A fishable and drillable long-lasting separation tool

Abstract

The utility model relates to a long -efficacy isolation and exploitation tool of fishing and drilling, including upper joint, center tube, piston cylinder, rubber cylinder seat, outer center tube and lower joint, the upper joint inside and outside all are equipped with thread, and the upper joint is connected with the center tube through inner thread and is connected with the piston cylinder through outer thread, still be provided with for locking piston cylinder and ring on the upper joint, the center tube is equipped with inner piston, is equipped with outer piston on the inner piston, the center tube still has the positioning ring of bushing, and is connected as an organic whole with outer center tube through the drop hand pin, is provided with the fishing head in the upper end portion of outer center tube, the fishing head is connected with the lock ring seat through the unsealing pin, the rubber cylinder seat bushing is connected on the outer center tube, and the rubber cylinder seat lower extreme sets up upper cone, slip and lower cone in proper order, and the lower cone lower extreme is connected with the unsealing head, and is connected with the rubber cylinder sealing seat through the unsealing limit pin, and its lower connection has the expansion rubber cylinder and spring seat, it is a long -efficacy isolation and exploitation tool of fishing and drilling and drilling core component again not easy to cause the overhaul.

Description

Technical Field

[0001] This utility model relates to the field of oilfield development technology, and in particular to a long-lasting, extractable, and drillable isolation tool for use in oil wells. Background Technology

[0002] As oil well development progresses and water injection intensifies, the workload of water control in oil production is gradually increasing. Currently, the commonly used methods in oilfields are production tubing with built-in packers or drop-out packers. Both methods have certain drawbacks: 1. When using packers without slips, the packers are subject to the creep of the production tubing, making them prone to loss of seal and resulting in a short lifespan; 2. When using packers with slips, the tubing is pressed down to set the seal, causing tubing bending, severe wear of the tubing, or corrosion of the original well tubing making it difficult to remove the packers buried in sand or scale or corroded and stuck in the wellbore; 3. Drop-out packers left in the well for a long time corrode and scale, making retrieval difficult, easily leading to major workovers, and increasing operating costs. Utility Model Content

[0003] In order to solve the problems of complex casing damage, difficulty in setting and sealing wells, short isolation production period, and difficulty in retrieval and major repair due to corrosion and scaling in the existing technology, the purpose of this utility model is to overcome the above-mentioned shortcomings and propose a long-lasting isolation production tool that can be retrieved and drilled. It is a long-lasting isolation production tool that can retrieve and drill out core components without causing major repairs.

[0004] The technical solution of this utility model is: A long-lasting, retrieval and drilling-capable mining tool includes an upper connector, a central tube, a piston cylinder, a rubber sleeve seat, an outer central tube, and a lower connector; The upper connector is threaded both internally and externally. The upper connector is connected to the central tube via the internal thread and to the piston cylinder via the external thread. The upper connector is also equipped with a locking ring for locking the piston cylinder. An inner piston is mounted on the central tube, and an outer piston is mounted on the inner piston. A split push sleeve is threaded to the lower end of the outer piston, and a locking sleeve is connected to the lower end of the split push sleeve. A positioning ring is also fitted onto the central tube, and the positioning ring is located above the locking sleeve. The central tube is connected to the outer central tube as a whole via a release pin. A retrieval head is provided at the upper end of the outer central tube. The retrieval head is connected to a locking ring seat via a release pin. A rubber sleeve seat is fitted onto the outer central tube, and the lower connector is connected to the lower end of the outer central tube.

[0005] Furthermore, the locking ring seat is equipped with a locking ring, and an overload ring is provided on the outer central tube at the lower end of the locking ring; an upper connector, a rubber tube upper retaining ring, a spacer ring, and a Y-sealing rubber tube are sequentially sleeved on the rubber tube seat from top to bottom, and the upper end of the upper connector is connected to the lower end of the locking sleeve; an upper cone, a slip, and a lower cone are sequentially provided at the lower end of the rubber tube seat, and a release head is connected to the lower end of the lower cone; the release head is connected to the rubber tube sealing seat through a release limiting pin; an expanding rubber tube is connected to the lower end of the rubber tube sealing seat, a spring seat is connected to the lower end of the expanding rubber tube, and a ball seat is provided at the lower end of the central tube.

[0006] Furthermore, it also includes an independent cannula, which includes a straightening head, a production cannula, and a cannula guide cone; the straightening head is fixedly connected to the upper end of the production cannula by an anti-jamming pin, and the lower end of the production cannula is connected to the cannula guide cone by a thread.

[0007] Furthermore, a vulcanizing ring is provided on the lower end of the production tube.

[0008] Furthermore, the spring seat contains a spring and a valve seat, and the lower end of the spring seat is connected to a valve sealing seat.

[0009] Furthermore, the spring seat, spring, valve seat, and valve sealing seat are all sequentially mounted on the outer central tube.

[0010] Furthermore, a locking block is provided at the upper end of the inner piston, and the outer piston and the locking block lock the inner piston onto the upper connector.

[0011] Furthermore, the overload ring is fixed to the outer central tube by an overload pin.

[0012] Furthermore, the lower end of the rubber sleeve seat is threadedly connected to a rubber sleeve lower retaining ring.

[0013] Furthermore, a slip seat for limiting the slip is also provided between the upper and lower cones. Compared with the prior art, the beneficial effects of this utility model are: This invention comprises a piston, a locking ring, and a compression sleeve, with an anti-outburst copper shoulder designed at the end of the sleeve, effectively achieving anti-outburst and long-term sealing functions. The lower seal adopts an expansion seal with a long sealing section, making it highly adaptable to casing. The structure of this invention forms two independent sealing systems; if one sealing system fails, the other can still function normally, truly achieving long-term sealing and isolation.

[0014] The sealing system of this utility model, consisting of a locking sleeve, upper connector, upper retaining ring of the rubber tube, rubber tube, spacer ring, rubber tube seat, and lower retaining ring of the rubber tube, is drillable. After the long-term isolation mining tool is released, the diameter of the locking sleeve at the top is small, eliminating the need for milling. The upper retaining ring and spacer ring of the rubber tube are made of easily drillable composite materials, while the lower retaining ring of the rubber tube is made of ductile iron. Minor repairs can be performed by milling when encountering jams, resulting in low construction costs.

[0015] The production insert of this utility model has a through groove milled on the side of the straightening head, which not only meets the guiding requirements but also has a certain flow prevention and anti-clogging capability. At the same time, the contact between the straightening head and the retrieval head releases force, preventing the central tube from getting stuck due to the change in diameter. The lower end face of the insert guide cone is designed with a large chamfer to ensure smooth re-insertion and prevent the retrieval head from being blocked and unable to be inserted into the outer central tube. In addition, the production insert is longer than the outer central tube, ensuring that the outer central tube will not get blocked.

[0016] The production tube and the outer central tube are in a surface contact seal state, and the long section of the surface contact seal effectively prevents the internal communication between the upper and lower oil layers and the outer central tube.

[0017] Compared with the prior art, this utility model has the following advantages: 1. The sealing and isolation of this utility model lasts longer; 2. The tool is supported by slips and is not affected by the peristalsis of the tubing, resulting in better sealing effect; 3. The slip is located in the middle of the rubber tube, which is not easily corroded, provides long-term anchoring, and ensures reliable unsealing; 4. The tool-made well-keeping parts are easy to mill, with no risk of major overhaul; 5. Multiple methods for unlocking and retrieving the card, resulting in a high success rate; 6. The design includes overload rings, overload pins, and emergency pins to prevent complex construction conditions. 7. The tool-depositing parts can be left in the well for a long time. Pump inspection operations only require reinstalling the insertion pipe. There is no need to repeatedly set the packer, resulting in low production costs. 8. Independent production cannula with reserved functions such as uprighting, emergency release, uprighting protection, and cannula unblocking, making its performance more reliable. Attached Figure Description

[0018] Figure 1-1 This is a cross-sectional view of the left end of the long-lasting, digging-capable, and retrieval-compatible mining tool of this utility model. Figure 1-2 This is a right-end cross-sectional view of the long-lasting, digging-capable, and retrieval-compatible mining tool of this utility model. Figure 2 This is a cross-sectional view of the independent insertion cannula of this utility model; Figure 3-1 This is a left-end sectional view of the present invention when it is applied in a sleeve and is in the first state; Figure 3-2 This is a right-end sectional view of the present invention when it is applied in a sleeve and is in the first state; Figure 4-1 This is a left-end sectional view of the present invention when it is applied in a sleeve and is in the second state; Figure 4-2 This is a right-end sectional view of the present invention when it is applied in a sleeve and is in the second state; Figure 5-1 This is a left-end sectional view of the present invention when it is applied in a sleeve and is in the third state; Figure 5-2 This is a right-end sectional view of the present invention when it is applied in a sleeve and is in the third state; Figure 6-1 This is a left-end sectional view of the present invention when it is applied in a sleeve and is in the fourth state; Figure 6-2This is a right-end sectional view of the present invention when it is applied in a sleeve and is in the fourth state; Figure 7-1 This is a left-end sectional view of the present invention when it is applied in a sleeve and is in the fifth state; Figure 7-2 This is a right-end sectional view of the present invention when it is applied in a sleeve and is in the fifth state; Figure 8-1 This is a left-end sectional view of the present invention when it is applied in a sleeve and is in the sixth state; Figure 8-2 This is a right-end sectional view of the present invention when it is applied in a sleeve and is in the sixth state; Figure 9-1 This is a left-side cross-sectional view of the cannula of this utility model in the inserted state. Figure 9-2 This is a right-side cross-sectional view of the cannula of this utility model in the inserted state. Figure 10-1 This is a left-end sectional view of the present invention when it is applied in a sleeve and is in the seventh state; Figure 10-2 This is a right-end sectional view of the present invention when it is applied in a sleeve and is in the seventh state.

[0019] In the diagram: 1. Upper connector; 2. Parallel ring; 3. Upper locking block; 4. Outer piston; 5. Starting pin; 6. Inner piston; 7. Split push sleeve; 8. Central tube; 9. Piston cylinder; 10. Positioning ring; 11. Set screw; 12. Locking sleeve; 13. Retrieval head; 14. Release pin; 15. Unlocking block; 16. Locking ring seat; 17. Unlocking pin; 18. Locking ring; 19. Overload ring; 20. Overload pin; 21. Upper connector; 22. Rubber tube upper retaining ring; 23. Rubber tube seat; 24. Spacer ring; 25. Y-sealed rubber tube; 26. Outer central tube; 27. 28. Lower retaining ring of rubber tube; 29. ​​Emergency pin; 30. Upper cone; 31. Slip; 32. Slip seat; 33. Slip cap; 34. Lower cone; 35. Positioning lock block; 36. Unsealing head; 37. Unsealing limit pin; 38. Rubber tube sealing seat; 39. Expanding rubber tube; 40. Spring seat; 41. Spring seat; 42. Spring sealing seat; 43. Steel ball; 44. Ball seat; 45. Ball seat pin; 46. Lower connector; 47. Straightening head; 48. Anti-jamming pin; 49. Production insertion tube; 50. Vulcanizing ring; 51. Insertion tube guide cone. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1 like Figure 1-1 and Figure 1-2 As shown, this utility model provides a long-lasting, digging-and-retrieving mining tool, comprising an upper connector 1, a central tube 8, a piston cylinder 9, a rubber sleeve seat 23, an outer central tube 26, and a lower connector 46. The upper connector 1 is threaded both internally and externally. The upper connector 1 is connected to the central tube 8 via the internal thread and to the piston cylinder 9 via the external thread. The upper connector 1 is also equipped with a locking ring 2 for locking the piston cylinder 9. An inner piston 6 is mounted on the central tube 8, and an outer piston 4 is mounted on the inner piston 6. A split push sleeve 7 is threaded to the lower end of the outer piston 4, and a locking sleeve 12 is connected to the lower end of the split push sleeve 7. A positioning ring 10 is also fitted onto the central tube 8, positioned above the locking sleeve 12. The central tube 8 is connected to the outer central tube 26 as a single unit via a release pin 14. At the upper end of the outer central tube 26… A retrieval head 13 is provided; the retrieval head 13 is connected to a locking ring seat 16 via a release pin 17; the rubber tube seat 23 is sleeved on the outer central tube 26, and the lower end of the rubber tube seat 23 is provided with an upper cone 29, a slip 30 and a lower cone 33 in sequence, and the lower end of the lower cone 33 is connected to a release head 35; the release head 35 is connected to a rubber tube sealing seat 37 via a release limiting pin 36; the lower end of the rubber tube sealing seat 37 is connected to an expanding rubber tube 38, and the lower end of the expanding rubber tube 38 is connected to a spring seat 39; the lower connector 46 is threaded to the lower end of the outer central tube 26, and the lower end of the central tube 8 is provided with a ball seat 44.

[0022] This utility model is a long-lasting isolation mining tool that can be retrieved and drilled to remove core components without requiring major repairs.

[0023] Example 2 like Figure 1-1 and Figure 1-2 As shown, this utility model provides a long-lasting, digging-and-retrieving mining tool, which includes an upper connector 1, a central tube 8, a piston cylinder 9, a rubber sleeve seat 23, an outer central tube 26, and a lower connector 46. The upper connector 1 is threaded both internally and externally. The upper connector 1 is connected to the central tube 8 via the internal thread and to the piston cylinder 9 via the external thread. The upper connector 1 is also equipped with a locking ring 2 for locking the piston cylinder 9. An inner piston 6 is mounted on the central tube 8, and an outer piston 4 is mounted on the inner piston 6. A split push sleeve 7 is threaded to the lower end of the outer piston 4, and a locking sleeve 12 is connected to the lower end of the split push sleeve 7. A positioning ring 10 is also fitted onto the central tube 8, positioned above the locking sleeve 12. The central tube 8 is connected to the outer central tube 26 as a single unit via a release pin 14. A retrieval head 13 is provided at the upper end of the outer central tube 26. The retrieval head 13 is connected to a locking ring seat 16 via a release pin 17. A locking ring 18 is mounted on the locking ring seat 16, and the lower end of the locking ring 18... An overload ring 19 is provided on the outer central tube 26 at the end; the rubber sleeve seat 23 is sleeved on the outer central tube 26, and an upper connector 21, a rubber sleeve upper retaining ring 22, a spacer ring 24 and a Y-sealing rubber sleeve 25 are sequentially sleeved on the rubber sleeve seat 23 from top to bottom. The upper end of the upper connector 21 is connected to the lower end of the locking sleeve 12; an upper cone 29, a slip 30 and a lower cone 33 are sequentially provided on the lower end of the rubber sleeve seat 23, and a release head 35 is connected to the lower end of the lower cone 33; the release head 35 is connected to the rubber sleeve sealing seat 37 through a release limiting pin 36; an expansion rubber sleeve 38 is connected to the lower end of the rubber sleeve sealing seat 37, and a spring seat 39 is connected to the lower end of the expansion rubber sleeve 38; a lower connector 46 is threaded to the lower end of the outer central tube 26, and a ball seat 44 is provided on the lower end of the central tube 8.

[0024] Furthermore, such as Figure 2 As shown, the long-lasting, digging-capable, and sequesterable tool further includes an independent insertion tube, which includes a centering head 47, a production insertion tube 49, and an insertion tube guide cone 51. The centering head 47 is fixedly connected to the upper end of the production insertion tube 49 by an anti-jamming pin 48, and the lower end of the production insertion tube 49 is connected to the insertion tube guide cone 51 by a thread.

[0025] Furthermore, a vulcanizing ring 50 is provided on the lower end of the production tube 49.

[0026] Furthermore, a step is provided on the outer side of the lower end of the production tube 49 to limit the vulcanization ring 50. The vulcanization ring 50 is limited by the step of the production tube 49 and is further limited by the threaded tightening of the tube guide cone 51.

[0027] Furthermore, the spring seat 39 contains a spring 40 and a valve seat 41. The spring 40 is located on the valve seat 41, and a valve is provided inside the valve seat 41. The lower end of the spring seat 39 is connected to a valve sealing seat 42, which is used for sealing and limiting the valve seat 41.

[0028] Furthermore, the spring seat 39, spring 40, valve seat 41, and valve sealing seat 42 are all sequentially mounted on the outer center tube 26.

[0029] Furthermore, the upper end of the inner piston 6 is provided with a locking block 3, and the outer piston 4 and the locking block 3 lock the inner piston 6 onto the upper connector 1.

[0030] Furthermore, the locking ring 18 and the locking sleeve 12 are threadedly engaged with each other.

[0031] Furthermore, the overload ring 19 is fixed to the outer center tube 26 by the overload pin 20.

[0032] Furthermore, the lower end of the rubber sleeve seat 23 is threadedly connected to a rubber sleeve lower retaining ring 27.

[0033] Furthermore, a slip seat 31 for limiting the slip 30 is provided between the upper cone 29 and the lower cone 33. The upper cone 29 and the lower cone 33 support the slip 30 and are both limited within the slip seat 31.

[0034] Furthermore, a step is provided on the lower outer side of the upper connector 1, and the piston cylinder 9 is limited by the step at the lower end of the upper connector 1.

[0035] Preferably, the ring 2 is threaded onto the upper connector 1, located above the piston cylinder 9, for locking the piston cylinder 9.

[0036] Preferably, the outer piston 4 is mounted on the inner piston 6 and tightened with the starting pin 5.

[0037] Furthermore, preferably, the lower thread of the split push sleeve 7 is connected to the upper thread of the locking sleeve 12 and locked by the piston cylinder 9.

[0038] Furthermore, the positioning ring 10 is threaded onto the central tube 8 and tightened with the set screw 11.

[0039] Furthermore, the salvage head 13 is mounted on the upper end of the outer central tube 26, and is fixed to the outer central tube 26 by the unsealing block 15 and the unsealing pin 17. At the same time, the unsealing pin 17 also connects the locking ring seat 16 to the salvage head 13.

[0040] Preferably, the upper connector 21 and the locking sleeve 12 are threaded together.

[0041] Furthermore, the rubber sleeve seat 23 is fitted onto the outer central tube 26 and is limited by the overload ring 19.

[0042] Furthermore, the upper cone 29 is fixed to the rubber sleeve seat 23 by an emergency pin 28.

[0043] Furthermore, the slip cap 32 is threadedly connected to the slip seat 31 to limit the slip 30.

[0044] Furthermore, a positioning locking block 34 is fixedly connected to the outer central tube 26 and is located below the lower cone 33.

[0045] Preferably, the unsealing head 35 and the lower cone 33 are connected by threads.

[0046] Preferably, the rubber sleeve sealing seat 37 is fixed together with the unsealing head 35 by the unsealing limiting pin 36, and the rubber sleeve sealing seat 37 is located at the lower end of the unsealing head 35.

[0047] Furthermore, the expansion sleeve 38 is threadedly connected to the sleeve sealing seat 37 and both are mounted on the outer center tube 26.

[0048] Preferably, the spring seat 39 is threadedly connected to the expansion sleeve 38.

[0049] Furthermore, the ball seat 44 is fixed together with the center tube 8 by the ball seat pin 45.

[0050] Furthermore, the Y-sealing tube 25 end is designed with a protrusion-proof copper shoulder guard.

[0051] Furthermore, the upper retaining ring 22 and the spacer ring 24 of the rubber sleeve are both made of easily drillable composite material, while the lower retaining ring 27 of the rubber sleeve is made of ductile iron.

[0052] The easy-drilling composite material can be composed of 40-60 parts by weight of bisphenol A type epoxy resin, 40-60 parts by weight of phenolic resin and 1-3 parts by weight of curing agent.

[0053] Furthermore, the support mechanism composed of the upper cone 29, lower cone 33, slip 30, and slip seat 31, with the upper cone 29, slip 30, and slip seat 31 made of easily grindable cast iron, is easy to drill and remove without major repair risks. The slip 30 is inlaid with a matrix of tungsten carbide alloy teeth, which increases both the anchoring strength of the slip 30 and its applicability to incompletely cleaned casings. After the tool is set, it is placed in a relatively clean environment, making the slip 30 less prone to corrosion and damage, resulting in longer anchoring support and more reliable unsealing.

[0054] Furthermore, the shearing pressures of the starting pin 5, the release pin 14, and the ball seat pin 45 are different. The shearing pressure of the starting pin 5 is lower than that of the release pin 14, and the shearing pressure of the release pin 14 is lower than that of the ball seat pin 45. Before the starting pin 5 shears off, the expansion sleeve 38 is ensured to be set and sealed. Before the release pin 14 shears off, the slip 30 is ensured to be supported, anchored, and compressed for sealing. The ball seat pin 45 shears off, ensuring the tubing remains unobstructed.

[0055] The retrieval head 13 is equipped with two types of retrieval threads: internal and external. The lower retrieval spear grips the internal thread of the retrieval head 13. When the retrieval load is abnormal, a steel ball 43 can be thrown to press and release the retrieval spear. The lower retrieval cylinder grips the external thread of the retrieval head 13. When the retrieval load is abnormal, the tubing can be rotated forward to lock the limiting groove on the retrieval head 13 and the limiting pin designed on the locking sleeve 12. Continue rotating the tubing to exit the retrieval cylinder. If it is impossible to exit the retrieval cylinder, the load on the movable tubing can be increased to shear the overload pin 20, release the overload ring 19, and then shear the emergency pin 28 to bring out the retrieval head 13, locking sleeve 12, locking ring 18, locking ring seat 16, overload ring 19, upper connector 21, rubber sleeve seat 23, rubber sleeve upper retaining ring 22, Y-sealed rubber sleeve 25, spacer ring 24, rubber sleeve lower retaining ring 27, etc., to avoid complicating the construction conditions.

[0056] Furthermore, the straightening head 47 has a through groove milled on its side, which not only meets the guiding requirements but also has a certain flow prevention and anti-clogging capability. At the same time, the straightening head 47 and the retrieval head 13 contact to release force, preventing the central tube 8 from getting stuck due to the change in diameter. The lower end face of the insertion guide cone 51 is designed with a large chamfer to ensure smooth re-insertion and prevent the retrieval head 13 from being blocked and unable to be inserted into the outer central tube 26. Moreover, the insertion tube 49 is longer than the outer central tube 26 to ensure that the outer central tube 26 will not be blocked.

[0057] It should be noted that the long-lasting, digging-and-sealing tool of this utility model is equipped with sealing elements at the joints where sealing is required.

[0058] like Figure 3-1 and Figure 3-2 As shown, the present invention is connected to the oil pipe string and lowered into the predetermined position.

[0059] like Figure 4-1 and Figure 4-2 As shown, high-pressure liquid is pumped into the central tube 8. The high-pressure liquid passes through the bypass hole on the central tube 8 and the outer central tube 26. The high-pressure liquid pushes open the valve seat 41, compresses the spring 40, and expands the rubber sleeve 38 to the inner wall of the sleeve under the action of the high-pressure liquid, forming a seal with the sleeve. The sealing effect is better if the pressure is increased further. When the pressure is increased to the point where the pressure is released, the valve seat 41 instantly returns to its original position under the dual action of the spring 40 and the high-pressure liquid inside the expander rubber sleeve 38, forming a seal with the valve sealing seat 42, blocking the high-pressure liquid inside the expander rubber sleeve 38, and maintaining the sealing state with the sleeve.

[0060] like Figure 5-1 and Figure 5-2As shown, high-pressure liquid is pumped into the central tube 8, and the pressure is increased until the starting pin 5 inside the piston is sheared. The outer piston 4 moves downward and is limited by the split push sleeve 7. The upper locking block 3 is released. The inner piston 6, the split push sleeve 7, and the outer piston 4 are pushed downward by the high-pressure liquid. At the same time, the locking sleeve 12 and the upper connector 21 are also pushed downward. The upper connector 21 pushes the upper retaining ring 22 of the rubber tube, the Y-sealed rubber tube 25, the spacer ring 24, the lower retaining ring 27 of the rubber tube, the rubber tube seat 23, and the upper cone 29 to move downward as a whole. This also causes the slip seat 31 to move downward. After moving to the limit position, the slip 30 is supported by the upper cone 29 and the lower cone 33 and anchored to the sleeve.

[0061] like Figure 6-1 and Figure 6-2 As shown, with continued pressurization, the inner piston 6, the split push sleeve 7, and the outer piston 4 are pushed downwards by the high-pressure liquid, while simultaneously pushing the locking sleeve 12 and the upper connector 21 downwards. The upper connector 21 pushes the upper retaining ring 22 of the rubber tube to compress the Y-sealing rubber tube 25 radially, sealing the annular space with the sleeve. With continued pressurization, the slip 30 and the sleeve are more firmly anchored, and the Y-sealing rubber tube 25 is also compressed to its limit. At the same time, this state is also engaged by the unidirectionally moving locking ring 18 and locking sleeve 12, forming a self-locking state.

[0062] like Figure 7-1 and Figure 7-2 As shown, the pressure continues to increase to the release pressure, the release pin 14 is sheared off, and the locking ring 18 and locking sleeve 12 engage and self-lock, fixing the current state where the Y-sealing sleeve 25 is compressed and sealed and the slips 30 is supported by the upper cone 29 and lower cone 33. The locking ring seat 16 is limited and fixed to the outer center tube 26 by the release pin 17, the release block 15, and the retrieval head 13. The entire setting and sealing state is locked and left in the well for a long time. The pressure continues to increase and shears off the ball seat pin 45, and the steel ball 43 and ball seat 44 fall into the tailpipe. The setting process ends here.

[0063] like Figure 8-1 and Figure 8-2 The image shows the state of a long-term, retrievable, and drillable isolation production tool left in the well for an extended period.

[0064] like Figure 9-1 and Figure 9-2 As shown, the independent production insertion tube 49 is connected to the lower tailpipe of the pump and inserted back into the inner cavity of the outer central tube 26. The straightening head 47 and the insertion guide cone 51 work together to ensure that the production insertion tube 49 is smoothly inserted into the outer central tube 26. The sulfurized ring 50 straightens and protects the O-ring on the production insertion tube 49 from damage. When the tubing is lowered, the insertion straightening head 47 and the retrieval head 13 come into contact to relieve the pressure, and at this time, the production is in the isolated extraction state. The O-ring on the production insertion tube 49 and the inner wall of the outer central tube 26 form a seal, and the length of the production insertion tube 49 is slightly longer than that of the outer central tube 26, so the outer central tube 26 will not be blocked by scale. Each pump inspection operation only requires checking and replacing the vulnerable seals (O-rings) on the production insertion tube 49 and continuing the insertion for production.

[0065] like Figure 10-1 and 10-2 As shown, the tool for unsealing this utility model is a retrieval spear or retrieval cylinder. Grabbing the retrieval head 13, the unsealing pin 17 is broken, releasing the unsealing block 15. The locking ring seat 16 becomes indefinite and fails, the locking mechanism fails, the retrieval head 13 is lifted and hooks the upper limit step of the locking sleeve 12, causing the locking sleeve 12 and the upper connector 21 to move upward. The inner cavity step of the upper connector 21 causes the rubber sleeve seat 23 to move upward. The rubber sleeve seat 23 causes the upper cone 29 to move upward. The upper cone 29 causes the slip seat 31 to move upward. At this time, the slip retracts, and the Y-sealed rubber sleeve 25 is also released and rebounds. The tubing continues to be lifted, and the expanding rubber sleeve 38 shears the unsealing limit pin 36 due to friction with the sleeve seal. The rubber sleeve sealing seat 37, the expanding rubber sleeve 38, the spring seat 39, and the valve sealing seat 42 move downward as a whole to release pressure. The expanding rubber sleeve 38 contracts and rebounds, thus the unsealing is successful.

[0066] If the seal cannot be lifted smoothly, increase the active load to shear the overload pin 20, releasing the overload ring 19. Then, shear the emergency pin 28 and lift the tubing to bring out the retrieval head 13, locking sleeve 12, locking ring seat 16, locking ring 18, overload ring 19, upper connector 21, rubber tube upper retaining ring 22, rubber tube seat 23, spacer ring 24, Y-sealed rubber tube 25, rubber tube lower retaining ring 27, etc., simplifying the next construction step.

[0067] If the overload ring 19 cannot be released, the retrieval tool can be withdrawn, and a milling drill bit can be lowered to mill away the easily drillable upper retaining ring 22, spacer ring 24, Y-sealed rubber tube 25, and lower retaining ring 27 of the rubber tube, before proceeding with the retrieval. In short, everything is designed to eliminate the need for major repairs, simplify construction procedures, and reduce construction costs.

[0068] It should be noted that the above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent transformations or modifications made in accordance with the spirit and essence of the main technical solution of this utility model should be covered within the protection scope of this utility model.

[0069] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A long-lasting, digging-and-retrieving tool for isolated mining, characterized in that, It includes an upper connector, a central tube, a piston cylinder, a rubber sleeve seat, an outer central tube, and a lower connector; The upper connector is threaded both internally and externally. The upper connector is connected to the central tube via the internal thread and to the piston cylinder via the external thread. The upper connector is also equipped with a locking ring for locking the piston cylinder. An inner piston is mounted on the central tube, and an outer piston is mounted on the inner piston. A split push sleeve is threaded to the lower end of the outer piston, and a locking sleeve is connected to the lower end of the split push sleeve. A positioning ring is also fitted onto the central tube, and the positioning ring is located above the locking sleeve. The central tube is connected to the outer central tube as a whole via a release pin. A retrieval head is provided at the upper end of the outer central tube. The retrieval head is connected to a locking ring seat via a release pin. A rubber sleeve seat is fitted onto the outer central tube, and the lower connector is connected to the lower end of the outer central tube.

2. The long-lasting, digging-capable, and retrieval-capable mining tool according to claim 1, characterized in that, The locking ring seat is equipped with a locking ring, and an overload ring is provided on the outer central tube at the lower end of the locking ring. From top to bottom, an upper connector, a rubber tube upper retaining ring, a spacer ring, and a Y-sealing rubber tube are sequentially fitted onto the rubber tube seat. The upper end of the upper connector is connected to the lower end of the locking sleeve. At the lower end of the rubber tube seat, an upper cone, a slip, and a lower cone are sequentially arranged, and a release head is connected to the lower end of the lower cone. The release head is connected to a rubber tube sealing seat via a release limiting pin. An expanding rubber tube is connected to the lower end of the rubber tube sealing seat, and a spring seat is connected to the lower end of the expanding rubber tube. A ball seat is provided at the lower end of the central tube.

3. The long-lasting, digging-capable, and retrieval-capable mining tool according to claim 2, characterized in that, It also includes an independent cannula, which includes a straightening head, a production cannula, and a cannula guide cone; the straightening head is fixedly connected to the upper end of the production cannula by an anti-jamming pin, and the lower end of the production cannula is connected to the cannula guide cone by a thread.

4. The long-lasting, digging-capable, and retrieval-capable mining tool according to claim 3, characterized in that, A sulfide ring is provided on the lower end of the production tube.

5. A long-lasting, retrieval and drilling-capable mining tool according to claim 3, characterized in that, The spring seat contains a spring and a valve seat, and the lower end of the spring seat is connected to a valve sealing seat.

6. The long-lasting, digging-capable, and retrieval-capable mining tool according to claim 5, characterized in that, The spring seat, spring, valve seat, and valve sealing seat are all sequentially mounted on the outer center tube.

7. A long-lasting, retrieval and drilling-capable mining tool according to claim 2, characterized in that, The inner piston is provided with a locking block at its upper end, and the outer piston and the locking block lock the inner piston to the upper connector.

8. A long-lasting, retrieval and drilling-capable mining tool according to claim 2, characterized in that, The overload ring is fixed to the outer central tube by an overload pin.

9. A long-lasting, retrieval and drilling-capable mining tool according to claim 2, characterized in that, The lower end of the rubber sleeve seat is threadedly connected to a rubber sleeve lower retaining ring.

10. A long-lasting, retrieval and drilling-capable mining tool according to claim 2, characterized in that, A slip seat for limiting the slip is also provided between the upper cone and the lower cone.

Images