RU2688807C1 - Compensator of thermobaric changes of tubing string length - Google Patents

Abstract

FIELD: oil and gas industry.SUBSTANCE: invention relates to oil and gas industry and can be used as part of process equipment for compensation of thermobaric changes of tubing string length. Compensator for thermobaric changes in the length of the tubing string includes an external pipe having the possibility of being connected to the casing string of the tail pipe of the well, an internal pipe located coaxially in the external pipe, as well as sealing elements. Outer and inner pipes are installed so that annular cavity is formed between them and attached to each other. Compensator is equipped with an intermediate pipe having the possibility of connection to the tubing string and installed in the said annular cavity with the possibility of axial reciprocating movement and with gaps relative to the inner surface of the external pipe and external surface of the internal pipe. On external and internal surfaces of external pipe there are stops having the possibility of contact by one end with support coupling, fixed on casing pipe of well shank, and by another end – with compression sealing elements, one of which is located on external surface of external pipe, and other is between external and intermediate pipes, wherein in each said clearance, coaxially to each other, pre-compressed sealing elements and sealing elements having a possibility of compression are arranged.EFFECT: providing compensation of considerable thermobaric length changes of the tubing string clones with the heat-insulating coating and providing tightness of disconnection of the under-packer zone of the well from the above-packer zone of the well.4 cl, 4 dwg

Description

The invention relates to the oil and gas industry and can be used in the composition of the process equipment to compensate for thermobaric changes in the length of a tubing string with a thermal insulation coating (TYPE) when pumping a working exposure agent (PAB) into the reservoir and removing it from the productive reservoir of the target product.

At present, oil-producing companies have begun to develop oil-bearing shale formations, in particular, such as the Bazhenov formation and the Domanik formation, as well as deep-seated (up to 5,000 meters) heavy hydrocarbons. The use of so-called thermochemical technologies based on the injection of a tubing with a TYPE into a productive layer of PAB, which has high temperatures (up to 800 ° C) and pressure (up to 60 MPa), is considered very promising for their development.

With the implementation of such technologies, when passing through the tubing under high pressure of high-temperature PAB, the overall tubing length, as a result of their heating, is significantly extended.

So, for example, when pumping a high-temperature RAV into the productive layer along a tubing string made of INCONEL 740H alloy, when they are heated, on average (uniformly along the entire tubing length) to a temperature of 520 ° C, the tubing string section is 3000 meters long, linearly it is extended by 21.84 meters, and when sampling from a productive layer of a less high-temperature water-oil emulsion having a temperature of 280 ° C (on average, over the entire length of the tubing), the same section, 3000 meters long, is linearly extended by 11.34 meters or linearly shortened by 10.5 meters relative to its linear elongation Eniya when pumping RAV (21.84 m - 11.34 m = 10.5 m).

Thus, in the process of using thermochemical technologies when cycling high-temperature PAB on the reservoir and the selection of oil-oil emulsion from the reservoir, having (compared to the PAB temperature) significantly lower temperature, the tubing inside the casing, cyclically change its length.

Such thermal linear deformations of the tubing lead to periodic reciprocating movement of the packer along with the tubing string along the inner surface of the casing, which very often leads to a violation of the tightness of separation of the subpacker and nadpakerny zones of the well due to its overflow from the subpacker zone of the well in nadpakternuyu, and, as a consequence - to reduce the pressure in the sub-pakernoy zone of the well.

The above circumstances reduce the effectiveness of the use of thermochemical technologies in the development of oil shale formations and the development of heavy hydrocarbon deposits, in particular, deep-seated ones.

One of the ways to solve these problems is the use of devices installed in the tubing string, compensating for changes in the tubing length - tubing compensators caused by pressure and temperature.

The compensators used for these purposes do not differ in a variety of designs.

So, for example, a compensator for thermobaric changes in the length of a tubing string is known, comprising a body made of two interconnected by means of a sleeve coupling, a movable rod made of two branch pipes interconnected by a sleeve, which is made with the possibility of translational movement in the body the spring case, the end sleeve is screwed on the lower part of the movable rod, which is made with the possibility of translational motion in the case; compensating stroke of the compensator, and from below - a sub with a hole and a groove for the output of an electric or hydraulic line, which is used to connect to the tubing string and on which the casing is screwed to protect the electric or hydraulic line, and the electric or hydraulic line is made in the form of a spiral and laid inside the case and a movable rod, while the movable rod is made with the possibility of translational motion in the upper sub and the housing coupling.

(see RF patent for useful model No. 174333, class E21B 17/07, 2017).

As a result of the analysis of the known compensator, it should be noted that its design does not compensate for significant thermobaric linear deformations of the tubing string, and also does not imply protection of the subpacker zone of the well from the over-packer.

Known compensator thermobaric changes in the length of the column of pipes, made of standard pipes and includes a housing consisting of two parts - the lower and upper. In the lower part of the body there is a rod, on which a spring of compensation of the stroke of the tubing down is mounted, limited on one side by a slip-fit coupling, and on the other by a nut. The linear dimensions, the spring travel and the working clearance between the coupling and the lower limiting nut can be constant with a power reserve, or selected from the intended downward movement of the pipe string. In this case, the compensator is connected to the column pipe by means of a pipe, which is connected by means of a coupling to a rod. A spring of compensation of the stroke of the pipe string upwards is fastened on this rod, limited by nuts, wrapped in the lower and upper parts of the body. To eliminate sticking and spring sticking, they are equipped with spacer rings. In the upper part of the body there is a coupling with a sliding fit, which connects the rod with the upper branch pipe, the course of which is limited by nuts, wrapped in the upper part of the body. The linear dimensions, the spring travel and the working clearance between the coupling and the upper limiting nut can be constant with a power reserve or selected from the intended upward movement of the pipe string. The connecting pipe connecting the compensator to the column pipe connected via the sub is wrapped in the top nut.

When the compensator is in operation, by means of the deformation of the springs, the stroke of the pipe string is compensated up or down.

(see RF patent №2566352, CL Ev21B 17/07, 2015).

As a result of analyzing the design of a known compensator, it should be noted that its drawbacks are large dimensions, especially axial ones, since compensation of compression of the pipe string and its expansion is provided by different design modules, which also complicates the design of the compensator, the location of the springs outside the housing leads to corrosion and emergency, while the spring travel is small, which does not allow the use of a compensator to compensate for significant thermobaric deformations of the pipe string.

Known axial compensator, consisting of a core body, which is rigidly connected by thread with a nipple, collet, fastened to the body, and the sleeve. The compensator also contains shear screws and a split retaining ring. The threaded petals of the collet engage with a thread made on the core. They are locked with a sleeve, which is fixed to the core with shear screws located in its radial holes.

The cutting retaining ring is made in the form of a ratchet, has on the inner surface a series of teeth that interact with counter-teeth located on the outer surface of the core. This allows the ring to move with the sleeve over the core in only one direction, preventing the sleeve from returning to its original position.

The core section in contact with the nipple and the body has faces on the inner surface, due to which torque is transmitted from the tubing string to the nipple by means of response faces on its outer surface. These faces are located along the entire stroke of the core relative to the nipple, which allows you to transfer the rotation to the equipment located below the compensator. The compensator also has a stop for the sleeve, made in the form of a nut, screwed on the core.

The compensator is lowered into the well with other equipment on the tubing string.

When an overpressure compensator is created in the internal cavity, equal to the pressure of its opening, due to the difference in cross-sectional areas of the upper and lower parts of the sleeve, the resulting force acting on the sleeve is directed upwards. This leads to the cut of the screws and the displacement of the sleeve with a split retaining ring up the core to the extreme upper position until it stops.

As a result of movement of the sleeve, the threaded ends of the collet lobes, which is connected to the housing, are released. This creates the possibility of moving the core over the nipple with the housing.

Under the action of the tensile load that occurs in the tubing string when an overpressure is created in its internal cavity, to actuate the equipment with hydraulic control, the threaded ends of the collet lobes are elastically unclenched and the core moves along the nipple. As a result, the compensator telescopically opens, increasing its length, and thus compensates for the amount of stretching of the tubing string. This allows you to remove stresses arising in the tubing tubing.

(see RF patent №2558833, CL Ev21B 17/07, 2015).

As a result of the analysis of the performance of this compensator, it should be noted that it is characterized by the complexity of the design, and, consequently, low reliability, as well as a slight axial stroke when compensating for temperature and pressure deformations.

Known thermal compensator containing coaxially located and forming a telescopic connection of the outer and inner pipes, seals in the form of a gland assembly, a threaded bushing, a guide bushing and a key.

The guide sleeve is rigidly fixed inside the outer pipe with a thread. The key is installed in the groove of the guide sleeve and connects the latter with the inner tube. The groove under the key in the inner tube is made of such length to ensure the expansion of the compensator to a predetermined stroke. The key connection ensures the transmission of torque between the inner and outer tubes. In order to avoid unwinding of the guide bush, the threaded connection of the latter with the outer pipe is locked. The end surface of the threaded sleeve is made with protrusions, and the end surface of the outer pipe facing it is provided with depressions corresponding to the protrusions of the threaded sleeve, with the possibility of the protrusions entering the hollows. This embodiment of the end surfaces of the threaded sleeve and the outer pipe provides the ability to periodically tighten the seals of the stuffing box to ensure the tightness of the gap between the outer and inner pipes.

(see RF patent №2176304, CL Ev21B 17/07, 2001) - the closest analogue.

As a result of the analysis of the known thermal compensator, it should be noted that the use of the end gland seal for sealing the gap between the outer and inner pipes with the possibility of its periodic tightening does not ensure its reliable sealing, especially when exposed to high-temperature PAB under high pressure. In addition, this thermal compensator is not designed for use on tubing strings, which are characterized by significant axial thermobaric deformations during operation.

Thus, from the current state of the art, no compensators for thermobaric deformations of tubing strings having a relatively small diameter have been identified that could work effectively under conditions of high temperatures (up to 800 ° C) and high pressures (up to 60 MPa), while simultaneously guaranteeing leak tightness underpacker and overpacker zones of the well.

The technical result of the present invention is to develop a compensator for thermobaric changes in the length of a tubing string with a TYPE, which compensates for significant thermobaric variations in the length of a tubing string with a TYPE when pumping a high-temperature PAB through a productive layer under high pressure, as well as when selecting an oil-water emulsion from a productive layer while ensuring tightness of separation of the sub-packer zone of the well from the above-packer zone of the well,

This technical result is ensured by the fact that in the compensator for thermobaric changes in the length of the tubing string containing the outer tube, which can be connected with the casing tube of the countersink well, the inner tube located coaxially in the outer tube, as well as sealing elements, is new that the outer and inner pipes are installed with the formation of an annular cavity between them and fastened with each other, and the compensator is equipped with an intermediate pipe having The connections with the tubing string and the one installed in the said annular cavity with the possibility of axial reciprocating movement and with gaps relative to the inner surface of the outer pipe and the outer surface of the inner pipe, on the outer and inner surfaces of the outer pipe are installed stops that can be contacted by one end with the basic coupling, mounted on the casing of the well shank, and the other end - with sealing elements that can be compressed I, one of which is placed on the outer surface of the outer pipe, and the other between the outer and intermediate pipes, wherein, in each of the above-mentioned gap, are pre-compressed sealing elements and sealing elements that have the possibility of compression, all sealing elements mainly made of basalt fiber having a fiber diameter of 0.5 to 3.5 μm, corrugations are made on the surfaces of pipes in contact with the sealing elements, and metal parts of the compensator are made claimed alloy INCONEL 740N.

The essence of the claimed invention is illustrated graphic materials on which:

- in fig. 1 - compensator in the initial position, placed inside the secret column, prior to the injection of the PAB into the reservoir, a longitudinal section;

- in fig. 2 - compensator in the working position, placed inside the secret column, before being pumped into the productive layer RAB, longitudinal section;

- in fig. 3 - compensator placed inside the countersunk column, in the process of PAB injection into the reservoir, longitudinal section;

- in fig. 4 - compensator, placed inside the secret column, in the process of selection from the reservoir oil-water emulsion, longitudinal section.

In the description given below, the positions denote the following structural elements of the compensator declared as an invention.

1. Casing pipe of a secret column of a well.

2. Casing liner shank.

3. Supporting coupling for connecting the casing of the head of the well string 1 and the casing 2 of the shank of the well.

4. The annular groove support coupling 3.

5. Sealing element supporting coupling 3.

6. Corrugated area on the inner surface of the casing 1.

7. Emphasis.

8. The head of the stop 7.

9. Sealing element.

10. Emphasis.

11. Lock stop 10.

12. External pipe.

13. Corrugated area on the outer surface of the pipe 12.

14. The lower grooved area on the inner surface of the pipe 12.

15. At stupas of the basic connecting coupling 3.

16. Emphasis.

17. The head of the stop 16.

18. Lock the head of the stop 17.

19. Sealing element.

20. Emphasis.

21. The ring.

22. Pre-compressed sealing element.

23. Precompressed sealing element.

24. Emphasis.

25. Emphasis.

26. Sealing element.

27. Sealing element.

28. The pipe is internal.

29. The upper grooved area on the inner surface of the pipe 12.

30. Corrugated area on the inner surface of the pipe 28.

31. Connecting element.

32. 32.1 and 32.2. Locking rings.

33. Clamps fixing rings 32.1. and 32.2.

34. Pipe intermediate.

35. The ring.

36. The ring.

37. Tubing with a type.

38. Tubing holder.

39. Tubing holder.

40. High-temperature high-pressure PAB.

41. Water-oil emulsion.

The well in which it is supposed to install the tubing string with a TYPE, compensation for thermobaric changes in the length of which is necessary to ensure, is equipped with a casing 1 of a secret well column (hereinafter referred to as casing 1) and a casing 2 of a well shank (hereafter referred to as casing 2), sealed together with another supporting coupling 3. To ensure the tightness of the connection in the annular groove 4 of the coupling 3 is placed a seal 5.

On the inner surface of the casing 1 has a corrugated section 6.

In the cavity of the casing pipe 1 is placed an annular stop 7, the lower one (hereinafter the terms “lower” and “upper” should be understood as located in the plane of the drawing) with its end face, which has the possibility of contact with the seal 5 and having a flange-shaped head portion 8 .

The compensator is equipped with an annular sealing element 9 placed in the cavity of the casing 1, with its lower end in contact with the head 8 of the stop 7, and the upper with the stop 10 mounted on the outer surface of the outer pipe 12 and in contact with the corrugated section 6 of the casing 1 by means of the latch 11. The structural elements 7, 8, 9, 10, 11 form an external heat-resistant high-pressure packer.

The sealing element 9 is worn on the outer surface of the outer pipe 12, having a corrugated section 13 on the outer surface, with which the sealing element 9 contacts, and on the inner surface is a lower corrugated section 14. The stop 7 is mounted on the outer surface of the outer pipe 12.

On the inner surface of the supporting coupling 3, a step 15 is formed, with which the lower part of the ring stop 16 is capable of contact, the flange-shaped part 17 of which is fixed in the cavity of the pipe 12 by means of a clamp 18 and a sealing element 19 is in contact with the outer surface with the lower corrugated section 14 of the pipe 12. The upper end of the sealing element 19 is in contact with the ring stop 20. The structural elements 16, 17, 18, 19, 20 form an internal heat-resistant high packer pressure.

The outer pipe 12 with its upper end, by means of a connecting element 31, for example, a flange, is fastened (for example, by welding) to the upper end of the inner pipe 28. The pipes 12 and 28 fastened to each other are located relative to each other coaxially to form a cavity between them.

The pipe 12 has an upper corrugated section 29 on its inner surface, and a pipe 28 on its internal surface has a corrugated section 30.

In the cavity formed by the pipes 12 and 28, with gaps relative to the inner surface of the pipe 12 and the outer surface of the pipe 28, and with the possibility of axial reciprocating movement relative to them is placed an intermediate pipe 34.

In the space (in the gaps) between the pipe 34 and the pipes 12 and 28 are placed the sealing elements 26 and 27 in contact with the corrugated sections 29 and 30 of the pipes 12 and 28 and supporting the bottom ends on the ring stops 24 and 25. The stop 24 is fixed on the outer surface the inner pipe 28, and the stop 25 on the inner surface of the outer pipe 12.

The upper ends of the sealing elements 26 and 27 are in contact with the locking rings 32.1 and 32.2 fixed to the pipes 12 and 28 by means of clamps 33, which are not fixed to the outer and inner surfaces of the intermediate pipe 34. From above, the outer and inner surfaces of the pipe 34 are fixed by welding rings 35 and 36, which, in contrast to the locking rings 32.1 and 32.2, attached to the pipes 12 and 28 by means of the clamps 33, always reciprocally move together with the intermediate pipe 34.

At the bottom of the pipe 28 is fixed ring 21.

In the gaps formed by the pipes under the sealing elements 26 and 27, pre-compressed sealing elements 22 and 23 are placed between the stop 20, the ring 21 at the bottom and the stops 24 and 25 at the top, coaxially with the sealing elements 26 and 27.

On the lower part of the pipe 34 there are holders 38 and 39, designed to bond it to the tubing with TYPE 37 by welding. To prevent distortions when binding the pipe 34 with tubing with TYPE 37 and to increase the reliability of bonding, not one but two holders 38 and 39 are used.

The metal parts of the compensator are most expediently manufactured from INCONEL 740H alloy, which belongs to corrosion-resistant alloys and is highly resistant to the effects of PAB.

The sealing elements of the compensator can be made of ultrafine basalt fiber having a diameter of 0.5 to 3.5 μm or of a microporous material MICROTHERM made of fumed silica and having an initial density of 320 kg / m ³ .

The seals made of these materials are able to maintain their performance at temperatures up to 1150 ° C.

The corrugated sections made on the structural elements of the compensator increase the tightness of the contact connection “the corrugated surface of the structural element of the compensator - the surface of the sealing element in contact with it” and also ensure that the sealing elements in contact with them are in a predetermined position during operation of the compensator.

Standard spring clamps are used as clamps.

The use of pre-compressed sealing elements 22 and 23 in the construction of the compensator, in combination with the sealing elements 26 and 27, ensures reliable tightness of the compensator prior to the start of the supply of PAB 40 through the tubing with TYPE 37, during its feeding through the tubing with TYPE 37, as well as during selection for tubing with TYPE 37 water-oil emulsion 41.

The Assembly of the compensator is as follows (Fig. 1).

1. To the lower end of the inner pipe 28 is fixed, for example, by welding, the ring 21.

2. On the outer surface of the inner pipe 28 is put on until the stop in the ring 21 pre-compressed sealing element 22.

3. On the outer surface of the inner tube 28 by means of welding fix the stop 24.

4. On the outer surface of the inner pipe 28 to contact with the stop 24 put the sealing element 26.

5. On the outer surface of the inner tube 28 on top of the sealing element 26 put the retaining ring 32.1 and fix it with the latch 33.

6. On the assembly (pp. 1-5) put on the intermediate pipe 34.

7. On the outer surface of the intermediate pipe 34 put the head part 17 upward stop 16.

8. The sealing element 19 is put on the outer surface of the intermediate pipe 34 up to the stop in the head part 17 of the stop 16.

9. On the inner surface of the intermediate pipe 34 above the fixing ring 32.1, the ring 36 is fixed by welding.

10. The stop 20 is attached to the inner surface of the outer pipe 12 by welding.

11. In the outer tube 12 is inserted before the contact of the lower end with the stop 20 pre-compressed sealing element 23.

12. On the inner surface of the outer pipe 12, above the sealing element 23 by welding attach the stop 25.

13. In the outer tube 12 is inserted before contact with the stop 25, the sealing element 27.

14. In the outer tube 12 above the sealing element 27, insert the locking ring 32.2 and fix it with the clamp 33.

15. Assembly (PP 10-14) put on the intermediate pipe 34, while the sealing element 19 is located between the outer and intermediate pipes.

16. On the outer surface of the intermediate pipe 34 above the fixing ring 32.2, a ring 35 is attached by welding.

17. To the upper ends of the pipes 28 and 12 by welding, fasten the connecting element 31, fastening them with each other.

18. On the inner surface of the intermediate pipe 34 by means of welding holders 38 and 39 are attached.

19. On the outer tube 12 is put on the head part 8 upward stop 7.

20. On the outer tube 12 on top of the stop 7 before contact with its head part 8 wear sealing element 9.

21. On the outer surface of the pipe 12 by welding fix the stop 10.

The compensator is assembled and ready to use. In the assembled position of the compensator, the sealing element 9 is in contact with the corrugated surface 13, the sealing element 19 - with the corrugated surface 14, the sealing element 26 - with the corrugated surface 30, the sealing element 27 - with the corrugated surface 29.

For use, the compensator is delivered to the well.

1. Holders 38 and 39 are fastened to the tubing string with TYPE 37.

2. The tubing string with the TYPE and the compensator is lowered into the lower part of the casing 1 until the stop 7 enters the annular groove 4 of the support coupling 3 and seals the sealing element 5 of the support coupling 3, and the support 16 does not sit on the ledge 15 supporting coupling 3.

3. Next, the tubing string with type 37 and compensator is lowered into the well until (Fig. 2), when the stop 10 seals (compresses) the sealing element 9, and the stop 20 seals (compresses) the sealing element 19, while the clamp 11 fixes the stop 10 in the compressed position, and the latch 18 fixes the stop 17.

4. Next, tubing with TYPE 37 is injected into the productive layer of high-temperature high-pressure PAB 40 (Fig. 3.), with the result that tubing with TYPE 37 is linearly extended, and fixing rings of the compensator 32.1. and 32.2., pressed down by the rings 35 and 36, compress the sealing elements 26 and 27. In this case, the retainers of the retaining rings 33 fix the retaining rings of the compensator 32.1. and 32.2 over compressed sealing elements due to contact with grooved surfaces 29 and 30. When pumped into the reservoir RAV, all sealing elements of the compensator are in the maximum possible compressed (compressed) state (the density of compressed ultrathin basalt fiber can reach 2000-3000 kg / m ³ ) and, thus, reliably isolate the borehole zone located above the compensator from getting into it a high-temperature high-pressure PAB 40 from the borehole zone located below the compensator.

5. When selecting a water-oil emulsion 41 from the productive layer (FIG. 4), the temperature of which is lower than the temperature of the high-temperature PAB 40, the tubing with TYPE 37 is shortened linearly, but all the sealing elements of the compensator remain in the maximum possible compressed (compressed) state account of the work of clamps 11, 18 and 33 of the compensator. So, in particular, for example, when selecting a water-oil emulsion fixing rings 32.1. and 32.2. fixed by clamps 33 and, therefore, the sealing elements 26 and 27 are not expanded and remain in a compressed state, which ensures reliable isolation of the well zone, located above the compensator from getting into it high-temperature high-pressure PAB 40 from the well zone, below the compensator.

To ensure reliable tightness of the gap between the casing 1 and the outer surface of the outer pipe 12 used external heat-resistant high-pressure packer, sealing element 9, which during operation of the compensator is in a compressed position and reliably closes the gap between the casing 1 and the outer surface of the outer pipe 12.

To ensure reliable tightness of the gap between the outer tube 12 and the intermediate tube 34, an internal heat-resistant high-pressure packer is used, the sealing element 19, which is in a compressed position during operation of the compensator and reliably seals the gap between the outer tube 12 and the intermediate tube 34 in their lower part.

To ensure reliable tightness of the gap between the inner pipe 28 and the intermediate pipe 34. and in addition to the sealing element 19, the gap between the outer and intermediate pipes 12 and 34, precompressed sealing elements 22 and 23, as well as compressible sealing elements 26 and 27 are used that allows you to reliably seal these gaps in the process of compensating for thermobaric deformations of the tubing string, that is, in the process of moving the pipe 34 relative to the pipes 12 and 28.

Thus, the design of the compensator provides compensation for significant thermobaric linear deformations of the tubing string with a TYPE in the process of pumping high-temperature PAB under a high pressure into the reservoir, as well as in the process of selecting an oil-water emulsion from the reservoir with guaranteed preservation of leak-tightness of uncoupling the subpacker zone of the well from the nadpaknernoy zone wells.

The scope of the rights claimed in the present invention is not limited to the description of the specific implementation of the compensator disclosed in the application, but extends to its various modifications, including modifications to the design elements, their connections, as well as seals and their materials, therefore, the present invention should be considered as extending to any such modifications within the stated rights.

Claims (4)

1. Compensator thermobaric changes in the length of the tubing string, containing the outer pipe, having the ability to connect with the casing of the secret column of the well, the inner pipe located coaxially in the outer pipe, and sealing elements, characterized in that the outer and inner pipes are installed with the formation of an annular cavity between them and fastened with each other, and the compensator is equipped with an intermediate pipe, having the ability to connect with the tubing and the column in the annular cavity with the possibility of axial reciprocating movement and with gaps relative to the inner surface of the outer pipe and the outer surface of the inner pipe, stops are installed on the outer and inner surfaces of the outer pipe, which have the possibility of contacting one end with a supporting connecting sleeve attached to the casing the shank of the well, and the other end - with sealing elements having the possibility of compression, one of which is placed on the outer surface outwardly pipes, and the other between the outer and intermediate pipes, with each gap mentioned above, coaxially with each other, precompressed sealing elements and sealing elements are placed, which can be compressed. 2. The compensator under item 1, characterized in that the sealing elements are made of basalt fiber having a fiber diameter of from 0.5 to 3.5 microns. 3. The compensator according to claim 1, characterized in that corrugations are made on the surfaces of the pipes in contact with the sealing elements. 4. The compensator according to claim 1, characterized in that its metal parts are made of INCONEL 740H alloy.

Images