Untitled record

Full description

Sister Ar'a's background

The present invention relates to intentionally stimulating downhole formation damage in a targeted zone to produce a deep seal of the formation die and seal the zone at the wellbore surface.

Predicting formation plug damage that occurs during well drilling is an important factor in optimizing field development

<p dir="rtl">5 Oil. The economic impact of near-wellbore catalysis-induced damage and cleanup efficiency have led to significant advances in both experimental and numerical studies to evaluate wellbore flow properties during oil production.</p>

The potential for plugging damage to formation permeability exists during operations throughout the life of the well. Wellbore damage can cause a reduction in the natural ability of the reservoir to produce its fluids, such as a decrease in...

<p dir="rtl">10 Porosity or permeability, or both. Damage can occur near the face of the wellbore, which can be easy to repair, or be deep in the rock, which can be difficult to repair.</p>

Damage can occur when sensitive formations are exposed to drilling fluids. Damage to a formation dam usually occurs through multiple mechanisms which can include the following:

<p dir="rtl">15 1- Physical blocking of pores by drilling mud solids;</p>

<p dir="rtl">2- Changing the wettability of the reservoir rocks;</p>

<p dir="rtl">3- Deposition of insoluble substances in the pore spaces;</p>

<p dir="rtl">4- Swelling of clay in the pore spaces;</p>

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<p dir="rtl">5- Transport of fine materials to the necks of the pores;</p>

<p dir="rtl">6- Introducing a non-mobile phase; And</p>

<p dir="rtl">7- Formation of emulsions and clogging.</p>

In well completion operations, there are several known damage mechanisms, such as intrusion of incompatible fluids

<p dir="rtl">5 It causes swelling of the formation slurry, or fine solids from dirty fluids that clog the formation mold. Since damage can significantly affect the productivity of any well, adequate precautions should be taken to avoid such damage during all stages of the well's life.</p>

Deterioration of natural or stimulated production can develop in reservoirs, in the area near the wellbore, or perforations. Natural damage occurs when produced reservoir fluids move through the reservoir, while...

<p dir="rtl">10 Induced damage is the result of external operations and fluids in the well, such as drilling, well completion, or operations</p>

Maintenance, or simulation wizards. Some of the induced damage leads to normal damage mechanisms. Natural deterioration includes phenomena such as transport of fine materials, clay swelling, crust formation, organic deposition, including paraffins or asphaltenes, and mixed organic and inorganic deposition. Induced damage includes blockage caused by foreign particles in the injected fluid, changes in wettability,

<p dir="rtl">15 Or emulsions, sediments, or clay deposits resulting from acid reactions and activity</p>

Bacterial, and water masses. Borehole cleaning and mold simulation treatments are two different processes that can remove natural or induced damage. Choosing the appropriate operation depends on the location and nature of the damage.

The current practice of closing a water area requires equipment to line the entire open pit

He filled it with cement and optionally punctured the oil area while isolating the water area and preserving it 20 behind the lining and cement.

In general, formation blocking is an undesirable phenomenon. The problem that is sought to be addressed by the present invention is how to use these phenomena to close the porosity, eliminate the permeability of the water zone, and retain the oil-producing zone in an open hole to allow flow into the well bore.

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General description of the invention

A representative implementation of the present subject matter described within this disclosure is a method having the following features. An explosion is initiated in the first container carrying explosive material. The first container is placed inside a well formed in the formation. The explosion causes the gas in the first container to expand. Flowing

<p dir="rtl">5 Gas expanding into a second container connected by fluid to the first container. The second container holds formation dam fluid prepared for fluid flow through the formation. Using the expanding gas, formation sealing fluid flows from the second container into a balloon attached to the outside of the second container. Using the expanding gas, the balloon is inflated. At least a portion of the formation sealing fluid is trapped between the inner wall of the well portion and the balloon. The wall portion is sealed by melting the inflated balloon.</p>

<p dir="rtl">10 Aspects of the representative method, which may be combined with the representative method individually or in combination, include the following. Initiating an explosion involves directing a spark toward the explosive.</p>

Aspects of the representative method, which may be combined with the representative method individually or in combination, include the following. The explosive material is either a solid explosive or a compressed flammable gas.

Aspects of the representational method, which may be combined with the representational method individually or in combination, include:

<p dir="rtl">15 the next. The expanding gas flows from the first container to the second container in response to a pressure on the first container that meets a limit pressure on the first container.</p>

Aspects of the representative method, which may be combined with the representative method individually or in combination, include the following. Using the expanding gas, the flow of formation sealing fluid out of the second container to a balloon attached to the outside of the second container involves applying a force to a piston in the second container. Causes the piston

<p dir="rtl">20 The formation bridging fluid flows through an outlet in the second container to the balloon.</p>

Aspects of the representational method, which may be combined with the representational method individually or in combination, include the following. Using the expanding gas, the balloon is inflated. At least a portion of the formation sealing fluid is trapped between the inner wall of the well portion and the balloon. Formation sealing fluid flows through an opening in the balloon

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Towards the part of the well. The inflation rate is delayed until at least a portion of the formation plugging fluid flows through the hole in the balloon toward the portion of the well.

An exemplary implementation of the present article described in this disclosure is a device having the following features. The first container holds explosive material. The first container is initialized to be placed in a well in a formation. Cause

<p dir="rtl">5 Ignition of the explosive material in the expansion of hot gas in the first container. A second container holds the composition fluid. The second container is appended to the first container. The second container is configured to be positioned at the well part of the well. The second container is configured to receive the expanding gas from the first container and to cause the formation sealing fluid to flow out of the second container using the expanding gas. A balloon is attached to the outside of the second container. The balloon is configured to inflate in response to receiving formation sealing fluid from</p>

<p dir="rtl">10 The second container, causing at least a portion of the formation sealing fluid to flow into the well portion, and sealing at least a portion of the formation sealing fluid into the well portion to prevent the fluid from flowing through the well portion.</p>

Aspects of the analog device, which may be combined with the analog device individually or in combination, include the following. A valve fluidly connects the first container and the second container. The valve is configured to open when the pressure of the expanding gas is greater than a limit pressure on the first container.

<p dir="rtl">15 Aspects of the analog device, which may be combined with the analog device individually or in combination, include the following. A buoyancy plunger is placed in the second container. The float piston is configured to be forced through the second container by the expanding gas from the first container.</p>

Aspects of the analog device, which may be combined with the analog device individually or in combination, include the following. The second container includes multiple roads dug into the inner wall of the second container. It includes

<p dir="rtl">20 The float piston has multiple guides positioned in their own number of ways to guide the float piston through the second container.</p>

Aspects of the analog device, which may be combined with the analog device individually or in combination, include the following. The second container includes an outlet through which formation sealing fluid can flow into the balloon.

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Aspects of the analog device, which may be combined with the analog device individually or in combination, include the following. The port is configured to go from a closed position - before the expanding gas flows into the second container - to an open position after the expanding gas flows into the second container.

Aspects of the analog system, which may be combined with the analog system individually or in combination, include:

<p dir="rtl">5 the next. Multiple shear screws are placed in the second container. The shear pins are configured to support the float piston before the expanding gas flows into the second container and to both open the port after the expanding gas has flowed into the second container and allow the float piston to be pressed through the second container.</p>

Aspects of the analog system, which may be combined with the analog system individually or in combination, include:

<p dir="rtl">10 the next. Shear bolts are configured to be sheared under the force of the float piston to allow the float piston to be pressed through the second container.</p>

Aspects of the analog device, which may be combined with the analog device individually or in combination, include the following. The port shall be a central port. The second container includes an uphole port above the center port in order to cause the formation sealing fluid to flow to the balloon at the top of the well, and a downhole port below the center port 15 to cause the formation sealing fluid to flow to the balloon downhole.

Aspects of the analog device, which may be combined with the analog device individually or in combination, include the following. The balloon is a central balloon. The second container includes a balloon at the top of the well attached to the outer surface of the second container above the center balloon. The balloon at the top of the well is configured to inflate in response to receiving formation sealing fluid from the second container and to seal tightly against the top of the well above

<p dir="rtl">20 Well part. A downhole balloon is attached to the outside of the second container below the central balloon. The downhole balloon is configured to inflate in response to receiving formation sealing fluid from the second container and to seal tightly against a downhole portion above the well portion.</p>

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Aspects of the analog device, which may be combined with the analog device individually or in combination, include the following. The inflation rate of both the top-well balloon and the bottom-well balloon is greater than the inflation rate of the center balloon.

An exemplary implementation of the present material described within this disclosure is a system for sealing a wellbore

<p dir="rtl">5 It has the following features. An inflatable pad is installed at the top of the well and placed on top of the wellbore sealer. The packing at the top of the well is configured to at least partially fluidly isolate the wellbore sealer. An inflatable pad is installed down the well and placed under the wellbore sealer. The downhole packing is configured to at least partially fluidly isolate the wellbore sealer. The wellbore sealer includes a first container holding an explosive. The container is initialized</p>

<p dir="rtl">10 The first is to be placed in a well in a formation. Ignition of the explosive causes the expansion of the hot gas in the first container. A second container holds the composition fluid. The second container is appended to the first container. The second container is configured to be positioned at the well portion of the well. The second container is configured to receive the expanding gas from the first container and to cause the formation sealing fluid to flow out of the second container using the expanding gas. A balloon is attached to the outside of the second container. The balloon is being prepared for you</p>

<p dir="rtl">15 It swells in response to receiving the formation sealing fluid from the second container, causing at least a portion of the formation sealing fluid to flow into the well portion, and preventing at least a portion of the formation sealing fluid from leaking into the well portion to prevent the fluid from flowing through the well portion.</p>

Aspects of the representational system, which may be combined with the representational system individually or in combination, include the following. It can include both an inflatable top-well pad and a down-hole inflatable pad

<p dir="rtl">20 An electric pump is connected via a fluid to a fluid in the borehole.</p>

Aspects of the representational system, which may be combined with the representational system individually or in combination, include the following. The second container includes a port through which the formation sealing fluid flows into the balloon.

Brief explanation of the drawings

Preferred embodiments of the invention are described in more detail below and with reference to the drawings where:

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Figure 1 represents a view from a height, in partial cross-section, of a device constructed according to the present invention. A chemical balloon having three inflatable sections is placed in an open hole section of a wellbore supported by coiled tubing and positioned below the end of the production tubing, the The wellbore has an unwanted water area, and the wellbore is filled with formation fluid or completion fluid for drilling another well referred to.

<p dir="rtl">5 In this application it is referred to as “borehole fluid”;</p>

Figure (2a) represents an enlarged partial cross-section view of the uphole portion of the device in Figure (1), showing the displacement of the borehole fluid through the circulation valve once the device is lowered to the target area;

Figure No. (2b) represents a partial cross-sectional, enlarged view of the components of the device shown in the figure

<p dir="rtl">10 No. (1), explaining the mechanism used to initiate the chemical reaction that expands the central balloon;</p>

Figure No. (3) represents an enlarged side view of a multi-section chemical balloon that forms...

Part of the device shown in Figure No. (1) that delivers formation sealing fluid to the target area.

Figure No. (4) represents a disassembled magnified view of a section of the central balloon shown in Figures No. (1) and No. (3), showing one of several weak sections of the balloon that allow the formation sealing fluid to pass through.

<p dir="rtl">15 From the container inflate and pass through the weak sections of the central balloon in order to penetrate the formation and seal the target area while the balloon inflates;</p>

Figure No. (5) represents a cross-sectional view, taken along lines 5-5 of Figure No. (4), showing a portion of the weak central balloon wall that has a low thickness.

Figure No. (6) represents a partial cross-sectional view of part of the central balloon wall shown in

<p dir="rtl">20 Figures No. (4) and No. (5), when torn during inflation, allow the reaction products of the pressure-adjusted sealant to pass through the balloon wall to the collar to seal the target area.</p>

Figure No. (7) represents a cross-sectional view taken along the two lines 7-7 in Figure No. (3), illustrating an embodiment of the invention in which two or more ratchet rings are combined in the central balloon to provide

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Circumferential stiffening of selected portions of the balloon as it expands during a chemical reaction and to maintain it in its fully expanded position against the borehole wall after expansion;

Figure No. (8) represents an enlarged view of the indicated part shown in Figure No. (7) showing the engagement of the ratchet rings.

<p dir="rtl">5 Figure No. (9) represents a cross-sectional view, taken along lines 9-9 in Figure No. (7), of one example of a rigid reinforced ligament in the form of a metal strip with a diamond-shaped mesh embedded in the material of the central balloon to provide rigidity in the longitudinal direction to complete The circumferential stiffness provided by the extendable ratchet rings shown in Figures (3) and (7);</p>

Figure No. (10) represents an enlarged height view of a timed circulation valve installed in connection via

<p dir="rtl">10 fluid through a pressure valve in a chemical container filled with a reactant;</p>

Figure No. (11) represents a cross-sectional view of a chemical container shown in Figures No. (2) and No. (10) in the process of starting the reaction before the pressure-conditioned reaction products are discharged through the pressure valve at the bottom of the well to inflate the balloons.

Figure No. (12) represents a cross-sectional view similar to Figure No. (11) showing the pressure valve

<p dir="rtl">15 The bottom of the well advanced to the open position to allow reaction products from the chemical container to enter the inflation container to displace the formation sealant while inflating the three chemical balloons independently;</p>

Figure No. (13) represents a cross-sectional view similar to Figures No. (11) and No. (12), showing the inflating of the three balloons at an intermediate stage, with the barrier balloons at the top of the well and the bottom of the well inflated.

<p dir="rtl">20 fully in sealing contact with the borehole wall to form an independent segment with the central balloon partially inflated;</p>

Figure No. (14) represents a cross-section view similar to Figure No. (13) showing the sequential entry of the reacting chemicals and the displacement of the formation sealing fluid into the central balloon through the existing inflation valves.

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At the sides of the blow container that supports the balloons, to extend the balloons up the well and down the well, and to allow formation sealing fluid to pass through the weak, torn parts of the central balloon and penetrate the formation after the hot reaction product has softened and melted the balloon while it is against the well wall to seal the water zone targeted;

<p dir="rtl">5 Figure No. (15) represents a cross-sectional view, taken along lines 15-15 in Figure No. (14), showing the expanded and melted portion separated from the central balloon and the corresponding expansion of the toothed ratchet ring outward to a position that stabilizes the expanded diameter of the separated portion of The central balloon is maintained and maintained, with the grid being diamond-shaped providing stability in the longitudinal direction;</p>

Figure No. (16) represents a cross-sectional view similar to Figure No. (14) showing the completion of the tightening process.

<p dir="rtl">10 Wall sealing and partial withdrawal to production tubing from coiled tubing, blow-off container, chemical container, and residual material from uphole and downhole balloons after rupture;</p>

Figure 17 represents a view from height, in partial cross-section of another model, showing the insertion of an expandable wire strut device into the uninflated balloon which will hold the fully inflated central balloon against the wall of the borehole;

<p dir="rtl">15 Figure No. (18) represents a cross-section view, taken along lines 18-18 in Figure No. (17), showing the expandable wire stent device placed between two expandable meshes of polymeric material that are integrated into the central balloon wall;</p>

Figure No. (19) represents a view similar to Figure No. (17) showing the complete expansion of the central balloon and the wire stent device expanding against the formation wall.

<p dir="rtl">20 Figure (20) represents a view from height, in partial cross-section, of another model that includes dual inflatable gaskets in place of balloons at the top of the well and the bottom of the well, showing the device being lowered to a position in the target area;</p>

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Figure (21) represents a view from a height, in partial cross-section, similar to Figure (20), showing the device positioned such that the central balloon is aligned with the target area;

Figure No. (22) represents a view from a height, in a partial cross section, similar to Figure No. (21), showing the inflatable gaskets at the top of the well and the bottom of the well using special electric pumps.

<p dir="rtl">5 them; And</p>

Figure No. (23) represents a view from a height, in a partial cross section, similar to Figure No. (22), showing the passage of the caulking fluid through the weak, torn parts of the central inflated balloon to penetrate the formation in the target area.

Figure No. (24) represents a schematic view of another implementation of a balloon that is part of the device shown in Figure 10 No. (1) and delivers the formation sealing fluid to the target area.

Figure No. (25) is a process flow chart for an example of a process to seal a desired formation process in the well wall.

Figure No. (26) represents a schematic view of a central balloon with a hole.

Figure No. (27) represents a schematic view of inflated balloons touching the wall of the well.

<p dir="rtl">15 Figure No. (28) represents a schematic view of melted balloons that prevent the leakage of formation sealing fluid into the well wall.</p>

Detailed description:

Referring now to the drawings, and to Figure 1 specifically, showing from a height and in partial cross-section, a device 10 constructed according to one embodiment of the present invention. The device includes a retrograde inflatable component, generally referred to as a balloon 12, Which consists of a number of

<p dir="rtl">20 Sections: As shown, there are three sections, and there is a central section 12A, referred to as the main balloon</p>

Or the middle or central one, a balloon at the top of well 12b, and a balloon at the bottom of well 12c. In the following description, reference to balloon 12 refers to the balloon as a whole, including its three sections, 12a, 12b,

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<p dir="rtl">and 12C, where balloon 12A is the central or middle balloon. The three sections are inflated according to a predetermined sequence as will be described in more detail below.</p>

The uninflated balloon 12 and its related components described below are placed in the wellbore 11 by coiled tubing 14 which passes through the production tubing 30 until it reaches the target area 5 16 of the wellbore. In order to describe this model, the target area will be indicated

<p dir="rtl">16 As an “undesirable” water area. In Figure 1, the unwanted target zone 16 is located deeper in the borehole 11 than the downhole end 22 of the production tubing 30 and well lining 18.</p>

The unwanted area 16 can also represent a side drilling hole which can be horizontal

<p dir="rtl">10 or self-contained, which may have been partially damaged by one or more factors, including, but not limited to, contact with wellbore fluids used during drilling/completion and workover operations. It is an area of ​​low permeability near the wellbore 11 (i.e., the crust), often the result of the intrusion of a foreign fluid into the reservoir rock.</p>

The three balloons 12a, 12b, and 12c can be made of any thermoplastic expandable material.

<p dir="rtl">15 Suitable elastic, i.e., polymer, preferably rubber, natural or synthetic. Different elastic and resilient materials can be used for each of the three balloons and/or individual balloons can be produced with different wall thicknesses, material properties and means of attaching them to their support surface. The thickness and flexibility of the walls, or sections of the walls of the balloons, shall be sufficient to permit extension and safe contact with the adjacent wall surface.</p>

<p dir="rtl">20 As will be described in more detail below, the balloons 12 are inflated via an exothermic reaction in the reaction vessel 34 that is initiated by pumping a predetermined amount of fluid reactant 33 (not shown) from the surface through the coiled tubing 12 and through the inlet valve The operator pressurizes the top of the well 36 into the chemical container 34 and comes into contact with one or more reactants loaded into the chemical container 34 while preparing the device before lowering it into the well shaft.</p>

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<p dir="rtl">11. The blow-off container 24 is also filled at the surface with formation sealing fluid 25 and has at least three blow-off ports. In a preferred embodiment, the three balloons are secured in position on the outside of the inflation container 24, for example, by means of an adhesive. It is preferable for the central balloon to have a number of weak areas that will rupture in the early stages of inflation. After rupture, it will be allowed</p>

<p dir="rtl">5 The wall is weakened by the passage of the formation sealing fluid from the inflation container 24, while allowing the balloon 12 to inflate and expand diagonally in the circular ring-shaped space or the independent portion defined by the adjacent balloons.</p>

The upwell and downhole balloons 12B and 12C will inflate first to provide tight seals against the well wall at either end of the central balloon, thus acting as barriers to the formation sealing fluid 25.

<p dir="rtl">10 This independent fluid-tight portion will allow the formation sealing fluid 25 to be forced deep into the formation under the pressure produced by the hot rapidly expanding reaction product. As noted, initially, wellbore 11 is filled with formation fluids or other completion fluids which are referred to herein as “wellbore fluid.”</p>

Referring now to Figures 2a and 2b in conjunction with Figure 1, the balloon 15 12 is positioned and supported by an inflation container 24, which includes a number of inflation valves 26, 27, and 28,

Which, when opened, allows formation sealing fluid 25 to pass under pressure, and expands the three sections 12a, 12b, and 12c of the balloon 12 as the reaction products enter from the top into the container 24 described in more detail in the discussion of Figures (11)-(14).

Referring again to Figures No. (2a) and No. (2b), in conjunction with Figure No. (1), it includes:

<p dir="rtl">20 The assembly of the invention contains coiled tubing 14 spread across production tubing 30 in the drill hole which is attached at its downhole end to a timed circulation valve 32 which, in turn, is attached to a chemical container 34, which is connected in connection with a fluid to the pressure valve 40 of the blow-off container. 24. A recirculating valve can be any type of programmable recirculating valve made for oil well drilling applications, such as a remotely operated recirculating valve -Halliburton eRED</p>

<p dir="rtl">25 HS® or Omega Remotely Operated Completion Circulation Valve. The timed circulation valve is maintained</p>

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<p dir="rtl">32 open while the tool is lowered into the drill hole so that wellbore fluids enter the coiled tubing, facilitating deployment of the assembly through the production tubing 30.</p>

The chemical container 34 may contain any suitable chemical substance or reactants 38 that can be activated to produce an exothermic reaction and preferably provide limited or controlled “explosive” expansion of

<p dir="rtl">5 By adding the liquid reactant as an activating medium. In the present example, the chemical container 34 preferably contains a supply of pure solid reactant, such as sodium metal 38 which can subsequently be activated by a suitable amount of water delivered by coiled tubing from the surface under pressure to initiate the necessary reaction with sufficient force to expand the balloons Inflatables 12 quickly. For safe handling, sodium metal can be immersed in kerosene or a liquid</p>

<p dir="rtl">10 Another reactant in the tightly closed chemical container 34. Other suitable known reactants shall be considered within the scope of the invention, provided that they are capable of producing an exothermic reaction</p>

fast.

Once the balloon 12 reaches the target area 16, a predetermined amount of fluid activating reactant 33 is required to complete the highly exothermic reaction with pumping

<p dir="rtl">15 The substance or chemicals within the chemical container 34 to the coiled tubing 14 from the surface. The fluid reactant is followed by a displacement fluid (not shown) that is pumped into the coiled tubing 14 to displace the wellbore fluids 31 through the timed circulation valve 32 as shown in Figure 2A. The timed circulation valve 32 is programmed to calculate the time scale of the Circulation (not shown) The time required to activate the fluid reactant 33 so that it is pumped from the surface to</p>

<p dir="rtl">20 Circulation valve depth. When the fluid reactant 33 reaches the timed circulating valve 32, pumping can be stopped while the timed circulating valve 32 automatically closes, and then, additional displacement fluid is pumped into the coiled tubing to raise the pressure to a level sufficient to open the pressure-actuated inlet valve 36 which is Place it on the chemical container 34. Alternatively, the fluid flow can be continuous and the circulation valve will automatically change the flow pattern to allow the material</p>

<p dir="rtl">25 The fluid reactant develops sufficient pressure to open the inlet valve 36.</p>

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Referring again to Figure 2B, the pressure-operated inlet valve 36 is set to open at a predetermined pressure, thus allowing the activated fluid reactant 33, for example, water, to enter the chemical container 34 to react with the chemical reactant, at For example, sodium metal 38, which initiates a controlled explosive reaction within the chemical container 5 34.

The pressure outlet valve 40 is positioned at the bottom of the chemical container 34 and is connected to the blowing container 24. The pressure outlet valve 40 is configured to open under the pressure produced by the chemical reaction and allow the hot pressure-conditioned reaction products to enter the blowing container 24.

<p dir="rtl">10 As the reaction products enter the inflation container 24, the three pressure-actuated inflation valves 26, 27, and 28 open to allow the formation sealing fluid 25 to exit the inflation container and begin inflating the three sections of the balloon 12 according to the predetermined sequence described above. The central balloon 12a inflates at a slower rate due to its relatively larger size, while the adjacent smaller balloons 12b and 12c inflate fully first and provide the required seal with the borehole wall to isolate the target area 16.</p>

<p dir="rtl">15 This filling sequence may also be accomplished by changing the volume or flow rate of the formation seal fluid through the valves to their respective balloons 12b and 12c, and/or by lowering the pressure setting at which the valves 26 and 27 open. Referring to Figure 3, the formation sealing fluid begins to pass through the weak sections 47 in the central balloon 12a as the pressure and volume inside increase. As will be described in more detail below, the expandable ratchet rings also expand</p>

<p dir="rtl">20 To provide circumferential support after complete inflation of the central balloon 12A against the wall.</p>

The function of the weak sections 47 of the central balloon 12a is illustrated in Figures (4) through (6). Figure (4) represents an enlarged view of a weak section 47 of the central balloon 12a. As shown in Figure (5), A cross-sectional view taken along lines 5-5 in Figure (4), the balloon wall has a low thickness. As shown in Figure (6),

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Rupture of the weakened section 47 of the balloon wall allows formation sealing fluid to escape through the balloon wall 12a in order to seal the target area.

Referring again to Figure 2B, in another preferred embodiment, the inflation valves 26, 27, and 28 can be of different sizes and/or allow different flow equipment for inflation.

<p dir="rtl">5 Balloons 12B and 12C more quickly. The inflation valves 26, 27, and 28 are opened by the controlled explosive force of the chemical reaction, allowing the reaction products to displace the sealing fluid and for the balloons 12a, 12b, and 12c to displace the formation sealing fluid into the inflation container 24, and to inflate to their positions in contact with the wellbore wall 11 As best shown in Figure 13. The two balloons at the top of the well and at the bottom of the well, 12b and 12c, are tip balloons, which inflate faster than the balloon.</p>

<p dir="rtl">10 The central 12a provides stability to the entire installation while sealing the uphole and downhole gaps between the blow-off container 24 and the wellbore 11. Although the pressure-operated blow-off valves 26, 27 can open at the same time as the pressure-operated valve 28, they do not The expansion of the central balloon 12a is at the speed of the balloons at the top of the well and at the bottom of the well 12b and 12c.</p>

It should be noted that alternative valve arrangements, such as RFID tags, can be incorporated

<p dir="rtl">15 Pre-programmed radio frequency operated (RFID) and surface supplied pumped tags with electronically actuated valves of prior art, of the present invention by a person of ordinary experience in the art. However, pressure actuated valves are as described above In the present invention, the pressure valve is a conventional injection pressure valve such as those manufactured by Schlumberger and Co</p>

(Halliburton) 20

As noted above, openings 47 in the side wall of the center balloon body 12a will allow pressure-conditioned formation sealing fluid to pass from the inflation container 24 to the collar between the expanding balloon 12a and the wellbore wall, while also causing the balloon to inflate at a lower rate than the balloons at the top of the well. And down the well, 12B and 12C.

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The formation sealing fluid 25 is initially in the blowing container 24. As shown in Figure 14, the formation sealing fluid 25 is displaced into the blowing container through the blowing valves 26, 27, and 28 through a force or pressure produced by the reacting materials. Chemical 29 coming from the chemical container 34 above which is connected to it by means of a fluid. When it is displaced, both...

<p dir="rtl">5 The formation sealing fluid 25 and chemical reactants 29 inflate the balloons 12a, 12b, and 12c, and enter the collar through one or more of the holes 47 in the central balloon. Formation sealing fluid 25 may be any known suitable type that is compatible with and serves to seal a well for a given formation under prevailing conditions. The wellbore fluid originally present in Ring 19 will be displaced into the pores and fissures of the adjacent reservoir rock by Formation 25 plugging fluid as it enters Ring 19 of</p>

<p dir="rtl">10 Holes 47 in the central balloon 12A.</p>

As shown in Figure 16, after the central balloon 12a is inflated and the formation sealing fluid 25 is forced into the formation wall, the hot reaction products 29 will cause the central balloon 12a to burst at its outer boundary uphole and downhole, softening and melting against the wellbore wall. 11. A large portion of the central balloon 12a will be melted and will be in complete contact with the wall of the well after it is inflated to the point

<p dir="rtl">15 Al-Aqsa. The longitudinal portion of the central balloon is thus separated from being attached to the outside of the inflation container.</p>

Referring to Figure 14, the structure of the top-well and bottom-well balloons 12b and 12c is stronger than the structure of the center balloon 12a due to the number of weak sections 47 that are torn when the reaction occurs. The weak sections 47 in the center balloon 12a will also allow the wall sealing fluid to pass through Aj Azz

<p dir="rtl">20 ruptured and penetrates the wall behind the elastic polymer material of the central balloon 12a.</p>

Referring to the stage shown in Figure (15), as the central balloon 12a expands, it pushes the original wellbore fluid and the formation sealing fluid that was inside the blowing container 24 deep into the formation.

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At this stage of the process, the central balloon body 12a is fully exposed to the heat generated in the exothermic chemical reaction from the chemical container 34 directly above. As noted, the heat of the reaction product melts the central balloon 12a against the well wall and, at the same time, it will be maintained in position by the extendable ratchet rings 44 and supported 5 longitudinally by ligatures or rigid straps 42.

The balloons at the top of the well and at the bottom of the well, 12B and 12C, are not affected by the exothermic reaction because they are fully inflated at the beginning with the formation sealing fluid, and there is no rupture in any of those balloons that are sealed with collars from which the sealing fluid can emerge.

Referring again to Figure 16, after the wall sealing or adhesive application step 10, the pressure-conditioning fluid is pumped from the surface through the coiled tubes to rupture the two balloons.

Uphole and downhole 12b (not shown), and 12c to enable device recovery through production tubing 30.

After cutting the central tube 12a and bursting the balloons at the top of the well and the bottom of the well 12b and 12c, the coiled tubing can be withdrawn from the opening of the well 11 along with the remains of the central balloon, and the balloons at the top of the well and the bottom 15 of the well 12b and 12c, leaving the main part of the central balloon 12a in place for a tight seal.

Unwanted water area of ​​wellbore 11.

Referring to Figures (7) - (9), it is preferable that the central balloon be strengthened at least circumferentially and longitudinally by adding reinforcing components. For longitudinal stiffening, a number of, for example, four or more ligatures or The rigid reinforced tapes, in the polymeric material 20, are in a relationship spaced apart from each other around the outer border as shown in Figures No. (7) - (9).

For circumferential strength, an extendable ratchet ring 44 is positioned within the open-ended tube 45 that is fused to, or attached to the inner surface or circumference of the central balloon 12a. It is preferable to place a right-hand ratchet ring at either end of the central balloon 12A to securely hold it in position when extended against the wall above and below the target area. One can be provided

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or more rings with additional transverse latches depending on the longitudinal length of the target area to be covered by the central balloon 12a.

The extendable latch ring 44 consists of two metal rings 44a and 44b having overlapping teeth on the inward facing sides as best shown in Fig. 8. The teeth are generally uniform, but asymmetric, with each tooth having an angular slope. Moderate 46 on

one side, and a steep 48 slope on the other. The moderate angular slope 46 on one side allows the overlapping teeth to slide past each other during balloon expansion 12, and the steep slope 48 prevents the ring 44 from collapsing after balloon expansion 12, and maintains the ratchet ring 44 in the expanded configuration. As can be seen, and best shown in Figure 10 (8), the ratchet ring 44 is located in an open-ended flexible circular tube 45, the ends of which are

Slot 50 initially faces each other. The flexible tube 45 constrains the ratchet ring 44 and keeps the teeth of the ratchet ring 44 engaged at all times after expansion of the central balloon 12a. The opening 50 allows the tube 45 to extend the loop into the tube, such that the two facing ends of the tube opening move apart from each other.

<p dir="rtl">15 With reference to Figures No. (17) - (19), in another embodiment of the invention, an extendable wire support device 70 is used in order to keep the fully expanded central balloon against the wall of the wellbore. Figure No. (17) shows an embodiment that illustrates the use of a device The expandable wire stent 70, prior to the commencement of the chemical reaction described above, wherein neither the central balloon 12a nor the expandable wire stent device 70 are yet expanded by the passage of formation sealing fluids from the inflation container 24 to</p>

20 Central balloon 12A through pressure inflation valve 28.

As shown in the enlarged cross-section view of Figure 18, the expandable wire stent device 70 will be positioned between two grids 72a, 72b and embedded in the walls of the central balloon 12a. Similar to the embodiment shown in Figures 7-9. (, Additional longitudinal support may be provided by rigid reinforcement bands or straps 42 which are also integrated into the central balloon 25 strand 12a.

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Referring to Figure No. (19), once the chemical reaction is initiated as discussed above with reference to Figure No. (2b), the formation sealing fluid 25 is forced through the pressure-actuated inflation valves 26, 27, and 28, thus expanding the balloons 12a and 12b. , and 12c. As the central balloon 12a expands, the expandable wire support device 70 and the meshes 72a and 72b are also made

<p dir="rtl">5 The meshes 72a and 72b are of expandable material which expands when the balloon and wire stent device expand. Polyart and copolymer can be used from vinyl, polyethylene, and polypropylene. When the pressure in the central balloon 12a reaches a sufficient level, the formation sealing fluids 25 pass through the weak, ruptured sections 47 of the central balloon, having penetrated the formation into the target area 16. As in the embodiment described in Figure 15, once</p>

<p dir="rtl">10 Both the central balloon 12a and the extendable support device 70 fully expand against the wall surface, the heat of the reaction product softens and melts the center balloon 12a against the wall of the well, and it is held in position by the expandable wire support device 70 and is supported longitudinally by ligatures or rigid straps. 42 As shown in Figure No. (18).</p>

Referring to Figures (20)-(23), in an alternative embodiment of the invention, the two balloons at the top are replaced

<p dir="rtl">15 The well and downhole used to isolate the target area 16 with a dual inflatable padding system which includes an inflatable topwell padding 80a and a downhole inflatable padding 80b, each inflatable with wellbore fluid 31 by separate electric pumps 82a and 82b. The gaskets are made of a reinforced rubber composition for durability through repeated use of the assembly. Electrical wiring (not shown) extends from each of the pads to a structure above the well where control switches are provided</p>

<p dir="rtl">20 Pumps. Inflatable gaskets are well known in the art and can be adapted by someone with ordinary experience in the art for use in the configuration of the present invention.</p>

Figure (20) shows lowering the assembly using the double inflatable gasket system through the production pipes 30 through the coiled pipes (not built). The device is lowered until the container is aligned

<p dir="rtl">25 Inflatable 24 and central balloon 12a with target area 16. as described in relation</p>

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In Figures 2a and 2b, the circulation valve 32 (not shown) is kept open while the tool is lowered into the drill hole so that the wellbore fluids enter the coiled tubing, thus facilitating the spread of the assembly through the production tubing 30.

Referring to Figure No. (21), the inflatable pad is placed on top of well 80A and the electric pump

<p dir="rtl">5 Its 82a is located above the circulation valve 32. The inflatable packing is placed at the bottom of the well 80b and its electric pump 82b is located at the bottom of the blowing container 24.</p>

Figure No. (22) shows the inflation of the inflatable top-well and downhole pads 80a and 80b via the electric pumps 82a, 82b, which draw wellbore fluid 31 from the well mouth and discharge it under pressure to the inflatable pads 80a, 80b. When inflated, the pads expand higher 10 The uphole and downhole 80A, 80B are in safe contact with the borehole wall surface to keep the assembly in

Fixed position and in order to isolate the target area 16 from the borehole fluids above and below the assembly.

Referring to Figure No. (23), once the inflatable pads at the top of the well and the bottom of the well 80a, 80b have been inflated, the inflation of the central balloon 12a is initiated in the same manner as described above in relation to Figure No. (2b). The central balloon 12a is inflated by means of The reaction (not shown) that 15 pushes the formation dam fluids 25 out of the inflation container and into the balloon so that the weak sections 47 of the

The central balloon 12a, allowing the formation sealing fluids 25 to flow through the weak, torn sections 47 and penetrate the formation into the target area 16. The inflated central balloon 12a continues to expand and is softened and melted by the heat of reaction in the same manner as described above in connection with (Figure 12a). 15) so that the inflated central tube 12A that is in contact with the target area melts

<p dir="rtl">20 16, against the well wall, thus sealing the target area 16. In this model, a support is made</p>

The central tube 12a is against the wall of the well by one or more of the above-described structural elements such as straps or ties of high-tensile, rigid material 42, the extendable ratchet ring 44, and the expandable metal strut 70. The remnants of the central balloon are separated along circumferentially weak lines. .

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After sealing the target zone 16, the inflatable upwell and downhole gaskets 80a, 80b are emptied by electric pumps 82a, 82b, which draw wellbore fluid 31 from their respective gaskets and return it to the wellbore. Once the uphole and downhole inflatable pads 80a, 80b have deflated sufficiently, the device is removed from the wellbore through tubing.

5 Production 30 via coiled tubes 14.

The sequence of process steps can be summarized jointly with reference to drawings as follows:

Figure No. (1) shows the device in its initial state to be placed at the bottom of the well adjacent to the target area 16 in wellbore 11.

Figures (2a) and (2b) show the function of the timed circulation valve 32 that is kept open

<p dir="rtl">10 To facilitate placement of the device 10, while the tool is lowered into the drill hole such that the borehole fluid 31 enters the coiled tubing 14. Once the balloon 12 reaches the target area, the activated fluid reactant 33 is pressure-conditioned by the displacement fluid (not shown) From the surface to the coiled tubing to displace the wellbore fluids 31 through the timed circulation valve 32. Once the activated fluid reactant 33 reaches the depth of the circulation valve 32 and the wellbore fluids are displaced</p>

<p dir="rtl">15 31, the circulation valve 32 closes automatically. Additional displacement fluid is pumped into the coiled tubes 14 of</p>

surface in order to increase the pressure to a level sufficient to open a pre-set pressure-operated uphole inlet valve 36 as shown in Figure 10. When the inlet valve 36 opens, the activated fluid reactant 33 enters the chemical container 34 to produce the reaction with the substance or substances. Chemical 38.

<p dir="rtl">20 As shown in Figure 11, the fluid reactant 33 enters the chemical container 34 through the pressure inlet valve at the top of the well 36 to initiate the reaction. The reaction pressure causes the pressure outlet valve 40 to open, allowing the reaction products 29 to enter the blowing container. 24.</p>

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In Figure 12, the hot reaction products 29 enter from the chemical container 34 into the blow-off container 24 through the downhole pressure valve 40, displacing the formation sealing fluid 25 into the balloons 12. The reaction products 29 pass through the pressure-operated blow-off valves 26 , 27, and 28 and the complete sequential expansion of the balloon sections 12b and 12c, after which 12a expands as described in detail above 5 in the discussion of Figures (13) and (14). Initially, the balloon expands

The top of the well 12b and the balloon down the well 12c until they reach the wall surface and seal the adjacent collar, while stabilizing the entire device while completing the expansion of the central balloon 12a, and eventually melting and tearing it off to attach the remains to the wall of the well opening.

Figure No. (15) shows the path of the formation dam fluid 25 and reaction products 29 through the inflation valves.

<p dir="rtl">10 Pressure-actuated 28. Specifically, the reaction products 29 push the formation seal fluid 25 through the pressure-actuated inflation valves 28 and then through the vulnerable sections 47 of the balloon (not shown). The reaction products 29 follow the same path through the pressure-actuated inflation valves 28 and the vulnerable sections 47 (From the balloon not shown).</p>

Figure No. (16) shows the device being removed from the wellbore 11 through the production pipes 30 after it has been

<p dir="rtl">15 The wall is pasted and sealed with the melted balloon 120a and the end balloons 120b are torn off.</p>

120 EGP Note that the remaining parts of the end balloon 120b (not shown) and 120c, which are attached to the inflation container 24, are removed by the coiled tubes 14 (not shown).

Figure No. (24) represents a schematic view of another implementation of a balloon system which, in some implementations, forms part of the device shown in Figure No. (1) and delivers the formation sealing fluid to the area

<p dir="rtl">20 Targeted. Similar to the previously described balloon system, the balloon system shown in Figure 24 includes a container 2400 containing (e.g., filled with) formation sealing fluid 2414. In some implementations, three balloons are installed - one balloon at the top of the well 2402a, A center balloon 2402b and a bottom-well balloon 2402c are positioned on the outside of the container 2400, for example, by means of an adhesive where the top-well balloon 2402a is at the top of the well relative to the balloon</p>

<p dir="rtl">25 Central 2402b, which is the top of the well relative to the balloon at the bottom of the well 2404c. It can be done</p>

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The three balloons 2402A, 2402B, and 2402C are made of any suitable elastic thermoplastic expandable material, for example, a polymer, preferably natural or synthetic rubber. Different elastic and resilient materials can be used for each of the three balloons. Individual balloons can be produced with different wall thicknesses, different material properties and a means of attaching them to their support surface. It is the thickness of Grandfather Arn

<p dir="rtl">5 The flexibility, or sections of the walls of the balloons, is sufficient to allow extension and safe contact with the adjacent wall surface.</p>

At the top of the well above the container 2400 is a compressed gas container 2410 containing (e.g., filled with) a flammable compressed gas. Alternatively or additionally, the compressed gas container 2410 can be any container containing (e.g. , be full

<p dir="rtl">10 (b) A solid explosive that can be ignited to release rapidly expanding gas at an elevated temperature. A fire ignition system 2408, described below, is coupled to the uphole end of the compressed gas container 2410. The downhole end of the compressed gas container 2410 is coupled The uphole end of container 2400 is fluidly shaped such that, upon expansion, gas in the compressed gas container 2410 can flow downhole toward container 2400. Container 2400 and a container are coupled</p>

<p dir="rtl">15 The compressed gas 2410 is fluidized by a pressure-operated valve 2406. The valve 2406 is configured to open when the pressure on the compressed gas container 2410 reaches a predetermined value. The open valve 2406 opens a fluid passage from the compressed gas container 2410 to the container 2400.</p>

The 2400 container includes multiple balloon inflation ports; In some implementations, the number of ports is set as a number

<p dir="rtl">20 Balloons. For example, an upwell port 2404a, a center port 2404b, and a downwell port 2404c are configured on the container 2400 to inflate the uphole balloon 2412a, the center balloon 2412b, and the downhole balloon 2412c, respectively. Container 2400 includes a float piston 2405 at the upwell end of container 2400, e.g., immediately below the well for valve 2406. The float piston 2405 rests on shear pins 2412 attached to an inner wall of container 2400</p>

<p dir="rtl">25 It protrudes diagonally inward. In response to the downhole movement of the float piston 2405, it can</p>

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Shear bolts 2412 open the ports and are sheared to allow movement of the float piston 2405 downhole. The balloon system can be placed with tubes 2406 and used to induce permanent scale damage to the surface and adjacent area of ​​the unwanted aqueous area as will be described later.

<p dir="rtl">5 The balloons described in reference to Figure 24 are inflated by a controlled explosion that ignites the compressed flammable gases in the compressed gas container 2410. The ignited gas increases the pressure in the compressed gas container 2410 to a predetermined value that causes the pressure valve 2406 to open. Fluid passage from the compressed gas container 2410 to the container 2400. The combusted gas exerts a downhole force on the float piston 2405. The force causes the screws to</p>

<p dir="rtl">10 Shear 2412 The ports open and are sheared, allowing the piston 2405 to travel toward the downhole end of the container 2400. The open ports cause the formation sealing fluid 2414 to inflate the balloons until they contact the outside surface of the balloons and pressurize an inner wall of the well. As described later, in some implementations, the rate at which the three balloons expand can be controlled so that formation sealing fluid 2414 is sprayed onto the well wall. The burning gas heats up and melts the balloons against the wall of the well.</p>

<p dir="rtl">15 Thus, part of the well is closed.</p>

In some implementations, the three balloons may inflate at different times, at different rates, or both. For example, the upwell and downhole balloons 2402b and 2402c may first inflate to provide a tight seal against the well wall at either end of the central balloon 2402b, thus acting as barriers to the formation sealing fluid 2414. This independent fluid-tight portion will allow

<p dir="rtl">20 By pushing the formation sealing fluid 2414 deep into the formation under the pressure that is produced by the rapid expansion of the combustible combustible gas. The 2402B central balloon has multiple weak areas that will rupture in the early stages of inflation. The presence of weak zones, spots, or holes can provide a slower rate of inflation of the center balloon 2402b relative to the upwell balloon 2402a and the downwell balloon 240c that do not have zones, spots, or holes.</p>

<p dir="rtl">25 Weak. Because the balloons inflate at different rates, each balloon will originate at the top of well 2402a</p>

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The downhole balloon 2402c is an independent part within the formation sealing fluid 2414 that will leak from the central balloon 2402b. After rupture, the weakened wall will allow formation sealing fluid 2414 to pass from container 2400 while allowing balloon 2402b to inflate and expand diagonally into an annular space or independent annular segment defined by adjacent balloons, i.e., two balloons 2402a.

<p dir="rtl">5 And 2402 EGP. Alternatively or additionally, the center balloon 2402b may include a perforation</p>

It can retard the rate at which the central balloon 2402b expands relative to either or both the upwelling balloon 2402a and the downhole balloon 2402c. In addition, the perforation can allow formation plugging fluid 2414 to be sprayed onto the well wall.

Figure No. (25) is a process flow chart for an example of a process 2500 for sealing a non-configuration area

<p dir="rtl">10 Desirable in the well wall. The process 2500 may be performed using the balloon system described by reference to Figure 24. Initially, the balloon system may be lowered into a wellbore using coiled tubing in an equipment-less process. For example, using coiled tubing 2412, the balloon system may be lowered into a well to The part of a well through which unwanted fluids leak into the well bore.</p>

<p dir="rtl">15 At 2502, an explosion can be initiated in a container carrying an explosive material, e.g., container 2410. The explosion can expand the gas in the container causing the expanded gas to flow into another container, e.g., container 2400 carrying a formation sealing fluid configured to prevent Flow through the configuration. For example, an explosion can be initiated by firing a firing mechanism (such as a percussion gun or other firing mechanism) causing the explosive material (such as compressed flammable gas) to ignite.</p>

<p dir="rtl">20 (or solid explosive or other explosive material). As the gas expands, the pressure on container 2410 increases to meet a limit pressure which opens at pressure valve 2405.</p>

At 2504, the expanding gas is made to flow into the container holding the formation sealing fluid. For example, when the pressure on container 2410 exceeds the limit pressure at which pressure valve 2405 opens, the expanding gas flows into the container holding the formation sealing fluid.

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At 2506, the formation sealing fluid is made to flow into a balloon attached to the outside of the container. For example, the buoyancy piston 2405, positioned at one end of the container 2400 through which the expanding gas enters the container 2400, is pushed toward the opposite end by a force of the gas. The float piston 2405 pushes the shear pins 2412, opening the ports in the container and shearing the shear pins 2412.

<p dir="rtl">5 The buoyancy piston 2405 flows the formation sealing fluid out of the ports in the container (e.g., port 2404b) and into the balloon (e.g., the center cylinder 2402b). The balloon is inflated while the formation sealing fluid flows into the balloon.</p>

At 2508, the formation capping fluid is made to flow into part of the well. Figure 26 is a schematic diagram of the center balloon 2402a with hole 2600. For example, formation seal fluid flows

<p dir="rtl">10 Through hole 2600 to the inner wall of the well. In another example, the central balloon 2402b can include vulnerable sections prepared to rupture when the central balloon 2402b inflates. Combinations of perforation (or holes) and weak sections are also possible.</p>

At 2510, the portion of the well is sealed by dissolving the inflated balloon. Figure No. (27) represents a schematic view of inflated balloons touching the wall of the well. As previously described,

<p dir="rtl">15 Formation sealing fluid on the well wall. The center balloon 2402b is then inflated to contact the wall, thus confining the formation sealing fluid between the well and the center balloon 2402b.</p>

In some implementations, upwell balloon 2402a and downwell balloon 2402c may be attached to container 2400 as previously described. Both the uphole balloon 2402a and the downhole balloon 2402c expand faster than the center balloon 2402b when formation sealing fluid flows into the balloon above

<p dir="rtl">20 The well 2402a and the downhole balloon 2402c through the uphole port 2404a and the downwell port 2404c, respectively. Figure 27 shows an inflated uphole balloon 2402a and an inflated downhole balloon 2402c when the buoyancy piston 2405 is pushed to the opposite side of the container 2400. Because the inflated uphole balloon 2402a and the inflated downhole balloon 2402c do not include holes for formation sealing fluid to flow through , forming the balloon at the top of the inflated well 2402a and the balloon at the bottom of the well</p>

<p dir="rtl">25 2402C Inflated top-well and bottom-well seals for the central balloon 2402B. The tightness</p>

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This closure creates a flow channel for the formation plugging fluid to be directed to the portion of the well near the central balloon 2402b. In some implementations, the uphole balloon 2402a and the downhole balloon 2402c can be fluidly isolated from the center balloon 2402b such that the formation sealing fluid does not flow from either the uphole balloon 2402a or the downhole balloon 2402c to the center balloon 2402b. in

<p dir="rtl">5 In some implementations, the top-well balloon 2402a and the bottom-well balloon 2402c can be fluidly isolated from each other. In some implementations, the upwell balloon 2402a and the downhole balloon 2402c may be fluidly coupled so that they share a fluid path which flows through the formation sealing fluid to each balloon.</p>

Referring to Figure No. (26), at 2510, part of the well is sealed by dissolving

<p dir="rtl">10 Inflated balloon. Figure 28 represents a schematic view of the melt balloons that prevent leakage of formation sealing fluid into the well wall. After the inflated balloon contacts the inside wall of the well, the heat from the expanding gas can melt the balloon (for example, melt balloon 2702a), thus separating Balloon off the container 2400 and keep the dissolved balloon against the inner wall of the well. In some implementations, ratchet rings may be implemented (e.g., ratchet rings 44 described).</p>

<p dir="rtl">15 advance) to expand with the balloons to provide circumferential support following full inflation of the central balloon versus</p>

The wall. In this way, the part of the well through which unwanted fluid leaks is sealed, in an equipment-less operation.

In the representative balloon system described in reference to Figure 24, the direction of movement of, for example, the expanding gas and buoyancy piston is described as the downhole direction. A system can be implemented

<p dir="rtl">20 The analog balloons are alternately positioned so that the direction of movement is toward the top of the well. For example, the balloon system can be reversed such that the firing system 2408 is at the downhole end of the balloon system, and the compressed gas container 2410 is downhole relative to the container 2400 holding the formation plugging fluid 2414. Alternatively, the balloon system can be implemented horizontally or in Angular orientation relative to the surface on which the well is formed.</p>

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In some implementations, multiple balloon systems may be implemented, for example, at different depth levels from the surface at which the fluid seeps into the formation. In such implementations, each balloon system may be activated using chemicals as previously described or using explosive materials as previously described. Alternatively, one or more of the multiple balloon systems may be activated

<p dir="rtl">5 using chemicals, while the remaining balloon systems can be activated using explosive materials.</p>

By implementing the techniques previously described in reference to Figures 24-28, the need to cause chemicals (or other materials) to flow from a surface to inflate the balloons can be avoided. Alternatively, the firing system and explosive can be attached to the container 2400 at Surface, can be cut

<p dir="rtl">10 The entire system balloons to the well. In such a balloon system, all the components needed to inflate the balloons are placed inside the well, and do not need to be transported down the well from the surface. Techniques are also described herein in the context of sealing a portion of a well to prevent unwanted fluid flow. Similar techniques can be used to seal parts of a well for other purposes as well.</p>

The method and system contained in the present invention are described above and in the accompanying drawings; however,

<p dir="rtl">15 Modifications derived from this description will be obvious to those with ordinary experience of the art and the scope of protection for this invention will be determined by the following claims.</p>

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