A Y342 constant force hydraulic packer

Abstract

The present invention relates to the field of oil production technology, and specifically to a Y342 constant force hydraulic packer, comprising an upper joint, an inner tube and a lower joint, wherein at least one first liquid inlet hole is provided at a place of the inner tube near the upper joint, and at least one second liquid inlet hole is provided at one end of the inner tube near the lower joint, a balancing cylinder sleeve is provided on the inner tube, and at least one third liquid inlet hole is provided on the other end, a limiting component for sealing the third liquid inlet hole is installed inside the balancing cylinder sleeve, an inner center tube and a driving component are provided on the inner tube, at least one center tube locking block is pierced on the outer wall of the other end of the inner center tube, a sealing component is provided on the inner center tube, and at least one first liquid outlet hole is provided between the sealing component and the inner center tube, and the oil pipe is pressurized, and the pressure controls the operation of the driving component through the second liquid inlet hole, so as to push the sealing component to complete the sealing action, and at the same time, the first liquid outlet hole is exposed to open the backwash well route.

Description

Technical Field

[0001] The invention relates to the technical field of oil production, and in particular to a Y342 constant force hydraulic packer. Background Art

[0002] At present, the packers used in domestic oilfield water injection are mostly Y341 type packers. After the Y341 type packer is pressed and sealed, a mechanical locking method is used to prevent the rebound of the compression rubber cylinder. The mechanical locking mechanism generally has a rebound distance of about 1.5mm, which causes the rubber cylinder stress to relax, thereby reducing the pressure bearing capacity of the packer; at the same time, the creep of the pipe string during water injection causes the packer to be unsealed in advance. Tubing anchors, hydraulic anchors and other anchors are often configured at the upper end of the water injection pipe string. When the water injection pipe string is configured with tubing anchors and other anchors, the sealing points of the water injection pipe string are increased, which increases the risk of poor sealing of the water injection pipe string, and also increases the number of downhole tools of the water injection pipe string, which increases the cost. Moreover, after adding tubing anchors and other anchors, after long-term water injection in the well, the tools are scaled and difficult to unblock, which is easy to cause the pipe string to encounter resistance in the later stage, resulting in overhaul, which greatly increases the cost of oilfield operations.

[0003] A Chinese patent (publication number: CN206458395U) has disclosed a "high-pressure water injection packer". After the pressure seat is sealed, a mechanical locking method is used to prevent the rebound of the compressed rubber cylinder. The mechanical locking mechanism generally has a rebound distance of about 1.5 mm. In the actual production process, this 1.5 mm rebound distance will cause the stress of the rubber cylinder to relax, thereby reducing the pressure-bearing capacity of the packer; resulting in incomplete sealing, and the unsealing method is to lift up to unseal. There is a certain risk of pipe creeping during water injection, causing the packer to be unsealed prematurely and lose its function; it needs to be used with supporting tools such as hydraulic anchors and tubing anchors. When used with related anchoring tools, it will increase the risk points of the pipe string and increase the cost of use. Summary of the invention

[0004] In view of this, the purpose of the present invention is to propose a Y342 constant force hydraulic packer to solve the problems of unstable seating of common downhole packers, incomplete sealing of the casing annulus, and inability to seat the packer again after pressurizing the seating.

[0005] Based on the above purpose, the present invention provides a Y342 constant force hydraulic packer, including an upper joint, an inner tube and a lower joint, the two ends of the inner tube are respectively fixedly connected to the upper joint and one end of the lower joint, the inner tube is provided with at least one first liquid inlet hole near the upper joint, and the inner tube is provided with at least one second liquid inlet hole at one end near the lower joint, a balancing cylinder sleeve is sleeved on the inner tube, one end of the balancing cylinder sleeve is fitted with one end of the upper joint, and at least one third liquid inlet hole is provided on the other end, the interior of the balancing cylinder sleeve is connected to the first liquid inlet hole, and a limiting component for sealing the third liquid inlet hole is installed inside the balancing cylinder sleeve, and the inner tube is sleeved with an inner center tube and a driving The sealing assembly comprises a sealing member, wherein the sealing member is threadedly connected to the inner tube, one end of the inner tube is inserted into the limiting assembly, and at least one center tube locking block is penetrated on the outer wall of the other end, a sealing member is sleeved on the inner tube, one end of the sealing member is abutted against the limiting assembly, at least one first liquid outlet is provided between the sealing member and the inner tube, and the liquid outlet is provided on the outer wall of the inner tube, one end of the driving member is sleeved on the inner tube and abutted against one end of the sealing member away from the limiting assembly, and the other end is sleeved on the lower joint, the center tube locking block is squeezed and clamped on the outer wall of the inner tube by the driving member, and the driving member is communicated with the second liquid inlet;

[0006] The oil pipe is pressurized, and the pressure controls the operation of the driving component through the second liquid inlet hole, pushing the isolation component to complete the isolation action. At the same time, the first liquid outlet hole is exposed to open the backwash well route.

[0007] Preferably, a first rubber ring is provided between the upper joint and the inner tube, and the first rubber ring is clamped on the inner wall of the upper joint; a second rubber ring is provided between the balancing cylinder sleeve and the inner tube, and the second rubber ring is clamped on the inner wall of the balancing cylinder sleeve.

[0008] Preferably, the limiting component comprises:

[0009] A balancing piston is sleeved on the inner tube and located inside the balancing cylinder sleeve, and one end of the balancing piston is arranged close to the first liquid inlet hole;

[0010] A well-washing piston is sleeved on the balancing piston, and both ends of the balancing piston are clamped on the well-washing piston;

[0011] A well-washing pressure cap is sleeved on the inner tube, one end of the well-washing pressure cap abuts against one end of the balancing piston, and the well-washing pressure cap is arranged inside the well-washing piston and fixedly connected;

[0012] A well-washing packing is sleeved on the well-washing pressure cap, and one end of the well-washing packing is inserted on the well-washing piston;

[0013] A well washing seat, one end of which is arranged inside the balancing cylinder sleeve and fixedly connected, and the other end is sleeved on the inner center pipe, and the end of the well washing seat located inside the balancing cylinder sleeve is arranged close to the third liquid inlet hole and is arranged in an inclined surface to fit the well washing pressure cap and the well washing packing.

[0014] Preferably, a third rubber ring is clamped on the outer wall of the balancing piston, a fourth rubber ring is clamped on the inner wall of the balancing piston, a fifth rubber ring is clamped on the outer wall of the well-washing piston, and a sixth rubber ring is clamped on the inner wall of the well-washing seat.

[0015] Preferably, the sealing assembly includes a spacer ring, which is sleeved on the inner center tube, and both sides of the spacer ring are fitted with rubber tubes, one side of the rubber tube away from the spacer ring is fitted with the well washing seat, and the other side of the rubber tube away from the spacer ring is fitted with a first baffle ring, the first baffle ring is sleeved on the first liquid outlet hole on the inner center tube, and the first baffle ring is against the driving assembly.

[0016] Preferably, the driving assembly comprises:

[0017] A lock ring seat, sleeved on the inner center tube, one end of the lock ring seat abuts against the first baffle ring, and a second liquid outlet is provided on the lock ring seat;

[0018] A seat seal nipple is sleeved on the inner center pipe, one end of the seat seal nipple is inserted into the lock ring seat and fixedly connected, and the other end is sleeved on the center pipe lock block and pressed;

[0019] A seat sealing ring is clamped between the lock ring seat and the seat sealing nipple, the seat sealing ring is sleeved on the inner center tube, the interior of the seat sealing ring is provided with a right-handed single-start thread, and a right-handed single-start thread is provided at a location on the inner center tube between the first liquid outlet and the seat sealing ring;

[0020] An upper cylinder sleeve, one end of which is sleeved on the seat seal nipple and fixedly connected, and the other end of which is sleeved with an upper piston, the upper piston being sleeved on the inner tube, and the end of the upper piston away from the upper cylinder sleeve being arranged close to the second liquid inlet hole;

[0021] A second retaining ring is disposed between the upper cylinder sleeve and the inner tube, and one end of the second retaining ring is fixedly connected to one end of the inner center tube.

[0022] A lower cylinder sleeve, one end of which is sleeved on and fixedly connected to an end of the upper piston away from the upper cylinder sleeve, and the other end of which is sleeved on the lower joint;

[0023] A lower piston is arranged between the lower cylinder sleeve and the inner tube, one end of the lower piston is arranged between the upper piston and the lower cylinder sleeve, and one end of the lower piston is fixed on the upper piston through a seat seal shear pin;

[0024] A piston lock block is arranged between the lower piston and the inner tube, and the piston lock block is passed through the upper piston and is located at the second liquid inlet hole on the inner tube;

[0025] Among them, after the pressure relief is completed during setting, a normal pressure chamber is formed between the second baffle ring, the upper piston, the inner tube and the upper cylinder sleeve.

[0026] Preferably, at least one seventh rubber ring is clamped on the inner wall of the second baffle ring, at least one eighth rubber ring is clamped on the outer wall of the second baffle ring, a ninth rubber ring is provided between the upper piston and the upper cylinder sleeve, the ninth rubber ring is clamped on the outer wall of the upper piston, at least one tenth rubber ring is clamped on the inner wall of the upper piston, an eleventh rubber ring is provided between the upper piston and the lower cylinder sleeve, the eleventh rubber ring is clamped on the outer wall of the upper piston, at least one twelfth rubber ring is clamped on the outer wall of the lower piston, and at least one thirteenth rubber ring is clamped on the inner wall of the lower piston.

[0027] Preferably, a plurality of fourteenth rubber rings are clamped on the interior of the lower joint, a straightening retaining ring is sleeved on the lower joint and fixedly connected, and one end of the straightening retaining ring abuts against one end of the lower cylinder sleeve.

[0028] Beneficial effects of the present invention:

[0029] 1. The invention is designed with an auxiliary setting system of a normal pressure chamber, which can keep the packer in a setting state during operation and have a continuous setting force, thereby solving the problem of packer leakage and failure due to stress relaxation of the compression rubber cylinder, and improving the sealing performance and service life of the packer;

[0030] 2. The rotating unsealing method is adopted to effectively prevent the risk of unsealing caused by pipe creep. At the same time, no other anchoring tools are needed, which reduces the risk points of pipe sealing and improves operation efficiency.

[0031] 3. The auxiliary setting system of the atmospheric pressure chamber structure is integrated with the packer to reduce the processing and use costs of the tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the structure of the upper half of an embodiment of the present invention;

[0034] Figure 2It is a schematic diagram of the structure of the lower half of an embodiment of the present invention.

[0035] The markings in the figure are:

[0036] 1. Upper joint; 2. First rubber ring; 3. Inner tube; 4. Second rubber ring; 5. Balance cylinder sleeve; 6. Third rubber ring; 7. Well washing piston; 8. Fourth rubber ring; 9. Balance piston; 10. Fifth rubber ring; 11. Well washing packing; 12. Well washing pressure cap; 13. Sixth rubber ring; 14. Well washing seat; 15. Spacer ring; 16. Rubber cylinder; 17. First retaining ring; 18. Inner center tube; 19. Lock ring seat; 20. Seat sealing ring; 21. Seat seal Short section; 22. Upper cylinder sleeve; 23. Center tube lock block; 24. Second retaining ring; 25. Seventh rubber ring; 26. Eighth rubber ring; 27. Upper piston; 28. Ninth rubber ring; 29. ​​Tenth rubber ring; 30. Lower cylinder sleeve; 31. Eleventh rubber ring; 32. Seat seal shear pin; 33. Piston lock block; 34. Twelfth rubber ring; 35. Thirteenth rubber ring; 36. Lower piston; 37. Lower joint; 38. Fourteenth rubber ring; 39. Straightening retaining ring. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0038] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] like Figure 1 and Figure 2As shown, a Y342 constant force hydraulic packer comprises an upper joint 1, an inner tube 3 and a lower joint 37, the two ends of the inner tube 3 are fixedly connected to the upper joint 1 and one end of the lower joint 37 respectively, the inner tube 3 is provided with at least one first liquid inlet hole near the upper joint 1, and the inner tube 3 is provided with at least one second liquid inlet hole at one end near the lower joint 37, the inner tube 3 is sleeved with a balancing cylinder sleeve 5, one end of the balancing cylinder sleeve 5 is fitted with one end of the upper joint 1, and the other end is provided with at least one third liquid inlet hole, the interior of the balancing cylinder sleeve 5 is communicated with the first liquid inlet hole, the interior of the balancing cylinder sleeve 5 is equipped with a limiting assembly for sealing the third liquid inlet hole, the inner tube 3 is sleeved with an inner center pipe 18 and a driving assembly, The inner center tube 18 is threadedly connected with the inner tube 3, one end of the inner center tube 18 is inserted in the limiting assembly, and at least one center tube locking block 23 is pierced on the outer wall of the other end. A sealing assembly is sleeved on the inner center tube 18, one end of the sealing assembly abuts against the limiting assembly, and at least one first liquid outlet is provided between the sealing assembly and the inner center tube 18, and the liquid outlet is provided on the outer wall of the inner center tube 18. One end of the driving member is sleeved on the inner center tube 18 and abuts against one end of the sealing assembly away from the limiting assembly, and the other end is sleeved on the lower joint 37. The center tube locking block 23 is squeezed and clamped on the outer wall of the inner tube 3 by the driving assembly, and the driving assembly is communicated with the second liquid inlet;

[0040] The oil pipe is pressurized, and the pressure controls the operation of the driving component through the second liquid inlet hole, pushing the isolation component to complete the isolation action. At the same time, the first liquid outlet hole is exposed to open the backwash well route.

[0041] As an optional embodiment, a first rubber ring 2 is provided between the upper joint 1 and the inner tube 3, and the first rubber ring 2 is clamped on the inner wall of the upper joint 1. A second rubber ring 4 is provided between the balancing cylinder sleeve 5 and the inner tube 3, and the second rubber ring 4 is clamped on the inner wall of the balancing cylinder sleeve 5.

[0042] As an optional embodiment, the limiting component includes:

[0043] A balancing piston 9 is sleeved on the inner tube 3 and located inside the balancing cylinder sleeve 5, and one end of the balancing piston 9 is arranged close to the first liquid inlet hole;

[0044] The well-washing piston 7 is sleeved on the balancing piston 9, and both ends of the balancing piston 9 are clamped on the well-washing piston 7;

[0045] A well-washing pressure cap 12 is sleeved on the inner tube 3, one end of the well-washing pressure cap 12 abuts against one end of the balancing piston 9, and the well-washing pressure cap 12 is arranged inside the well-washing piston 7 and fixedly connected;

[0046] A well-washing packing 11 is sleeved on the well-washing pressure cap 12, and one end of the well-washing packing 11 is inserted on the well-washing piston 7;

[0047] The well washing seat 14 has one end arranged inside the balancing cylinder sleeve 5 and fixedly connected, and the other end is sleeved on the inner center tube 18, and the end of the well washing seat 14 located inside the balancing cylinder sleeve 5 is arranged close to the third liquid inlet hole and is arranged in an inclined surface to fit the well washing pressure cap 12 and the well washing packing 11.

[0048] As an optional embodiment, a third rubber ring 6 is clamped on the outer wall of the balancing piston 9, a fourth rubber ring 8 is clamped on the inner wall of the balancing piston 9, a fifth rubber ring 10 is clamped on the outer wall of the well flushing piston 7, and a sixth rubber ring 13 is clamped on the inner wall of the well flushing seat 14.

[0049] As an optional embodiment, the sealing assembly includes a spacer ring 15, and the spacer ring 15 is sleeved on the inner center tube 18. Both sides of the spacer ring 15 are fitted with rubber tubes 16. One side of the rubber tube 16 away from the spacer ring 15 is fitted with the well washing seat 14, and the other side of the rubber tube 16 away from the spacer ring 15 is fitted with a first baffle ring 17. The first baffle ring 17 is sleeved on the first liquid outlet hole on the inner center tube 18, and the first baffle ring 17 is against the driving assembly.

[0050] As an optional embodiment, the driving component includes:

[0051] A lock ring seat 19 is sleeved on the inner center tube 18, one end of the lock ring seat 19 abuts against the first baffle ring 17, and a second liquid outlet is provided on the lock ring seat 19;

[0052] The sealing nipple 21 is sleeved on the inner center tube 18, one end of the sealing nipple 21 is inserted into the lock ring seat 19 and fixedly connected, and the other end is sleeved on the center tube lock block 23 and pressed;

[0053] A seat sealing ring 20 is clamped between the lock ring seat 19 and the seat sealing nipple 21. The seat sealing ring 20 is sleeved on the inner center tube 18. The interior of the seat sealing ring 20 is provided with a right-handed single-start thread, and a right-handed single-start thread is provided at a location between the first liquid outlet and the seat sealing ring 20 on the inner center tube 18;

[0054] An upper cylinder sleeve 22, one end of which is sleeved on the seat seal nipple 21 and fixedly connected, and the other end of which is sleeved with an upper piston 27, the upper piston 27 is sleeved on the inner tube 3, and the end of the upper piston 27 away from the upper cylinder sleeve 22 is arranged close to the second liquid inlet hole;

[0055] The second retaining ring 24 is disposed between the upper cylinder sleeve 22 and the inner tube 3, and one end of the second retaining ring 24 is fixedly connected to one end of the inner center tube 18.

[0056] A lower cylinder sleeve 30, one end of which is sleeved on and fixedly connected to the end of the upper piston 27 away from the upper cylinder sleeve 22, and the other end of which is sleeved on the lower joint 37;

[0057] A lower piston 36 is disposed between the lower cylinder sleeve 30 and the inner tube 3, one end of the lower piston 36 is disposed between the upper piston 27 and the lower cylinder sleeve 30, and one end of the lower piston 36 is fixed on the upper piston 27 through a seat seal shear pin 32;

[0058] A piston lock block 33 is disposed between the lower piston 36 and the inner tube 3. The piston lock block 33 is passed through the upper piston 27 and is located at the second liquid inlet hole on the inner tube 3.

[0059] After the pressure relief is completed during setting, a normal pressure chamber is formed between the second baffle ring 24 , the upper piston 27 , the inner tube 3 and the upper cylinder sleeve 22 .

[0060] As an optional embodiment, at least one seventh rubber ring 25 is clamped on the inner wall of the second baffle ring 24, at least one eighth rubber ring 26 is clamped on the outer wall of the second baffle ring 24, a ninth rubber ring 28 is provided between the upper piston 27 and the upper cylinder sleeve 22, the ninth rubber ring 28 is clamped on the outer wall of the upper piston 27, at least one tenth rubber ring 29 is clamped on the inner wall of the upper piston 27, an eleventh rubber ring 31 is provided between the upper piston 27 and the lower cylinder sleeve 30, the eleventh rubber ring 31 is clamped on the outer wall of the upper piston 27, at least one twelfth rubber ring 34 is clamped on the outer wall of the lower piston 36, and at least one thirteenth rubber ring 35 is clamped on the inner wall of the lower piston 36.

[0061] As an optional embodiment, a plurality of fourteenth rubber rings 38 are clamped on the interior of the lower joint 37 , a centering retaining ring 39 is sleeved on the lower joint 37 and fixedly connected, and one end of the centering retaining ring 39 abuts against one end of the lower cylinder sleeve 30 .

[0062] The working principle of the present invention is:

[0063] Sealing action:

[0064] The oil pipe is pressurized, and the pressure enters the tool from the first liquid inlet hole of the inner tube 3. The surfaces of the balancing cylinder sleeve 5, the well washing piston 7 and the balancing piston 9 are sealed with the second rubber ring 4, the fifth rubber ring 10 and the third rubber ring 6. The inner center tube 18 is fixed to the inner tube 3 by the center tube locking block 23. Similarly, the well washing seat 14 is supported and fixed by the inner center tube 18. Similarly, the balancing cylinder sleeve 5 is fixed. After the pressure enters, it will push the balancing piston 9 downward, and the balancing piston 9 will drive the well washing piston 7, the well washing pressure cap 12 and the well washing packing 11 to move downward synchronously until the well washing packing 11 contacts the well washing seat 14, completes the sealing cooperation and limits the position, and at this time the backwashing well channel is closed; the surfaces of the lower piston 36, the upper piston 27 and the lower joint 37 have multiple twelfth rubber rings 34, the ninth rubber ring 28, the tenth rubber ring 29 and the fourteenth rubber ring 38, which cooperate with the seal and continue to pressurize. When the pressure continues to increase, the lower piston 36 moves downward, the seat seal shear pin 32 is cut off, the inner tube 3 is connected and fixed with the lower joint 37, the lower piston 36 moves downward, contacts with the lower joint 37 and completes the limit, at this time, the piston lock block 33 is released, and the pressure pushes the upper piston 27 to move upward, the upper piston 27 drives the lower cylinder sleeve 30, the upper cylinder sleeve 22 and the seat seal short section 21 to move upward, and the center pipe lock block 23 is released, The surface of the inner center tube 18 is provided with a right-handed single-start thread, and the interior of the seat sealing ring 20 is provided with a right-handed single-start thread. The seat sealing nipple 21 drives the locking ring seat 19 and the seat sealing ring 20 to move upward, and the seat sealing ring 20 moves upward to cooperate with the single-start thread of the inner center tube 18 to form a locking function, which can only move upward and cannot retract. The locking ring seat 19 continues to move upward to squeeze the first retaining ring 17, and squeezes the rubber cylinder 16 and the spacer ring 15 in turn to complete the sealing action and relieve the pressure in the oil pipe. Under the one-way locking effect of the seat sealing ring 20, the rubber cylinder 16 will not retract and is always in a compressed state. The rubber cylinder 16 completes the sealing action. When the seat sealing After the pressure relief is completed, since the inner and outer surfaces of the second baffle ring 24 are sealed with the seventh rubber ring 25 and the eighth rubber ring 26 respectively, and the inner and outer surfaces of the upper piston 27 are sealed with the ninth rubber ring 28 and the tenth rubber ring 29 respectively, at this time, a normal pressure chamber is formed between the second baffle ring 24, the upper piston 27, the inner tube 3 and the upper cylinder sleeve 22, and water cannot enter the interior. There is only air inside. When the liquid level in the oil pipe rises, under the action of the normal pressure chamber, the pressure of the liquid surface in the oil pipe will continue to act on the upper piston 27, so that it has a continuous upward extrusion pressure, so that the rubber cylinder 16 can continue to be subjected to the extrusion pressure and remain in a compressed state.

[0065] Backwash well route:

[0066] During backwashing, there is no pressure in the oil pipe, and the well washing fluid enters from the casing to the rubber cylinder 16. The rubber cylinder 16 is in a compressed and sealed state at this time, and the well washing fluid cannot continue to go down, and can only enter through the third liquid inlet hole on the balance cylinder sleeve 5. At this time, under the action of pressure, the well washing piston 7, the well washing packing 11 and the well washing pressure cap 12 are pushed upward to open the well washing channel. The well washing fluid passes through the gap between the well washing seat 14, the inner center tube 18 and the inner tube 3, bypasses the rubber cylinder 16, and returns to the casing through the first liquid outlet hole of the inner center tube 18 and the second liquid outlet hole on the lock ring seat 19, and finally enters the oil pipe to complete the well washing process.

[0067] Unblocking action:

[0068] Lift the tubing column and rotate the oil pipe forward. When the seat is sealed, the center pipe locking block 23 is released, and the inner pipe 3 rotates with the inner center pipe 18. The inner pipe 3 and the inner center pipe 18 are threadedly connected as a reverse buckle. The inner center pipe 18 is fixed together with the second retaining ring 24. When the oil pipe rotates forward and drives the inner pipe 3 to rotate forward, the inner pipe 3 drives the inner center pipe 18 downward, and the inner center pipe 18 drives the seat sealing ring 20 and the seat sealing short section 21 downward. The downward movement of the seat sealing short section 21 drives the locking ring seat 19 and the upper cylinder sleeve 22 to move downward synchronously, and the rubber cylinder 16 loses its support and is no longer compressed, thereby completing the unsealing action.

[0069] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A Y342 constant force hydraulic packer, comprising an upper joint (1), an inner tube (3) and a lower joint (37), wherein two ends of the inner tube (3) are fixedly connected to one end of the upper joint (1) and one end of the lower joint (37), respectively, and characterized in that: At least one first liquid inlet hole is provided at a location of the inner tube (3) close to the upper joint (1), and at least one second liquid inlet hole is provided at one end of the inner tube (3) close to the lower joint (37). A balancing cylinder sleeve (5) is sleeved on the inner tube (3), one end of the balancing cylinder sleeve (5) is arranged in close contact with one end of the upper joint (1), and at least one third liquid inlet hole is provided on the other end. The interior of the balancing cylinder sleeve (5) is communicated with the first liquid inlet hole, and a limiting assembly for sealing the third liquid inlet hole is installed inside the balancing cylinder sleeve (5). An inner center tube (18) and a drive assembly are sleeved on the inner tube (3), and the inner center tube (18) is threadedly connected to the inner tube (3). One end is inserted into the limiting component, and at least one center tube locking block (23) is penetrated on the outer wall of the other end; a sealing component is sleeved on the inner center tube (18), one end of the sealing component abuts against the limiting component, at least one first liquid outlet is provided between the sealing component and the inner center tube (18), and the liquid outlet is provided on the outer wall of the inner center tube (18); one end of the driving component is sleeved on the inner center tube (18) and abuts against one end of the sealing component away from the limiting component, and the other end is sleeved on the lower joint (37); the center tube locking block (23) is squeezed and clamped on the outer wall of the inner tube (3) by the driving component, and the driving component is communicated with the second liquid inlet; The oil pipe is pressurized, and the pressure controls the driving component to work through the second liquid inlet hole, pushing the isolation component to complete the isolation action. At the same time, the first liquid outlet hole is exposed to open the backwash well route; The limiting component comprises: A balancing piston (9) is sleeved on the inner tube (3) and is located inside the balancing cylinder sleeve (5), and one end of the balancing piston (9) is arranged close to the first liquid inlet hole; A well-washing piston (7) is sleeved on the balancing piston (9), and both ends of the balancing piston (9) are clamped on the well-washing piston (7); A well-washing pressure cap (12) is sleeved on the inner tube (3), one end of the well-washing pressure cap (12) abuts against one end of the balancing piston (9), and the well-washing pressure cap (12) is arranged inside the well-washing piston (7) and fixedly connected; A well-washing packing (11) is sleeved on the well-washing pressure cap (12), and one end of the well-washing packing (11) is inserted into the well-washing piston (7); A well-washing seat (14), one end of which is arranged inside the balancing cylinder sleeve (5) and fixedly connected, and the other end of which is sleeved on the inner center tube (18), and the end of the well-washing seat (14) located inside the balancing cylinder sleeve (5) is arranged close to the third liquid inlet hole and is arranged in an inclined surface to fit the well-washing pressure cap (12) and the well-washing packing (11); The sealing assembly comprises a spacer ring (15), the spacer ring (15) being sleeved on the inner center tube (18), and rubber tubes (16) being fitted on both sides of the spacer ring (15), one side of the rubber tube (16) away from the spacer ring (15) being fitted with the well washing seat (14), and the other side of the rubber tube (16) away from the spacer ring (15) being fitted with a first retaining ring (17), the first retaining ring (17) being sleeved on a first liquid outlet hole on the inner center tube (18), and the first retaining ring (17) being against the driving assembly; The drive assembly comprises: A lock ring seat (19) is sleeved on the inner center tube (18), one end of the lock ring seat (19) abuts against the first retaining ring (17), and a second liquid outlet hole is provided on the lock ring seat (19); A seat seal nipple (21) is sleeved on the inner center tube (18), one end of the seat seal nipple (21) is inserted into the lock ring seat (19) and fixedly connected, and the other end is sleeved on the center tube lock block (23) and pressed; A seat sealing ring (20) is clamped between the lock ring seat (19) and the seat sealing nipple (21), the seat sealing ring (20) is sleeved on the inner center tube (18), a right-handed single-start thread is provided inside the seat sealing ring (20), and a right-handed single-start thread is provided at a location on the inner center tube (18) between the first liquid outlet and the seat sealing ring (20); An upper cylinder sleeve (22), one end of which is sleeved on the seat seal nipple (21) and fixedly connected, and the other end of which is sleeved with an upper piston (27), the upper piston (27) being sleeved on the inner tube (3), and the end of the upper piston (27) away from the upper cylinder sleeve (22) being arranged close to the second liquid inlet hole; A second retaining ring (24) is arranged between the upper cylinder sleeve (22) and the inner tube (3), one end of the second retaining ring (24) being fixedly connected to one end of the inner center tube (18). A lower cylinder sleeve (30), one end of which is sleeved on and fixedly connected to an end of the upper piston (27) away from the upper cylinder sleeve (22), and the other end of which is sleeved on the lower joint (37); a lower piston (36) disposed between the lower cylinder sleeve (30) and the inner tube (3), one end of the lower piston (36) being disposed between the upper piston (27) and the lower cylinder sleeve (30), and one end of the lower piston (36) being fixed to the upper piston (27) via a seat seal shear pin (32); A piston locking block (33) is arranged between the lower piston (36) and the inner tube (3); the piston locking block (33) is passed through the upper piston (27) and is located at the second liquid inlet hole on the inner tube (3); After the pressure relief is completed during setting, a normal pressure chamber is formed between the second baffle ring (24), the upper piston (27), the inner tube (3) and the upper cylinder sleeve (22).

2. A Y342 constant force hydraulic packer according to claim 1, characterized in that: A first rubber ring (2) is provided between the upper joint (1) and the inner tube (3), and the first rubber ring (2) is clamped on the inner wall of the upper joint (1). A second rubber ring (4) is provided between the balancing cylinder sleeve (5) and the inner tube (3), and the second rubber ring (4) is clamped on the inner wall of the balancing cylinder sleeve (5).

3. A Y342 constant force hydraulic packer according to claim 1, characterized in that: A third rubber ring (6) is clamped on the outer wall of the balancing piston (9), a fourth rubber ring (8) is clamped on the inner wall of the balancing piston (9), a fifth rubber ring (10) is clamped on the outer wall of the well-washing piston (7), and a sixth rubber ring (13) is clamped on the inner wall of the well-washing seat (14).

4. A Y342 constant force hydraulic packer according to claim 1, characterized in that: At least one seventh rubber ring (25) is clamped on the inner wall of the second baffle ring (24), at least one eighth rubber ring (26) is clamped on the outer wall of the second baffle ring (24), a ninth rubber ring (28) is provided between the upper piston (27) and the upper cylinder sleeve (22), the ninth rubber ring (28) is clamped on the outer wall of the upper piston (27), at least one tenth rubber ring (29) is clamped on the inner wall of the upper piston (27), an eleventh rubber ring (31) is provided between the upper piston (27) and the lower cylinder sleeve (30), the eleventh rubber ring (31) is clamped on the outer wall of the upper piston (27), at least one twelfth rubber ring (34) is clamped on the outer wall of the lower piston (36), and at least one thirteenth rubber ring (35) is clamped on the inner wall of the lower piston (36).

5. A Y342 constant force hydraulic packer according to claim 1, characterized in that: A plurality of fourteenth rubber rings (38) are clamped on the interior of the lower joint (37), and a centering retaining ring (39) is sleeved on the lower joint (37) and fixedly connected thereto, with one end of the centering retaining ring (39) abutting against one end of the lower cylinder sleeve (30).

Images