Double-seal long-acting well-flushing packer

Abstract

The utility model relates to the technical field of oil and gas exploitation, in particular to a double-sealing long-acting well-flushing packer, which comprises an upper joint, an upper core tube, a lower core tube, a lower joint, two pressure sealing rubber sleeves and a plurality of sealing rings, the upper end of the upper core pipe is connected with the upper connector, the lower end of the upper core pipe is connected with the lower core pipe, the lower end of the lower core pipe is connected with the lower connector, the double-sealing long-acting well-flushing packer is sequentially provided with the well-flushing cylinder, the well-flushing valve, the steel ball centralizing device and the setting device, and all the devices can work in a matched mode to achieve setting and well-flushing operation at the same time. According to the double-seal long-acting well-flushing packer, the sealing performance of the packer is enhanced, well flushing operation is allowed, sealing of the packer is not affected, the stability and accuracy of the packer in the well descending process are guaranteed through the setting device and the steel ball centralizing device, and the purposes of reducing construction cost and operation intensity are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas exploitation, in particular to a double-sealed long-acting washable well packer. Background Art

[0002] Downhole packers are crucial equipment in oilfield development. They are used to isolate different oil layers or water injection layers in the wellbore to achieve stratified production or water injection. With the advancement of science and technology, the design and manufacturing technology of downhole packers have made significant progress, but there are still some problems in practical application.

[0003] After working underground for a long time, the packer may fail to seal, which may cause fluid crossflow between different layers. For example, water injection may cause water layer interference, reduce water injection efficiency and the ultimate recovery rate of the oil layer. The selection and application of packers under different well conditions need to be accurately matched to ensure the best operation effect. For some special well conditions, such as deep wells, ultra-deep wells, horizontal wells, multi-branch wells, etc., the existing packers cannot fully meet the standards. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The utility model provides a double-sealed long-acting well-washing packer, so as to overcome the problem in the prior art that a single packer cannot meet the requirements of high pressure bearing and well-washing at the same time.

[0006] (II) Technical solution

[0007] To achieve the above purpose, the utility model provides a double-sealed long-acting washable well packer, comprising: an upper joint, an upper core pipe, a lower core pipe, a lower joint, two compression seal rubber tubes and a plurality of sealing rings;

[0008] The two pressure-sealing rubber cylinders include: a first pressure-sealing rubber cylinder and a second pressure-sealing rubber cylinder;

[0009] The upper end of the upper core tube is provided with an upper joint, the lower end is provided with a lower core tube, the lower end of the lower core tube is provided with a lower joint, a sealing ring is provided between the lower core tube and the lower joint, and the upper end of the lower core tube is provided with a step on the outer edge;

[0010] The outer wall of the upper joint is sleeved with a well-washing cylinder, which connects the upper joint and the well-washing valve, which is sleeved on the upper core pipe, and a flow pipe is provided in the well-washing valve, and sealing rings are respectively provided between the flow pipe, the well-washing valve and the upper core pipe, and the outer wall of the lower joint is sleeved with a sealing cylinder, and the inner wall of the sealing cylinder is connected with a pushing cylinder, which is arranged on the sealing head, and the sealing head is covered with a plurality of sealing rings, and the upper end of the lower joint is provided with a sealing device, which is sleeved on the upper core pipe and the lower core pipe, and the upper end of the sealing device is provided with a steel ball straightening device;

[0011] The outer wall of the flow tube is provided with a through hole penetrating the upper core tube, and a gap is provided between the flow tube and the upper core tube.

[0012] Preferably, the setting device comprises: a polymer protection ring, two compression seal rubber cylinders, a barrier ring, a compression seal rubber cylinder release head, a rubber cylinder head, an expansion seal rubber cylinder, a compression seal sliding sleeve, a setting pin, an expansion seal cone, a release pin, a locking ring and a locking ring cap;

[0013] The expansion and sealing cone is arranged between the pushing cylinder and the lower core tube, the polymer protection ring, the first pressure-sealing rubber cylinder, the barrier ring, the second pressure-sealing rubber cylinder and the pressure-sealing rubber cylinder release head are sequentially sleeved on the upper core tube from top to bottom, the lower end of the pressure-sealing rubber cylinder release head is respectively provided with a rubber cylinder head and an expansion and sealing rubber cylinder, the upper end of the expansion and sealing rubber cylinder is embedded in the pressure-sealing rubber cylinder release head, the lower end of the rubber cylinder head is provided with a pressure-sealing sliding sleeve, the expansion and sealing rubber cylinder is arranged on the outer wall of the rubber cylinder head and the pressure-sealing sliding sleeve, the expansion and sealing cone is arranged between the pressure-sealing sliding sleeve and the setting cylinder, and the pressure-sealing sliding sleeve, the setting cylinder and the expansion and sealing cone are connected by a plurality of setting pins;

[0014] A locking ring, a locking ring cap and an unsealing pin are arranged on the step of the outer edge of the upper end of the lower core tube. The unsealing pin fixes the locking ring cap on the lower core tube, and a locking ring is arranged on the outer wall of the unsealing pin.

[0015] Preferably, the lower end of the expanding and sealing rubber cylinder is a conical structure, and the expanding and sealing cone consists of two parts. The upper end of the expanding and sealing cone is a conical structure and the lower end is a hollow cylindrical structure. The hollow cylindrical structure at the lower end of the expanding and sealing cone is provided with a through hole, and the conical structure at the upper end of the expanding and sealing cone matches the taper of the conical structure at the lower end of the expanding and sealing rubber cylinder.

[0016] Preferably, the steel ball straightening device comprises: a convex rubber ring anti-slip ring, a convex rubber ring, a thrust ring, a straightening ball bracket, a plurality of straightening balls and two pressure ball covers;

[0017] The thrust ring is sleeved on the outer wall of the flow tube, a convex rubber ring and a convex rubber ring anti-slip ring are provided at the upper end of the thrust ring, a straightening ball bracket and a pressure ball cover are provided at the lower end of the thrust ring, the straightening ball bracket is sleeved on the flow tube, two pressure ball covers are provided on the inner wall of the straightening ball bracket, and a plurality of straightening balls are provided between the two pressure ball covers.

[0018] Preferably, the thrust ring consists of two parts, the upper end of the thrust ring is a hollow cylindrical structure and the lower end is a hollow truncated cone structure, the righting ball bracket is a hollow cylindrical structure, both ends of the righting ball bracket are provided with steps extending inward, the two pressure ball covers are respectively close to the inner walls of the steps provided at both ends of the righting ball bracket, a gap is provided between the upper end of the righting ball bracket and the flow tube, the lower end of the righting ball bracket is close to the flow tube, the truncated cone structure at the lower end of the thrust ring is inserted into the gap provided between the righting ball bracket and the flow tube, the outer wall of the righting device bracket is provided with a plurality of through holes, the through holes are provided between the two pressure ball covers, and the number of through holes matches the number of righting balls.

[0019] Preferably, the outer diameter of the hollow cylindrical structure at the upper end of the thrust ring matches the outer diameter of the righting ball bracket, and the thrust ring limits the righting ball bracket.

[0020] Preferably, the convex rubber ring anti-slip ring is arranged on the inner wall of the well flushing valve, the convex rubber ring is arranged on the top of the thrust ring, the convex rubber ring anti-slip ring matches the size of the convex rubber ring, and the convex rubber ring anti-slip ring limits the convex rubber ring.

[0021] Preferably, the inner wall of the pushing cylinder is provided with a step extending inwardly, the size of the step matches the locking ring, and the step limits the locking ring.

[0022] Preferably, the two ball-pressing covers limit the position of the righting ball, and the inner wall size of the ball-pressing covers matches that of the righting ball.

[0023] Preferably, the compression-sealing rubber tube is made of rubber, and the compression-sealing rubber tube can expand outwards under the action of extrusion.

[0024] (III) Beneficial effects

[0025] The utility model provides a double-seal long-acting well-washable packer, which can enhance the sealing performance of the packer through two pressure-sealed rubber tubes, effectively prevent fluid leakage in the wellbore, and ensure the production efficiency of the oil and gas well; by arranging a plurality of sealing rings, the sealing reliability of the entire packer is further improved; by arranging a well-washing cylinder, a well-washing valve and a flow pipe, well-washing operations can be carried out without affecting the sealing of the packer, dirt in the wellbore can be removed, the oil well can be kept unobstructed and the production can be increased; by arranging a sealing device and a steel ball straightening device, the positioning accuracy and stability of the packer during the well-running process are ensured, and production problems caused by the instability of downhole tools are avoided; the components of the double-seal long-acting well-washable packer cooperate closely with each other, the operation is simple, and it is easy to construct on site, and it is suitable for oil and gas well construction under different formation conditions, thereby achieving the purpose of effectively reducing construction costs and alleviating work intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The utility model shows a schematic diagram of the structure of a double-seal long-acting washable well packer.

[0027] Among them: 1: upper joint; 2: well washing cylinder; 3: upper core pipe; 4: well washing valve; 5: flow pipe; 6: convex rubber ring anti-slip ring; 7: convex rubber ring; 8: thrust ring; 9: righting ball bracket; 10: pressure ball cover; 11: polymer protection ring; 12: pressure sealing rubber cylinder; 13: barrier ring; 14: pressure sealing rubber cylinder release head; 15: rubber cylinder head; 16: expansion sealing rubber cylinder; 17: pressure sealing sliding sleeve; 18: setting pin; 19: expansion sealing cone; 20: setting cylinder; 21: lower core pipe; 22: release pin; 23: locking ring; 24: locking ring cap; 25: push cylinder; 26: setting head; 27: lower joint; 28: righting ball; 29: sealing ring. DETAILED DESCRIPTION

[0028] The utility model is described in detail below with reference to the accompanying drawings and embodiments.

[0029] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by "up", "down", "left", "right", "inside", "outside", "top" and "bottom" are all based on the directions or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the referred parts must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] like Figure 1 As shown, the utility model provides a double-sealed long-term washable well packer, comprising: an upper joint 1, an upper core pipe 3, a lower core pipe 21, a lower joint 27, two compression seal rubber tubes 12 and a plurality of sealing rings 29;

[0031] The upper end of the upper core tube 3 is provided with an upper joint 1, and the lower end is provided with a lower core tube 21. The lower end of the lower core tube 21 is provided with a lower joint 27. A sealing ring 29 is provided between the lower core tube 21 and the lower joint 27 to ensure sealing. The upper end of the lower core tube 21 is provided with a step on the outer edge. The outer wall of the upper joint 1 is sleeved with a well washing cylinder 2. The well washing cylinder 2 connects the upper joint 1 and the well washing valve 4. The well washing valve 4 is sleeved on the upper core tube 3 to control the flow of fluid. A flow pipe 5 is provided inside the well washing valve 4. The outer wall of the flow pipe 5 is provided with a through hole that penetrates the upper core tube 3. A gap is provided between the flow pipe 5 and the upper core tube 3. The flow pipe 5 is in the well washing valve. 4 and the upper core pipe 3 play a role in controlling conduction, the flow pipe 5 and the well washing valve 4 and the upper core pipe 3 are respectively provided with sealing rings 29, the outer wall of the lower joint 27 is sleeved with a sealing cylinder 20, the inner wall of the sealing cylinder 20 is connected with a pushing cylinder 25, a sealing head 26 is provided between the pushing cylinder 25 and the sealing cylinder 20, and the sealing head 26 is covered with a plurality of sealing rings 29 to seal the gap, a sealing device is provided between the upper joint 1 and the lower joint 27, the sealing device is used to fix the position of the tool in the well, the sealing device is sleeved on the upper core pipe 3 and the lower core pipe 21, and the flow pipe 5 is connected with the sealing device;

[0032] When well washing is being carried out, the casing pressure is higher than the oil layer pressure, which will cause the well washing valve 4 to open the through hole on the flow tube 5, and the liquid enters the gap between the flow tube 5 and the upper core tube 3 through the through hole provided on the outer wall of the flow tube 5. The liquid passes through the gap between the flow tube 5 and the upper core tube 3, and finally flows through the sealing device and is discharged through the expansion cone 19 in the sealing device, thereby realizing reverse circulation well washing.

[0033] The sealing device comprises: a polymer protection ring 11, a compression seal rubber tube 12, a barrier ring 13, a compression seal rubber tube release head 14, a rubber tube head 15, an expansion seal rubber tube 16, a compression seal sliding sleeve 17, a sealing pin 18, an expansion seal cone 19, an unsealing pin 22, a locking ring 23 and a locking ring cap 24, and the two compression seal rubber tubes 12 comprise: a first compression seal rubber tube and a second compression seal rubber tube;

[0034] The expansion cone 19 is arranged between the pushing cylinder 25 and the lower core tube 21. The polymer protection ring 11, the first pressure-sealing rubber cylinder, the barrier ring 13, the second pressure-sealing rubber cylinder and the pressure-sealing rubber cylinder release head 14 are sequentially sleeved on the upper core tube 3 from top to bottom. The lower end of the pressure-sealing rubber cylinder release head 14 is respectively provided with a rubber cylinder head 15 and an expansion rubber cylinder 16. The upper end of the expansion rubber cylinder 16 is embedded in the pressure-sealing rubber cylinder release head 14. The lower end of the rubber cylinder head 15 is provided with a pressure-sealing sliding sleeve 17. The expansion rubber cylinder 16 is arranged on the outer wall of the rubber cylinder head 15 and the pressure-sealing sliding sleeve 17. The expansion cone 19 is arranged between the pressure-sealing sliding sleeve 17 and the setting cylinder 20. The pressure-sealing sliding sleeve 17, the setting cylinder 20 and the expansion cone 19 are connected by a plurality of setting pins 18. Then, a locking ring 23, a locking ring cap 24 and an unsealing pin 22 are provided on the step at the outer edge of the upper end of the lower core tube 21. The unsealing pin 22 fixes the locking ring cap 24 on the lower core tube 21. The outer wall of the unsealing pin 22 is provided with a locking ring 23. The lower end of the expansion rubber tube 16 is a conical structure. The expansion cone 19 is composed of two parts. The upper end of the expansion cone 19 is a conical structure and the lower end is a hollow cylindrical structure. The hollow cylindrical structure at the lower end of the expansion cone 19 is provided with a through hole. The conical structure at the upper end of the expansion cone 19 matches the taper of the conical structure at the lower end of the expansion rubber tube 16. The inner wall of the pushing cylinder 25 is provided with a step extending inwardly. The size of the step matches the locking ring 23, and the step limits the locking ring 23.

[0035] The polymer protection ring 11 is arranged above the pressure-sealing rubber tube 12 in the setting device. The polymer protection ring 11 is used to protect the pressure-sealing rubber tube 12 from damage caused by excessive stress and provide support when the pressure-sealing rubber tube 12 is expanded. The first pressure-sealing rubber tube is located below the polymer protection ring 11. The pressure-sealing rubber tube 12 is made of rubber. The pressure-sealing rubber tube 12 can expand outward when squeezed and is used to expand and seal the wellbore during the setting operation. The barrier ring 13 is arranged below the first pressure-sealing rubber tube. The barrier ring 13 supports the expansion of the first and second pressure-sealing rubber tubes as a supporting structure. The expansion rubber tube 16 is located below the rubber tube head 15. The expansion rubber tube 16 is expanded by the expansion cone 19 during the setting process, and the pressure-sealing rubber tube 12 is compressed at the same time. The setting pin 18 plays a role of connection and support during the setting process to ensure that each component can operate correctly;

[0036] During the sealing process of the packer, pressure is applied from the inside of the oil pipe, and the high-pressure liquid is transmitted to the lower end of the sealing head 26 through the central hole of the lower core tube 21. The pressure causes the sealing head 26 to move upward, pushing the pushing cylinder 25, the sealing sleeve 17, the expanding rubber cylinder 16 and the sealing rubber cylinder release head 14 to compress the sealing rubber cylinder 12 and the polymer protection ring 11. When the sealing rubber cylinder 12 and the polymer protection ring 11 are expanded and compacted, the pushing cylinder 25 continues to move upward until the expanding cone 19 is pushed by the pressure to shear off the sealing pin 18, the expanding rubber cylinder 16 is propped outward, and the sealing operation is completed. The locking ring 23 engages with the step provided on the inner wall of the pushing cylinder 25, and the packer is locked in place to ensure that the packer will not be displaced during subsequent production or water injection operations.

[0037] During the pressure-bearing process of the packer, when the high-pressure liquid pushes the seating head 26 to expand the pressure-sealing rubber tube 12, the polymer protection ring 11 will also expand accordingly. The polymer protection ring 11 protects the pressure-sealing rubber tube 12 from damage caused by excessive stress, and thus can extend the working life of the pressure-sealing rubber tube 12. When the polymer protection ring 11 is under pressure, it can evenly disperse the pressure, avoiding the risk of premature failure of the pressure-sealing rubber tube 12 due to excessive local force, so that the packer can withstand greater upper pressure. At the same time, the expansion cone 19 is inserted from the lower end into the lower end of the expansion rubber tube 16, and the expansion rubber tube 16 is propped open under the action of pressure for sealing. As the lower pressure increases, the sealing force between the edge of the expansion rubber tube 16 and the inner wall of the casing also increases, which enables the packer to withstand higher lower pressure.

[0038] During the unsealing process of the packer, the upper core tube 3, the lower core tube 21 and the lower joint 27 produce relative displacement with the pressure-sealing rubber tube 12, the pressure-sealing rubber tube release head 14, the pressure-sealing sliding sleeve 17, the expansion-sealing rubber tube 16, the expansion-sealing cone 19, the pushing tube 25 and the seating head 26 due to its elasticity and the friction with the inner wall of the casing, resulting in the shearing of the unsealing pin 22. Once the unsealing pin 22 is sheared, continuing to lift the oil tubing will cause the expansion-sealing cone 19 to withdraw from the expansion-sealing rubber tube 16, which allows the expansion-sealing rubber tube 16 to retract. As the expansion-sealing rubber tube 16 retracts, the pressure-sealing rubber tube 12 recovers its original shape by relying on its own elasticity, thereby releasing the sealing state of the packer.

[0039] The upper end of the sealing device is provided with a steel ball straightening device, which includes: a convex rubber ring anti-slip ring 6, a convex rubber ring 7, a thrust ring 8, a straightening ball bracket 9, a plurality of straightening balls 28 and two pressure ball covers 10. The thrust ring 8 is sleeved on the outer wall of the flow pipe 5. The upper end of the thrust ring 8 is provided with a convex rubber ring 7 and a convex rubber ring anti-slip ring 6. The convex rubber ring anti-slip ring 6 is arranged on the inner wall of the well washing valve 4. The convex rubber ring 7 is arranged on the top of the thrust ring 8. The convex rubber ring anti-slip ring 6 and the convex rubber ring anti-slip ring 6 are arranged on the inner wall of the well washing valve 4. The convex rubber ring 7 is arranged on the top of the thrust ring 8. The size of the rubber ring 7 matches, the convex rubber ring anti-slip ring 6 limits the convex rubber ring 7, and the convex rubber ring anti-slip ring 6 prevents the convex rubber ring 7 from falling off the thrust ring 8. The lower end of the thrust ring 8 is provided with a straightening ball bracket 9 and a pressure ball cover 10. The straightening ball bracket 9 is sleeved on the flow tube 5. Two pressure ball covers 10 are provided on the inner wall of the straightening ball bracket 9. A plurality of straightening balls 28 are provided between the two pressure ball covers 10. The straightening ball bracket 9 is a hollow cylindrical structure, and both ends of the straightening ball bracket 9 are provided with a straightening ball 28. The steps extending inward provide mounting surfaces for the two pressure ball covers 10 respectively, and apply pressure to the straightening ball 28, so that the straightening ball 28 protrudes and straightens the packer under the constraint of the pressure ball cover 10. The thrust ring 8 is composed of two parts. The upper end of the thrust ring 8 is a hollow cylindrical structure and the lower end is a hollow truncated cone structure. A gap is provided between the upper end of the straightening ball bracket 9 and the flow pipe 5. The lower end of the straightening ball bracket 9 is close to the flow pipe 5. The truncated cone structure at the lower end of the thrust ring 8 is inserted into the straightening ball In the gap between the bracket 9 and the flow tube 5, the outer wall of the centralizer bracket 9 is provided with a plurality of through holes, the through holes are provided between the two pressure ball covers 10, the number of through holes matches the number of the centralizing balls 28, the outer diameter size of the hollow cylindrical structure at the upper end of the thrust ring 8 matches the outer diameter size of the centralizing ball bracket 9, the thrust ring 8 limits the centralizing ball bracket 9, the two pressure ball covers 10 limit the centralizing balls 28, and the inner wall size of the pressure ball cover 10 matches the centralizing balls 28;

[0040] During the packer setting process, the steel ball straightening device straightens the packer through the straightening ball 28, ensuring that the packer can be accurately aligned with the wellbore centerline during the setting operation to avoid possible tilting or rotation;

[0041] When the packer starts to seal, the polymer protection ring 11 will first expand and squeeze the righting ball bracket 9, forcing the righting ball bracket 9 to move upward along the flow tube 5. As the righting ball bracket 9 rises, the truncated cone structure at the lower end of the thrust ring 8 is inserted into the preset gap between the righting ball bracket 9 and the flow tube 5. The truncated cone structure at the lower end of the thrust ring 8 squeezes the righting ball 28 out of the righting ball bracket 9. When the righting ball bracket 9 rises, it is limited by the thrust ring 8. A part of the righting ball 28 protrudes from the righting ball bracket 9 and is limited by the pressure ball covers 10 at both ends to prevent the righting ball 28 from excessive movement or falling off, so that the righting ball 28, the righting ball bracket 9 and the two pressure ball covers 10 form a pulley mechanism, which can effectively contact the wellbore wall and provide necessary support force during the continued lowering of the packer, ensuring that the axis of the packer is always consistent with the center line of the lowered wellbore.

[0042] The actual working scenario of a double-seal long-term washable well packer is introduced in detail below.

[0043] In actual work, after the double-seal long-term flushable well packer is assembled on the ground, it is connected to the oil pipe and lowered into the oil well. When the double-seal long-term flushable well packer reaches the predetermined position, pressure is applied to the packer through ground operation to perform the setting operation. Pressure is applied from the inside of the oil pipe, and high-pressure liquid is transmitted to the lower end of the setting head 26 through the central hole of the lower core pipe 21. The pressure causes the setting head 26 to move upward, pushing the pushing cylinder 25, the pressure sealing sliding sleeve 17, the expansion sealing rubber cylinder 16 and the pressure sealing rubber cylinder release head 14. The compression seal rubber tube 12 and the polymer protection ring 11 are compressed. When the compression seal rubber tube 12 and the polymer protection ring 11 are expanded and compacted, the push cylinder 25 continues to move upward until the expansion cone 19 is pushed by the pressure to shear off the sealing pin 18, and the expansion seal rubber tube 16 is propped up outward to complete the sealing operation. The locking ring 23 is engaged with the step provided on the inner wall of the push cylinder 25, and the packer is locked in place to ensure that the packer will not be displaced in subsequent production or water injection operations; when the double-seal long-term washable well packer is in place, the packer will not be displaced. When performing well washing operation, the well washing valve 4 opens the through hole on the flow pipe 5, and the liquid enters the gap between the flow pipe 5 and the upper core pipe 3 through the through hole on the outer wall of the flow pipe 5. The liquid passes through the gap between the flow pipe 5 and the upper core pipe 3, and finally flows through the setting device and is discharged through the expansion cone 19 in the setting device, thereby realizing reverse circulation well washing; when the double-seal long-term well washing packer is unsealed, the upper lifting pipe column presses the sealing rubber cylinder 12 due to its elasticity and the friction with the inner wall of the casing, so that the upper core pipe 3, the lower core pipe 21 and The lower joint 27 and the compression seal rubber tube 12, the compression seal rubber tube release head 14, the compression seal sliding sleeve 17, the expansion seal rubber tube 16, the expansion seal cone 19, the pushing tube 25, and the seating head 26 produce relative displacement, resulting in the shearing of the unsealing pin 22. Once the unsealing pin 22 is sheared, continuing to lift the oil pipe string will cause the expansion seal cone 19 to withdraw from the expansion seal rubber tube 16, which allows the expansion seal rubber tube 16 to retract. As the expansion seal rubber tube 16 retracts, the compression seal rubber tube 12 relies on its own elasticity to restore its original shape, thereby releasing the sealing state of the packer.

[0044] It can be understood that the above-mentioned various embodiments mentioned in the present invention can be combined with each other to form a combined embodiment without violating the principle logic. Due to space limitations, the present invention will not elaborate on them.

[0045] Those skilled in the art will appreciate that, in the above method of specific implementation, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0046] The utility model provides a double-seal long-acting well-washable packer, which enhances the sealing performance of the packer by two compression-sealing rubber tubes 12, effectively prevents fluid leakage in the wellbore, and ensures the production efficiency of the oil and gas wells; by arranging a plurality of sealing rings 29, the sealing reliability of the entire packer is further improved; by arranging the well-washing cylinder 2, the well-washing valve 4 and the flow pipe 5, the well-washing operation can be carried out without affecting the sealing of the packer, the dirt in the wellbore can be removed, the oil well can be kept unobstructed and the production can be increased; by arranging the sealing device and the steel ball straightening device, the positioning accuracy and stability of the packer during the well-drilling process are ensured, and the production problems caused by the instability of the downhole tools are avoided; the various components of the double-seal long-acting well-washable packer cooperate closely with each other, the operation is simple, and it is easy to construct on site, and it is suitable for the construction of oil and gas wells under different formation conditions, thereby achieving the purpose of effectively reducing the construction cost and alleviating the operation intensity.

[0047] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A double-seal long-term washable well packer, characterized in that: include: An upper joint (1), an upper core tube (3), a lower core tube (21), a lower joint (27), two compression sealant tubes (12) and a plurality of sealing rings (29); The two pressure-sealing rubber cylinders (12) comprise: a first pressure-sealing rubber cylinder and a second pressure-sealing rubber cylinder; The upper end of the upper core tube (3) is provided with an upper joint (1), the lower end is provided with a lower core tube (21), the lower end of the lower core tube (21) is provided with a lower joint (27), a sealing ring (29) is provided between the lower core tube (21) and the lower joint (27), and the upper end of the lower core tube (21) is provided with a step on the outer edge; The upper joint (1) is sheathed with a well-washing cylinder (2) on its outer wall, the well-washing cylinder (2) is connected to the upper joint (1) and the well-washing valve (4), the well-washing valve (4) is sheathed on the upper core tube (3), a flow pipe (5) is provided in the well-washing valve (4), sealing rings (29) are respectively provided between the flow pipe (5), the well-washing valve (4) and the upper core tube (3), the lower joint (27) is sheathed with a setting cylinder (20), the inner wall of the setting cylinder (20) is connected to a pushing cylinder (25), the pushing cylinder (25) is provided on a setting head (26), the setting head (26) is sheathed with a plurality of sealing rings (29), the upper end of the lower joint (27) is provided with a setting device, the setting device is sheathed on the upper core tube (3) and the lower core tube (21), and the upper end of the setting device is provided with a steel ball straightening device; The outer wall of the flow tube (5) is provided with a through hole penetrating the upper core tube (3), and a gap is provided between the flow tube (5) and the upper core tube (3).

2. The double-seal long-term flushable well packer according to claim 1 is characterized in that: The sealing device comprises: a polymer protection ring (11), two compression seal rubber cylinders (12), a barrier ring (13), a compression seal rubber cylinder release head (14), a rubber cylinder head (15), an expansion seal rubber cylinder (16), a compression seal sliding sleeve (17), a sealing pin (18), an expansion seal cone (19), a release pin (22), a locking ring (23) and a locking ring cap (24); The expansion cone (19) is arranged between the pushing cylinder (25) and the lower core tube (21); the polymer protection ring (11), the first pressure-sealing rubber cylinder, the barrier ring (13), the second pressure-sealing rubber cylinder and the pressure-sealing rubber cylinder release head (14) are sequentially sleeved on the upper core tube (3) from top to bottom; the lower end of the pressure-sealing rubber cylinder release head (14) is respectively provided with a rubber cylinder head (15) and an expansion rubber cylinder (16); the upper end of the expansion rubber cylinder (16) is embedded in the pressure-sealing rubber cylinder release head (14); the lower end of the rubber cylinder head (15) is provided with a pressure-sealing sliding sleeve (17); the expansion rubber cylinder (16) is arranged on the outer wall of the rubber cylinder head (15) and the pressure-sealing sliding sleeve (17); the expansion cone (19) is arranged between the pressure-sealing sliding sleeve (17) and the setting cylinder (20); the pressure-sealing sliding sleeve (17), the setting cylinder (20) and the expansion cone (19) are connected by a plurality of setting pins (18); A locking ring (23), a locking ring cap (24) and an unsealing pin (22) are provided on the step at the outer edge of the upper end of the lower core tube (21); the unsealing pin (22) fixes the locking ring cap (24) on the lower core tube (21); and a locking ring (23) is provided on the outer wall of the unsealing pin (22).

3. The double-seal long-term flushable well packer according to claim 2 is characterized in that: The lower end of the expansion and sealing rubber cylinder (16) is a conical structure, and the expansion and sealing cone (19) is composed of two parts. The upper end of the expansion and sealing cone (19) is a conical structure and the lower end is a hollow cylindrical structure. The hollow cylindrical structure at the lower end of the expansion and sealing cone (19) is provided with a through hole. The conical structure at the upper end of the expansion and sealing cone (19) matches the taper of the conical structure at the lower end of the expansion and sealing rubber cylinder (16).

4. The double-seal long-term flushable well packer according to claim 2, characterized in that: The steel ball straightening device comprises: a convex rubber ring anti-slip ring (6), a convex rubber ring (7), a thrust ring (8), a straightening ball bracket (9), a plurality of straightening balls (28) and two pressure ball covers (10); The thrust ring (8) is sleeved on the outer wall of the flow tube (5), the upper end of the thrust ring (8) is provided with a convex rubber ring (7) and a convex rubber ring anti-slip ring (6), the lower end of the thrust ring (8) is provided with a straightening ball bracket (9) and a pressure ball cover (10), the straightening ball bracket (9) is sleeved on the flow tube (5), the inner wall of the straightening ball bracket (9) is provided with two pressure ball covers (10), and a plurality of straightening balls (28) are provided between the two pressure ball covers (10).

5. The double-seal long-term flushable well packer according to claim 4 is characterized in that: The thrust ring (8) is composed of two parts. The upper end of the thrust ring (8) is a hollow cylindrical structure and the lower end is a hollow truncated cone structure. The righting ball bracket (9) is a hollow cylindrical structure. Both ends of the righting ball bracket (9) are provided with steps extending inward. The two pressure ball covers (10) are respectively in close contact with the inner walls of the steps provided at both ends of the righting ball bracket (9). A gap is provided between the upper end of the righting ball bracket (9) and the flow tube (5). The lower end of the righting ball bracket (9) is in close contact with the flow tube (5). The truncated cone structure at the lower end of the thrust ring (8) is inserted into the gap provided between the righting ball bracket (9) and the flow tube (5). The outer wall of the righting ball bracket (9) is provided with a plurality of through holes. The through holes are provided between the two pressure ball covers (10). The number of through holes matches the number of the righting balls (28).

6. The double-seal long-term flushable well packer according to claim 5, characterized in that: The outer diameter of the hollow cylindrical structure at the upper end of the thrust ring (8) matches the outer diameter of the righting ball bracket (9), and the thrust ring (8) limits the position of the righting ball bracket (9).

7. The double-seal long-term flushable well packer according to claim 4, characterized in that: The convex rubber ring anti-slip ring (6) is arranged on the inner wall of the well flushing valve (4), and the convex rubber ring (7) is arranged on the top of the thrust ring (8). The convex rubber ring anti-slip ring (6) matches the convex rubber ring (7) in size, and the convex rubber ring anti-slip ring (6) limits the convex rubber ring (7).

8. The double-seal long-term flushable well packer according to claim 1, characterized in that: The inner wall of the pushing cylinder (25) is provided with a step extending inwardly, the size of the step matches that of the locking ring (23), and the step limits the locking ring (23).

9. The double-seal long-term flushable well packer according to claim 4, characterized in that: The two ball-pressing covers (10) limit the position of the straightening ball (28), and the inner wall size of the ball-pressing cover (10) matches that of the straightening ball (28).

10. The double-seal long-term flushable well packer according to claim 1, characterized in that: The compression-sealing rubber tube (12) is made of rubber, and the compression-sealing rubber tube (12) can expand outwards under the action of squeezing.

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