td>

<td>well</td><td>and that</td><td>are</td><td colspan="2">retained</td><td>by</td><td>screws</td><td>of</td><td>fixation.</td>

<td>I know</td><td colspan="2">disclose</td><td>to the</td><td>less</td><td>a</td><td>modality</td><td>and</td><td>the variations,</td>

Combinations, and / or modifications of the modality (s) and / or characteristics of the modality (s) made by a person skilled in the art are within the scope of the disclosure. Alternative modalities that result from combining, integrating, and / or omitting characteristics of the modality (s) are also within the scope of disclosure. When numerical ranges or limitations are expressly established, such express ranges or limitations should be understood to include mandatory ranges or limitations of similar magnitude that fall within expressly established features or limitations (eg, from about 1 to 10 includes, 2, 3, 4, etc .; greater than 0.10 includes 0.11, 0.12, 0.13, etc.). For example, whenever a numerical range with a lower limit, Ri, and a

IMPI

<img file="MX359598B_D0080.tif" />

upper limit, R_orAny number that falls within the SeT range is specifically disclosed. In particular, the following numbers within the range are specifically disclosed: R = Ri + k * (R_or - Ri), where k is a variable that ranges from 1 percent to 100 percent with an increase of 1 percent, that is, k is 1 percent, 2 percent, 3 percent, 4 percent, 5 percent, ..., 50 percent, 51 percent, 52 percent, 95 percent, 96 percent, 97 percent, 98 percent, 99 percent, or 100 percent. On the other hand, any numerical range defined by two R numbers as defined above is also specifically disclosed. The use of the term optionally with respect to any element of a claim means that the element is required, or alternatively, the element is not required, both alternatives are within the scope of the claim. The use of broader terms such as comprises, includes, and has to be understood to provide support for narrower terms such as consisting of, consisting essentially of, and comprising essentially of. Accordingly, the scope of protection is not limited by the description set forth above but is defined by the claims that follow, that scope includes all equivalents of the subject matter of the claims. All and

<img file="MX359598B_D0081.tif" />

IMPI

MEXICAN INSTITUTE OF INDUSTRIAL MONEDAD

<img file="MX359598B_D0082.tif" />

Each of the claims is "incorporated" by further disclosure in the specification and the claims are embodiment (s) of the present invention.

IMPI

<img file="MX359598B_D0083.tif" />

NOVELTY OF THE INVENTION,

Having described the present invention as above, it is considered as a novelty and, therefore, the content of the following is claimed as property: