Hydraulic bidirectional stratum isolation valve system

Abstract

The invention relates to the technical field of well completion equipment, and discloses a hydraulic two-way stratum isolation valve system which comprises a piston cylinder, a sealing cylinder and a pressure-bearing sleeve which are connected in sequence, and a profile sleeve, a floating sleeve, a supporting cylinder and a two-way pressure-bearing ball valve module which are connected in sequence are arranged in an internal space formed after the piston cylinder, the sealing cylinder and the pressure-bearing sleeve are fixedly connected. A mechanical switch module is arranged in an internal space formed after the molded surface sleeve and the floating sleeve are fixedly connected, the mechanical switch module is in power connection with the molded surface sleeve, and the supporting cylinder is in transmission connection with the bidirectional pressure-bearing ball valve module, so that the mechanical switch module drives the molded surface sleeve, the floating sleeve and the supporting cylinder to reciprocate so as to drive the bidirectional pressure-bearing ball valve module to be opened or closed. According to the hydraulic two-way stratum isolating valve system, a continuous oil pipe is prevented from being used by using an unlimited switching tool, two-way pressure bearing is achieved through a ball valve type isolating valve, the initial force value of a ball valve switch is limited through a limiting claw, and the ball valve is prevented from being accidentally opened during underground operation.

Description

Technical Field

[0001] The invention relates to the technical field of well completion equipment, and in particular to a hydraulic bidirectional formation isolation valve system. Background Art

[0002] At present, there are many complex fault-block oil reservoirs in the Beibu Gulf Basin, and abnormally high-pressure systems are common, facing severe well control safety risks. In China, conventional formation isolation valves adopt a plate valve design, which can only withstand pressure in one direction. When the valve needs to be opened, a special wire tool or continuous tubing must be used for breaking operations. This not only causes the problem of impurity precipitation making the valve difficult to open, but also increases the high cost of using continuous tubing. Therefore, it is necessary to design and develop a new type of two-way formation isolation valve to meet the actual needs of current field operations. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a hydraulic two-way formation isolation valve system that avoids the use of continuous oil pipes by using an unlimited number of switching tools, adopts a ball valve type isolation valve to achieve two-way pressure bearing, uses a limit claw to limit the initial force value of the ball valve switch, and avoids accidental opening of the ball valve during underground operations.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A hydraulic bidirectional formation isolation valve system comprises a piston cylinder, a sealing cylinder and a pressure-bearing sleeve connected in sequence, wherein the internal space after the piston cylinder, the sealing cylinder and the pressure-bearing sleeve are fixedly connected is provided with a profile sleeve, a floating sleeve, a support cylinder and a bidirectional pressure-bearing ball valve module connected in sequence, wherein the internal space after the profile sleeve and the floating sleeve are fixedly connected is provided with a mechanical switch module, wherein the mechanical switch module is dynamically connected to the profile sleeve, and the support cylinder is transmission-connected to the bidirectional pressure-bearing ball valve module, thereby the mechanical switch module drives the profile sleeve, the floating sleeve and the support cylinder to move back and forth, so as to drive the bidirectional pressure-bearing ball valve module to open or close.

[0005] As a further improvement of the above technical solution: The mechanical switch module includes a sliding short section, a guide shoe and a control sleeve. The lower end of the sliding short section is sleeved on the upper end of the guide shoe, and the control sleeve is sleeved on the outside of the sliding short section. The upper end of the control sleeve abuts against the sliding short section, and the lower end abuts against the guide shoe.

[0006] The inner wall of the profile sleeve is provided with a first step portion, the control sleeve is provided with a second step portion and a first slit, and the second step portion abuts against the first step portion to achieve power connection between the mechanical switch module and the profile sleeve.

[0007] The bidirectional pressure-bearing ball valve module includes a driving claw, a guide sleeve, an upper ball valve support, a ball valve, a sealing seat and a lower ball valve support. The upper end of the driving claw is sleeved on the lower end of the support tube, and the guide sleeve, the upper ball valve support and the ball valve are sequentially arranged in the middle of the driving claw. The upper ball valve support abuts against the lower end of the sealing tube, and the lower end of the driving claw is plugged into the lower ball valve support. The sealing seat is penetrated in the lower ball valve support and abuts against the ball valve seal.

[0008] A rotating shaft is provided on both sides of the ball valve, and a first through groove is provided on both sides of the driving claw, and the rotating shaft passes through the first through groove; A positioning plate is fixedly arranged on the inner wall of the pressure-bearing sleeve, and the rotating shaft is inserted into the positioning plate, so that the ball valve can only rotate around the rotating shaft in the pressure-bearing sleeve; A first groove is provided on both sides of the ball valve, and a rotating pin sleeve is movably arranged in the first groove. A cylindrical shaft is provided on both sides of the driving claw, and the cylindrical shaft is passed through the rotating pin sleeve. The support tube drives the driving claw to move back and forth, thereby opening or closing the ball valve, so as to realize the transmission connection between the support tube and the bidirectional pressure-bearing ball valve module.

[0009] The outer sleeve of the support tube is provided with a limiting claw, and the upper end of the limiting claw abuts against the floating sleeve, and the lower end abuts against the support tube. The interior of the sealing tube is provided with a movable limiting sleeve, and the movable limiting sleeve is arranged on the outside of the limiting claw. The inner wall of the movable limiting sleeve is provided with a third step portion, and the limiting claw is provided with a fourth step portion and a second slit, and the third step portion abuts against the fourth step portion, thereby limiting the automatic movement of the floating sleeve and the support tube to prevent the two-way pressure-bearing ball valve module from automatically opening or closing.

[0010] A floating piston is arranged between the piston cylinder and the floating sleeve, and a sealing ring is arranged between the sealing cylinder and the supporting cylinder, so that a closed liquid cavity is formed between the piston cylinder, the sealing cylinder, the floating sleeve and the supporting cylinder, and the limiting claw and the movable limiting sleeve are located in the closed liquid cavity.

[0011] The outer sleeve of the lower end of the sealing seat is provided with a spring end ring, a positioning spring and a spring limiting ring. One end of the positioning spring abuts against the spring end ring, and the other end abuts against the spring limiting ring.

[0012] The lower end of the pressure-bearing sleeve is provided with a variable buckle short section, and the lower end of the sealing seat abuts against the variable buckle short section.

[0013] Compared with the prior art, the advantages of the present invention are: The hydraulic bidirectional formation isolation valve system of the present invention is provided with a second step portion on the control sleeve, and a first step portion is provided on the inner wall of the profile sleeve. The second step portion is kept in contact with the first step portion within a certain force value. When the force value is exceeded, the second step portion will deform inwardly and recover through the first step portion, thereby forming an unlimited number of opening or closing bidirectional pressure-bearing ball valve modules, which greatly reduces the number of times the continuous oil pipe is used and avoids the high cost of using the continuous oil pipe; the bidirectional pressure-bearing ball valve module adopts a ball valve structure, and the reciprocating movement of the driving claw can provide a rotational torque for the ball valve to open or close the ball valve, thereby realizing bidirectional pressure bearing at the upper and lower ends; a fourth step portion is provided on the limit claw, and a third step portion is provided on the inner wall of the movable limit sleeve. The fourth step portion is kept in contact with the third step portion within a certain force value, thereby providing an initial force value for limiting the opening and closing of the ball valve, effectively preventing the ball valve from being accidentally opened and closed, and a sealed cavity is formed at the positions where the limit claw and the movable limit sleeve are located, thereby preventing mud from entering and depositing during use and causing the limit claw to fail. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the cross-sectional structure of the hydraulic bidirectional formation isolation valve system.

[0015] Figure 2 This is a schematic diagram of the disassembled internal structure of the piston cylinder, sealing cylinder and pressure sleeve.

[0016] Figure 3 It is a schematic diagram of the disassembly of the internal structure of the profile sleeve and the floating sleeve.

[0017] Figure 4 This is a schematic diagram of the disassembly of the mechanical switch module.

[0018] Figure 5 It is a schematic diagram of the cross-sectional structure of the mechanical switch module and the profile sleeve.

[0019] Figure 6 for Figure 5 Enlarged view of detail A.

[0020] Figure 7 It is a schematic diagram of the disassembly of the limit claw and the movable limit sleeve.

[0021] Figure 8 It is a schematic diagram of the cross-sectional structure of the limiting claw and the movable limiting sleeve.

[0022] Fig. 9 for Figure 8 Enlarged view of detail B.

[0023] Fig.10 It is a structural schematic diagram of a bidirectional pressure-bearing ball valve module.

[0024] Fig.11 This is a schematic diagram of the disassembly of the bidirectional pressure-bearing ball valve module.

[0025] Fig.12 It is a structural diagram of a ball valve.

[0026] Fig.13 It is a schematic diagram of the cross-sectional structure of the pressure sleeve, sealing seat and variable buckle short joint.

[0027] Legend: 1. Piston cylinder; 2. Sealing cylinder; 3. Pressure sleeve; 4. Profile sleeve; 5. Floating sleeve; 6. Support cylinder; 7. Bidirectional pressure-bearing ball valve module; 701. Driving claw; 702. Guide sleeve; 703. Upper ball valve support; 704. Ball valve; 705. Sealing seat; 706. Lower ball valve support; 8. Mechanical switch module; 801. Over-sliding short section; 802. Guide shoe; 803. Control sleeve; 9. First step; 1 0. Second step portion; 11. First slit; 12. Rotating shaft; 13. First through groove; 14. Positioning plate; 15. First groove; 16. Rotating pin sleeve; 17. Cylindrical shaft; 18. Limit claw; 19. Movable limit sleeve; 20. Third step portion; 21. Fourth step portion; 22. Second slit; 23. Floating piston; 24. Spring end ring; 25. Positioning spring; 26. Spring limit ring; 27. Variable buckle short section. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figures 1 to 3 As shown, the hydraulic bidirectional formation isolation valve system of this embodiment includes a piston cylinder 1, a sealing cylinder 2 and a pressure-bearing sleeve 3 connected in sequence, and the internal space after the piston cylinder 1, the sealing cylinder 2 and the pressure-bearing sleeve 3 are fixedly connected is provided with a profile sleeve 4, a floating sleeve 5, a support cylinder 6 and a bidirectional pressure-bearing ball valve module 7 connected in sequence, and the internal space after the profile sleeve 4 and the floating sleeve 5 are fixedly connected is provided with a mechanical switch module 8, the mechanical switch module 8 is dynamically connected to the profile sleeve 4, and the support cylinder 6 is transmission connected to the bidirectional pressure-bearing ball valve module 7, so that the mechanical switch module 8 drives the profile sleeve 4, the floating sleeve 5 and the support cylinder 6 to move reciprocatingly to drive the bidirectional pressure-bearing ball valve module 7 to open or close.

[0030] like Figures 4 to 6 As shown, specifically, the mechanical switch module 8 includes a sliding short section 801, a guide shoe 802 and a control sleeve 803, the lower end of the sliding short section 801 is sleeved on the upper end of the guide shoe 802, the control sleeve 803 is sleeved on the outside of the sliding short section 801, and the upper end of the control sleeve 803 abuts against the sliding short section 801, and the lower end abuts against the guide shoe 802.

[0031] Specifically, the inner wall of the profile sleeve 4 is provided with a first step portion 9 , the control sleeve 803 is provided with a second step portion 10 and a first slit 11 , and the second step portion 10 abuts against the first step portion 9 to achieve power connection between the mechanical switch module 8 and the profile sleeve 4 .

[0032] In this embodiment, the mechanical switch module 8 is equipped with a special hydraulic switch tool, and the mechanical switch module 8 can be placed from the wellhead into the profile sleeve 4 to realize mechanical switching. The control sleeve 803 of the mechanical switch module 8 is provided with a second step portion 10 and a first slit 11, and the inner wall of the profile sleeve 4 is correspondingly provided with a first step portion 9. When the control sleeve 803 moves from top to bottom in the profile sleeve 4, the second step portion 10 abuts against the first step portion 9, and under a certain force value, the profile sleeve 4 can be driven to move, thereby driving the two-way pressure-bearing ball valve module 7 to open. When a certain force value is exceeded, the second step portion 10 will deform and recover inward, and then the second step portion 10 will pass through the first step portion 9 and be located on the other side of the first step portion 9. A reverse force of a certain force value can continue to drive the profile sleeve 4 to move, thereby driving the two-way pressure-bearing ball valve module 7 to close. When a certain force value is exceeded, the second step portion 10 will deform and recover inward, and then pass through the first step portion 9 again to take out the mechanical switch module 8, thereby forming an unlimited number of opening or closing of the two-way pressure-bearing ball valve module 7, greatly reducing the number of times the continuous oil pipe is used.

[0033] like Figures 10 to 12 As shown, specifically, the bidirectional pressure-bearing ball valve module 7 includes a driving claw 701, a guide sleeve 702, an upper ball valve support 703, a ball valve 704, a sealing seat 705 and a lower ball valve support 706. The upper end of the driving claw 701 is sleeved on the lower end of the support tube 6, the guide sleeve 702, the upper ball valve support 703 and the ball valve 704 are sequentially arranged in the middle of the driving claw 701, the upper ball valve support 703 abuts against the lower end of the sealing tube 2, the lower end of the driving claw 701 is plugged into the lower ball valve support 706, and the sealing seat 705 is penetrated into the lower ball valve support 706 and sealingly abuts against the ball valve 704.

[0034] Specifically, a rotating shaft 12 is provided on both sides of the ball valve 704, and a first through groove 13 is provided on both sides of the driving claw 701, and the rotating shaft 12 passes through the first through groove 13; a positioning plate 14 is fixedly provided on the inner wall of the pressure-bearing sleeve 3, and the rotating shaft 12 is inserted into the positioning plate 14, so that the ball valve 704 can only rotate around the rotating shaft 12 in the pressure-bearing sleeve 3; a first groove 15 is provided on both sides of the ball valve 704, and a rotating pin sleeve 16 is movably provided in the first groove 15, and a cylindrical shaft 17 is provided on both sides of the driving claw 701, and the cylindrical shaft 17 is inserted into the rotating pin sleeve 16, and the support cylinder 6 drives the driving claw 701 to move reciprocatingly, so that the ball valve 704 is opened or closed, so as to realize the transmission connection between the support cylinder 6 and the two-way pressure-bearing ball valve module 7.

[0035] In this embodiment, the driving claw 701 sandwiches the guide sleeve 702, the upper ball valve support 703 and the ball valve 704, the lower end of the driving claw 701 is inserted into the groove of the lower ball valve support 706, the rotating shafts 12 on both sides of the ball valve 704 are installed in the first through grooves 13 of the driving claw 701, and the rotating pin sleeves 16 are movably arranged in the first grooves 15 on both sides of the ball valve 704, and the cylindrical shaft 17 on the driving claw 701 is penetrated in the rotating pin sleeves 16. The reciprocating movement of the driving claw 701 can provide a rotational torque for the ball valve 704. When in use, the upper ball valve support 703 and the lower ball valve support 706 contact the ball valve 704 and play a straightening role, the sealing cylinder 2 limits the upward movement of the ball valve 704, and the sealing seat 705 limits the downward movement of the ball valve 704 and forms a seal with the ball valve 704, so as to realize pressure bearing at the upper and lower ends.

[0036] like Figures 7 to 9 As shown, specifically, the outer sleeve of the support cylinder 6 is provided with a limit claw 18, and the upper end of the limit claw 18 abuts against the floating sleeve 5, and the lower end abuts against the support cylinder 6. A movable limit sleeve 19 is provided inside the sealing cylinder 2. The movable limit sleeve 19 is sleeved on the outside of the limit claw 18, and the inner wall of the movable limit sleeve 19 is provided with a third step portion 20. The limit claw 18 is provided with a fourth step portion 21 and a second slit 22, and the third step portion 20 abuts against the fourth step portion 21, thereby limiting the automatic movement of the floating sleeve 5 and the support cylinder 6 to prevent the two-way pressure-bearing ball valve module 7 from automatically opening or closing.

[0037] In this embodiment, the use of the limit claw 18 can limit the initial force value of the ball valve 704 to open and close, thereby preventing the ball valve 704 from accidentally opening and closing during underground operations. The limit position of the limit claw 18 can be adjusted by adjusting the movable limit sleeve 19. The limit claw 18 is provided with a fourth step portion 21 and a second slit 22. The inner wall of the movable limit sleeve 19 is correspondingly provided with a third step portion 20. The fourth step portion 21 abuts against the third step portion 20, which can limit the support tube 6 from moving within a certain force value. When the mechanical switch module 8 drives the two-way pressure-bearing ball valve module 7 to open or close, the applied force value is large, and the fourth step portion 21 will deform and recover inward, so that the fourth step portion 21 passes through the third step portion 20, so that the support tube 6 can move back and forth, and the fourth step portion 21 is located on the other side of the third step portion 20; when there is no mechanical switch module 8 driving, the fourth step portion 21 on the limit claw 18 will remain in contact with the third step portion 20 within a certain force value, thereby preventing the two-way pressure-bearing ball valve module 7 from being accidentally opened or closed.

[0038] Specifically, a floating piston 23 is arranged between the piston cylinder 1 and the floating sleeve 5, and a sealing ring is arranged between the sealing cylinder 2 and the supporting cylinder 6, so that a closed liquid cavity is formed between the piston cylinder 1, the sealing cylinder 2, the floating sleeve 5 and the supporting cylinder 6, and the limiting claw 18 and the movable limiting sleeve 19 are located in the closed liquid cavity.

[0039] In this embodiment, a floating piston 23 is arranged between the piston cylinder 1 and the floating sleeve 5, a sealing ring is arranged between the sealing cylinder 2 and the support cylinder 6, a sealing ring is arranged between the piston cylinder 1 and the sealing cylinder 2, and a sealing ring is arranged between the floating sleeve 5 and the support cylinder 6, so that a closed liquid cavity is formed between the piston cylinder 1, the sealing cylinder 2, the floating sleeve 5 and the support cylinder 6, thereby protecting the limit claw 18 and the movable limit sleeve 19 in the liquid injected in advance, thereby preventing mud from entering and depositing, causing the limit claw 18 to fail.

[0040] Specifically, the outer sleeve of the lower end of the sealing seat 705 is provided with a spring end ring 24, a positioning spring 25 and a spring limiting ring 26, one end of the positioning spring 25 abuts against the spring end ring 24, and the other end abuts against the spring limiting ring 26.

[0041] like Figure 1 , Figure 2 and Fig.13 As shown, specifically, the lower end of the pressure-bearing sleeve 3 is provided with a variable buckle short section 27 , and the lower end of the sealing seat 705 abuts against the variable buckle short section 27 .

[0042] The hydraulic bidirectional formation isolation valve system of the present invention is provided with a second step portion 10 on the control sleeve 803, and a first step portion 9 is provided on the inner wall of the profile sleeve 4. The second step portion 10 is kept in contact with the first step portion 9 within a certain force value. When the force value is exceeded, the second step portion 10 will deform inward and recover and pass through the first step portion 9, thereby forming an unlimited number of opening or closing of the bidirectional pressure-bearing ball valve module 7, which greatly reduces the number of times the continuous oil pipe is used and avoids the high cost of using the continuous oil pipe; the bidirectional pressure-bearing ball valve module 7 adopts a ball valve structure, and the reciprocating motion of the driving claw 701 is realized. The movement can provide a rotational torque for the ball valve 704, so that the ball valve 704 is opened or closed, and bidirectional pressure is achieved at the upper and lower ends; a fourth step portion 21 is provided on the limit claw 18, and a third step portion 20 is provided on the inner wall of the movable limit sleeve 19. The fourth step portion 21 and the third step portion 20 remain in contact within a certain force value, providing an initial force value for limiting the opening and closing of the ball valve 704, effectively preventing the ball valve 704 from opening and closing accidentally, and a sealed cavity is formed at the positions of the limit claw 18 and the movable limit sleeve 19, which can prevent mud from entering and depositing during use, causing the limit claw 18 to fail.

[0043] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and changes obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A hydraulic two-way formation isolation valve system, characterized in that: The invention comprises a piston cylinder (1), a sealing cylinder (2) and a pressure-bearing sleeve (3) connected in sequence, wherein the inner space after the piston cylinder (1), the sealing cylinder (2) and the pressure-bearing sleeve (3) are fixedly connected is provided with a profile sleeve (4), a floating sleeve (5), a support cylinder (6) and a bidirectional pressure-bearing ball valve module (7) connected in sequence, wherein the inner space after the profile sleeve (4) and the floating sleeve (5) are fixedly connected is provided with a mechanical switch module (8), wherein the mechanical switch module (8) is dynamically connected to the profile sleeve (4), and the support cylinder (6) is transmission-connected to the bidirectional pressure-bearing ball valve module (7), so that the mechanical switch module (8) drives the profile sleeve (4), the floating sleeve (5) and the support cylinder (6) to move back and forth, thereby driving the bidirectional pressure-bearing ball valve module (7) to open or close.

2. The hydraulic bidirectional formation isolation valve system according to claim 1, characterized in that: The mechanical switch module (8) comprises a sliding short section (801), a guide shoe (802) and a control sleeve (803); the lower end of the sliding short section (801) is sleeved on the upper end of the guide shoe (802); the control sleeve (803) is sleeved on the outside of the sliding short section (801); the upper end of the control sleeve (803) abuts against the sliding short section (801) and the lower end abuts against the guide shoe (802).

3. The hydraulic bidirectional formation isolation valve system according to claim 2, characterized in that: The inner wall of the profile sleeve (4) is provided with a first step portion (9), the control sleeve (803) is provided with a second step portion (10) and a first slit (11), the second step portion (10) abutting against the first step portion (9) to achieve power connection between the mechanical switch module (8) and the profile sleeve (4).

4. The hydraulic bidirectional formation isolation valve system according to claim 3, characterized in that: The bidirectional pressure-bearing ball valve module (7) comprises a driving claw (701), a guide sleeve (702), an upper ball valve support (703), a ball valve (704), a sealing seat (705) and a lower ball valve support (706); the upper end of the driving claw (701) is sleeved on the lower end of the support tube (6); the guide sleeve (702), the upper ball valve support (703) and the ball valve (704) are sequentially arranged in the middle of the driving claw (701); the upper ball valve support (703) is abutted against the lower end of the sealing tube (2); the lower end of the driving claw (701) is plugged into the lower ball valve support (706); and the sealing seat (705) is penetrated into the lower ball valve support (706) and is in sealing abutment with the ball valve (704).

5. The hydraulic bidirectional formation isolation valve system according to claim 4, characterized in that: A rotating shaft (12) is provided on both sides of the ball valve (704), and a first through groove (13) is provided on both sides of the driving claw (701), and the rotating shaft (12) passes through the first through groove (13); A positioning plate (14) is fixedly provided on the inner wall of the pressure-bearing sleeve (3), and the rotating shaft (12) is inserted into the positioning plate (14), so that the ball valve (704) can only rotate around the rotating shaft (12) in the pressure-bearing sleeve (3); First grooves (15) are provided on both sides of the ball valve (704), and a rotating pin sleeve (16) is movably provided in the first groove (15). Cylindrical shafts (17) are provided on both sides of the driving claw (701), and the cylindrical shafts (17) are inserted into the rotating pin sleeves (16). The support cylinder (6) drives the driving claw (701) to move back and forth, thereby opening or closing the ball valve (704), so as to realize the transmission connection between the support cylinder (6) and the bidirectional pressure-bearing ball valve module (7).

6. The hydraulic bidirectional formation isolation valve system according to claim 5, characterized in that: The support tube (6) is provided with a limiting claw (18) on its outer sleeve, and the upper end of the limiting claw (18) abuts against the floating sleeve (5), and the lower end abuts against the support tube (6). The sealing tube (2) is provided with a movable limiting sleeve (19) inside, and the movable limiting sleeve (19) is sleeved on the outside of the limiting claw (18). The inner wall of the movable limiting sleeve (19) is provided with a third step portion (20). The limiting claw (18) is provided with a fourth step portion (21) and a second slit (22). The third step portion (20) abuts against the fourth step portion (21), thereby limiting the automatic movement of the floating sleeve (5) and the support tube (6), so as to prevent the two-way pressure-bearing ball valve module (7) from being automatically opened or closed.

7. The hydraulic bidirectional formation isolation valve system according to claim 6, characterized in that: A floating piston (23) is provided between the piston cylinder (1) and the floating sleeve (5), and a sealing ring is provided between the sealing cylinder (2) and the supporting cylinder (6), so that a closed liquid cavity is formed between the piston cylinder (1), the sealing cylinder (2), the floating sleeve (5) and the supporting cylinder (6), and the limiting claw (18) and the movable limiting sleeve (19) are located in the closed liquid cavity.

8. The hydraulic bidirectional formation isolation valve system according to claim 7, characterized in that: The outer sleeve at the lower end of the sealing seat (705) is provided with a spring end ring (24), a positioning spring (25) and a spring limiting ring (26); one end of the positioning spring (25) abuts against the spring end ring (24), and the other end abuts against the spring limiting ring (26).

9. The hydraulic bidirectional formation isolation valve system according to claim 8, characterized in that: The lower end of the pressure-bearing sleeve (3) is provided with a variable buckle short section (27), and the lower end of the sealing seat (705) abuts against the variable buckle short section (27).

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