A large-diameter recyclable bridge plug

Abstract

A large-diameter retrievable bridge plug relates to the field of oil and gas production equipment technology, including a retrieval and release assembly, a locking and releasing assembly, an anchoring assembly, a sealing assembly, and a central tube. The locking and releasing assembly includes a release sleeve, a locking ring, a pull sleeve, a conversion joint, a connecting sleeve, a retrieval diameter, a break-off ring, a release sleeve, and a release pin. The locking ring is located outside the central tube, with ratchet A on its inner side and ratchet B on the outer side of the central tube below the locking ring. The downward ratchet A and ratchet B engage to limit the upward movement of the locking ring. The pull sleeve is located below the locking ring and above the rubber sleeve assembly. The setting rebound force cannot push the locking ring upward, making the setting very reliable. The locking and releasing assembly also includes a release shovel, a fixing post, and an unlocking pin. The lower inner side of the locking ring has a conical surface A, and the upper end of the release shovel has a conical surface B. The pull sleeve and the release sleeve are connected by the unlocking pin. The upper sidewall of the pull sleeve has an elongated hole, through which the fixing post passes to connect the release shovel and the release sleeve.

Description

Technical Field

[0001] This invention belongs to the technical field of oil and gas production equipment, and particularly relates to a large-diameter retrievable bridge plug. Background Technology

[0002] Oil and gas production is the process of extracting oil and natural gas from underground reservoirs, encompassing exploration, drilling, logging, and production. Each stage of oil and gas production requires different types of uphole and downhole equipment. Bridge plugs are downhole tools used in various well operations in oilfields, such as water shut-off, testing, cementing, and fracturing. For example, in testing operations requiring specific inter-layer data, the testing tool needs to be lowered to a designated location downhole. The outer diameter of the testing tool is limited in design, thus requiring a tool that can anchor and seal the entire testing setup. Conventional Y211 packers with single-direction slips can only provide unidirectional anchoring; therefore, bridge plugs are chosen. Bridge plugs can specifically seal water and oil in the formation, controlling the seepage of water and oil from the formation.

[0003] After existing hollow bridge plugs are set, the rebound force is stabilized by the unlocking pin. Unexpected unsealing frequently occurs due to quality issues with the unlocking pin, downhole pressure fluctuations, or other problems, directly leading to operational failure. Furthermore, most existing hollow bridge plugs are for single use only and cannot be reused. Summary of the Invention

[0004] This invention provides a large-diameter recyclable bridge plug, which can be used in oilfield operations such as water shut-off and testing. First, this invention is a hollow bridge plug. Structurally, the cone angles of the upper and lower cones of the anchoring assembly are designed to be smaller, resulting in a smaller overall thickness of the anchoring assembly. Therefore, the diameter of the central tube can be larger than that of ordinary hollow bridge plugs, allowing it to pass through conventional testing tools. Second, the rebound force of the setting seal is completely stabilized by the locking ring. The locking ring and the outer side of the central tube are reliably engaged by ratchet teeth, resulting in very high setting reliability and preventing accidental unsealing during use. Finally, this invention cuts off three pins during the setting process and one pin during unsealing. After unsealing, only four pins need to be replaced. It is reusable after recycling, and no disassembly of components is required during reuse.

[0005] The technical solution provided by this invention is: a large-diameter retrievable bridge plug, comprising a retrieval and release assembly, a locking and releasing assembly, an anchoring assembly, a sealing assembly, and a central tube; the retrieval and release assembly includes a delivery tool and a retrieval tool; the anchoring assembly and the sealing assembly are located on the lower outer side of the central tube; the upper part of the sealing assembly is threadedly connected to a conversion sleeve; the locking and releasing assembly includes a release sleeve, a locking ring, a pull sleeve, a conversion connector, a connecting sleeve, a retrieval diameter, a break ring, a release sleeve, and a release pin; the release sleeve is located above the conversion sleeve and abuts against it; when the release sleeve is pulled upwards, the conversion sleeve does not follow; an annular space is left between the release sleeve and the central tube; a non-closed circumferential locking ring is movably disposed in the upper part of the annular space; the locking ring... The inner side has ratchet A, and the outer side of the central tube below the locking ring has ratchet B. After the downward ratchet A and ratchet B engage, the upward movement of the locking ring is limited. The pulling sleeve is located below the locking ring. The upper end of the pulling sleeve can abut against the locking ring, and the lower end of the pulling sleeve is threadedly connected to the conversion sleeve. This ensures that the rebound force of the setting seal only acts on the locking ring. The locking ring and the central tube are reliably engaged by the ratchet. The rebound force of the setting seal cannot push the locking ring upward, and the setting seal is very reliable. The upper end of the locking ring can abut against the conversion joint. The release sleeve, conversion joint, connecting sleeve, and recovery diameter are threadedly connected from bottom to top. The release sleeve is threadedly connected to the upper end of the central tube, the break ring is threadedly connected to the upper end of the release sleeve, and the release pin is set between the conversion joint and the release sleeve.

[0006] During setting, the large-diameter retrievable bridge plug and the delivery tool are lowered into the well together. After reaching the predetermined position, the delivery tool is pressurized, and the piston pushes the pusher of the delivery tool. The pusher pushes the retrievable diameter of the large-diameter retrievable bridge plug downwards, and the connecting sleeve and conversion joint move downwards, shearing off the release pin. The conversion joint simultaneously pushes the unsealing sleeve and locking ring downwards. Driven by the fixed column, the unsealing shovel moves downwards, and the unsealing sleeve pushes the conversion sleeve and pulling sleeve downwards. When the conversion sleeve moves downwards, the bushing moves downwards together. At this time, the rubber sleeve pushes the lower outer sleeve downwards. First, the lower outer sleeve pushes the slip assembly downwards to anchor the slips. Then, the upper cone pushes the rubber sleeve to deform it, setting the rubber sleeve. The locking ring locks in the center tube to prevent the rubber sleeve from rebounding. Pressurization continues. When the preset tonnage is reached, the breakage ring is broken, the tool is released, and the setting of the large-diameter retrievable bridge plug is completed.

[0007] The locking and unlocking assembly also includes an unlocking shovel, a fixing post, and an unlocking pin. The lower inner side of the locking ring has a conical surface A. The unlocking shovel is located inside the pulling sleeve. The upper outer side of the unlocking shovel has a conical surface B that mates with the conical surface A. The pulling sleeve and the unlocking sleeve are connected by an unlocking pin. The upper side wall of the pulling sleeve has a through vertical elongated hole. The fixing post passes through the elongated hole to connect the unlocking shovel and the unlocking sleeve. In the initial state, the fixing post is located at the lower part of the elongated hole.

[0008] During unsealing, the retrieval tool is lowered. Once the retrieval tool reaches the designated position, it engages with the external ratchet of the recovery path. The retrieval tool is then lifted, causing the recovery path to move the connecting sleeve, adapter, and unsealing sleeve upwards. The unlocking pin is sheared off. As the tool continues to be lifted, the unsealing sleeve, through the fixed post, drives the unsealing shovel to lift the locking ring. The tool continues to be lifted, causing the pulling sleeve, adapter sleeve, and bushing to move upwards. Finally, the rubber sleeve recovery slip is reset, and the large-diameter retrievable bridge plug is unsealed.

[0009] A further technical solution is as follows: The anchoring assembly is fitted onto the outer side of the lower part of the central tube. The anchoring assembly includes an upper cone, a slip assembly, and a lower cone. The lower cone is threaded onto the central tube, and the slip assembly is located between the upper and lower cones. The upper cone slides with the central tube. The sealing assembly includes a rubber sleeve, a bushing, an upper retaining ring, and a lower retaining ring. The rubber sleeve is fitted onto the outer side of the bushing, and the bushing is slidably positioned on the outer side of the central tube. Both ends of the rubber sleeve are held by the upper and lower retaining rings. The lower retaining ring is threadedly connected to a lower outer sleeve, which is threadedly connected to the upper cone of the anchoring assembly. The upper retaining ring is threadedly connected to a conversion sleeve, which is also threadedly connected to the bushing. When an external force pushes the conversion sleeve downwards, the conversion sleeve and the bushing move downwards together. At this time, the rubber sleeve pushes the lower outer sleeve downwards. First, the lower outer sleeve pushes the slip assembly downwards to anchor the slip. Then, the upper cone pushes the rubber sleeve to deform and set the rubber sleeve. The lower end of the bushing is threadedly connected to a bushing cap, and a sequence pin is provided between the bushing cap and the upper cone.

[0010] A further technical solution is that a fastening pin is provided between the upper cone and the slip assembly, and the shear strength of the fastening pin is less than that of the sequential pin.

[0011] A further technical solution is: the break-off ring has a break-off diameter in the middle, the tensile strength of the break-off diameter is greater than the shear strength of the sequential pin, and the tensile strength of the break-off diameter is also greater than the setting pressure of the large-diameter recyclable bridge plug.

[0012] A further technical solution is to have ratchet C on the outside of the recovery path.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. In conventional bridge plugs, the setting and rebound force is stabilized by the unlocking pin. If the unlocking pin is sheared off due to material, size, or other issues, the bridge plug may accidentally unseal. In contrast, the rebound force after setting in this invention acts only on the locking ring, which is securely engaged with the central tube, preventing accidental unsealment and ensuring highly reliable setting.

[0015] 2. The pry-off unlocking method of this invention only requires breaking the unlocking pin when prying. Since the unlocking pin does not bear the rebound force of the seal, the shear strength of the unlocking pin can be designed to be very small, making unlocking very easy and preventing unlocking failure.

[0016] 3. The shovel design of the unsealing mechanism of the present invention is different from the conventional structure. After being lifted out, the new release pin, unlocking pin, sequence pin and fastening pin can be reinstalled and reused. The economic value of reusing the bridge plug is very high. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention before sealing.

[0018] Figure 2 This is a schematic diagram of the overall structure of the present invention after sealing.

[0019] Figure 3 yes Figure 1 Enlarged view of section I in the middle.

[0020] Figure 4 yes Figure 1 Enlarged view of section II in the middle.

[0021] Figure 5 yes Figure 1 Enlarged view of section III.

[0022] Figure 6 yes Figure 1 Enlarged view of section IV.

[0023] In the diagram: 1. Recovery diameter; 2. Break ring; 3. Release sleeve; 4. Connecting sleeve; 5. Adaptor; 6. Release pin; 7. Unsealing sleeve; 8. Locking ring; 9. Unsealing shovel; 10. Fixing post; 11. Unlocking pin; 12. Pulling sleeve; 13. Adaptor sleeve; 14. Upper retaining ring; 15. Bushing; 16. Side rubber tube; 17. Middle rubber tube; 18. Lower retaining ring; 19. Lower outer sleeve; 20. Sequential pin; 21. Bushing cap; 22. Upper cone; 23. Slip sleeve; 24. Fastening pin; 25. Slip; 26. Return spring; 27. Lower cone; 28. Central tube. Detailed Implementation

[0024] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0025] This invention includes a recovery and release assembly, a locking and unlocking assembly, an anchoring assembly, a sealing assembly, and a center. The recovery and release assembly includes a delivery tool and a retrieval tool. The anchoring assembly is fitted onto the outer side of the lower part of the central tube 28. The anchoring assembly includes an upper cone 22, a slip assembly, and a lower cone 27. The lower cone 27 is connected to the central tube 28. The slip assembly includes a slip sleeve 23, which is fitted onto the outer side of the upper cone 22 and the lower cone 27. Four slips 25 are placed inside the slip sleeve 23 and positioned at the slip 25 window. Four return springs 26 are placed in the inner groove of the slip 25. The upper cone 22 and the lower cone 27 respectively mate with the conical surface of the slip 25. Compared with existing bridge plugs, the cone angle design of the upper cone 22 and the lower cone 27 of this invention is smaller, so that the size of the slip assembly in the diameter direction of the central tube 28 (the overall thickness of the slip assembly) is smaller. Consequently, the diameter of the central tube 28 is larger than that of ordinary hollow bridge plugs. The maximum inner diameter of the central tube 28 of ordinary bridge plugs is Ø55mm, while the inner diameter of the central tube 28 of this invention is Ø65mm, which can pass through conventional testing tools.

[0026] After the upper cone 22 and the slip sleeve 23 are installed, they are connected by fastening pins 24. The upper end of the upper cone 22 is threaded to the lower outer sleeve 19. The bushing 15 and the bushing cap 21 are connected and inserted between the central tube 28 and the lower outer sleeve 19. The bushing cap 21 is connected to the lower outer sleeve 19 by sequential pins 20. The upper end of the lower outer sleeve 19 is threaded to the lower retaining ring 18. The lower side of the lower retaining ring 18 abuts against the bushing 15. The sealing rubber sleeve is fitted outside the bushing 15. The bushing 15 is located outside the central tube 28. The upper retaining ring 14 and the lower retaining ring 18 clamp the rubber sleeve. The upper retaining ring 14 is threaded to the external thread of the conversion sleeve 13. The bushing 15 is threaded to... The internal thread of the conversion sleeve 13 causes the conversion sleeve 13 to move downwards, pushing the upper retaining ring 14, bushing 15, side rubber tube 16, middle rubber tube 17, lower retaining ring 18, lower outer sleeve 19, and upper cone 22. The upper cone 22 pushes the slip 25 downwards. Under the action of the lower cone 27, the fastening pin 24 is sheared, and the slip 25 extends out of the slip sleeve 23. When the slip 25 anchors the tube wall and continues to move downwards, the bushing 15 pushes the bushing cap 21 to shear the sequential pin 20. The bushing 15 continues to move downwards. Under the action of the slip 25, the upper cone 22 and lower outer sleeve 19 are fixed, and the rubber tube begins to compress, finally achieving the anchoring of the slip 25 and the expansion sealing of the rubber tube.

[0027] The main innovation of this invention is that the locking and unlocking assembly includes an unlocking sleeve 7, a locking ring 8, a pulling sleeve 12, a conversion joint 5, a connecting sleeve 4, a recovery diameter 1, a break ring 2, a release sleeve 3, and a release pin 6. The unlocking sleeve 7 is located above the conversion sleeve 13 and abuts against it. When the unlocking sleeve 7 is pulled upward, the conversion sleeve 13 does not follow. An annular space is left between the unlocking sleeve 7 and the central tube 28. The circumferentially non-closed locking ring 8 is movably disposed in the upper part of the annular space. The inner side of the locking ring 8 has ratchet A, and the outer side of the central tube 28 below the locking ring 8 has ratchet B. When the locking ring 8 moves downward, ratchet A and ratchet B engage, limiting the upward movement of the locking ring 8 after engagement. The pull sleeve 12 is located below the locking ring 8. The upper end of the pull sleeve 12 can abut against the locking ring 8, and the lower end of the pull sleeve 12 is threadedly connected to the conversion sleeve 13. This ensures that the setting force of the seal acts only on the locking ring 8. After the locking ring 8 and the center tube 28 are reliably engaged by ratchet teeth, the setting force of the seal cannot push the locking ring 8 upward, making the setting very reliable. Compared with the ordinary bridge plug, where the setting force of the seal is stabilized by the unlocking pin 11, the setting stability of this invention is outstanding. The upper end of the locking ring 8 can abut against the conversion joint 5. The release sleeve 7, conversion joint 5, connecting sleeve 4, and recovery diameter 1 are threadedly connected from bottom to top. The release sleeve 3 is threadedly connected to the upper end of the center tube 28, the break ring 2 is threadedly connected to the upper end of the release sleeve 3, and the release pin 6 is located between the conversion joint 5 and the release sleeve 3.

[0028] During setting, the break-off ring 2 of the large-diameter retrievable bridge plug is connected to the delivery tool (not shown in the attached diagram) and lowered into the well. After reaching the predetermined position, the delivery tool is pressurized, and the piston (not shown in the attached diagram) pushes the pusher of the delivery tool (not shown in the attached diagram). The pusher pushes the recovery diameter 1 of the large-diameter retrievable bridge plug downwards, the connecting sleeve 4 and the conversion joint 5 downwards, shearing off the release pin 6. The conversion joint 5 simultaneously pushes the release sleeve 7 and the locking ring 8 downwards. Driven by the fixed column 10, the release shovel 9 moves downwards. The release sleeve 7 pushes the conversion sleeve 13 and the pulling sleeve 12 downwards, simultaneously pushing the upper retaining ring 14, the bushing 15, the side rubber sleeve 16, the middle rubber sleeve 17, the lower retaining ring 18, and the lower outer... Sleeve 19 and upper cone 22 push slip 25 downward. Under the action of lower cone 27, fastening pin 24 is sheared, slip 25 extends out of slip sleeve 23, slip 25 is anchored, bushing 15 continues to descend, bushing 15 pushes bushing cap 21, shearing sequential pin 20, bushing 15 continues to descend, under the action of slip 25, upper cone 22 and lower outer sleeve 19 are fixed, and the rubber tube begins to compress. When the rubber tube is compressed to the appropriate position, locking ring 8 locks in the central tube 28 to prevent the rubber tube from springing back. Pressurization continues. When the preset tonnage is reached, the break ring 2 is broken at the middle break diameter, the tool is released, and the large-diameter retrievable bridge plug setting is completed.

[0029] The delivery tool described is not a structure claimed by this invention. However, it should be noted that the delivery tool should be a hydraulic tool. The hydraulic pressure inside the delivery tool pushes the pressure piston of the delivery tool to move downward. The pressure piston pushes the push cylinder of the delivery tool. The push cylinder pushes the recovery diameter 1 of this invention to move downward. The above is the general working process of the delivery tool.

[0030] The locking and unlocking assembly also includes an unlocking spatula 9, a fixing post 10, and an unlocking pin 11. The lower inner side of the locking ring 8 has a conical surface A. The unlocking spatula 9 is located inside the pulling sleeve 12. The upper outer side of the unlocking spatula 9 has a conical surface B that mates with the conical surface A. The conical surface B of the unlocking spatula 9 can extend into the conical surface A, thereby prying the locking ring 8 off the central tube 28. The pulling sleeve 12 and the unlocking sleeve 7 are connected by the unlocking pin 11. The upper side wall of the pulling sleeve 12 has a through vertical elongated hole. The fixing post 10 passes through the elongated hole to connect the unlocking spatula 9 and the unlocking sleeve 7. In the initial state, the fixing post 10 is located at the lower part of the elongated hole.

[0031] The external of the recovery path 1 has ratchet C. During unsealing, a retrieval tool (not shown in the attached diagram) is lowered. After the retrieval tool reaches the designated position, it engages with the external ratchet of the recovery path 1. The retrieval tool is then lifted, causing the recovery path 1 to move the connecting sleeve 4, the conversion connector 5, and the unsealing sleeve 7 upwards. The unlocking pin 11 is cut off. The unsealing sleeve 7 continues to lift, and the unsealing sleeve 7, through the fixing post 10, drives the unsealing shovel 9 to pry up the locking ring 8 (the fixing post 10 is positioned from the lower part of the long hole to the upper part of the long hole). The unsealing sleeve 12, the conversion sleeve 13, and the bushing 15 continue to move upwards, and finally the rubber sleeve recovery slip 25 is reset, and the large-diameter recyclable bridge plug is unsealed.

[0032] The present invention provides a pry-off unlocking method. When prying, it is only necessary to break the unlocking pin 11. Since the unlocking pin 11 does not bear the spring force of the seat, the shear strength of the unlocking pin 11 can be designed to be very small, making unlocking very easy and preventing unlocking failure.

[0033] The shovel design of the unsealing mechanism of the present invention is different from the conventional structure. After being lifted out, the new release pin 6, unlocking pin 11, sequence pin 20 and fastening pin 24 can be reinstalled and reused.

[0034] The retrieval tool described is not a structure claimed by this invention. However, it should be noted that the retrieval tool must be able to engage with the ratchet of the recovery diameter 1 in order to achieve the lifting and unsealing of the large-diameter retrievable bridge plug.

[0035] The shear strength of the fastening pin 24 is less than that of the sequential pin 20; therefore, the anchoring component anchors first and the sealing component seals later, so that it will not continue to slide passively downward after the rubber tube is expanded and sealed, thus minimizing the risk of scratching the rubber tube.

[0036] The pull-off ring 2 has a pull-off diameter in the middle (not shown in the figure). The tensile strength of the pull-off diameter is greater than the shear strength of the sequential pin 20. The tensile strength of the pull-off diameter is also greater than the setting pressure of the large-diameter recyclable bridge plug, ensuring that the pull-off ring 2 is only pulled off after the present invention is truly set.

[0037] The outer part of the recovery diameter 1 has ratchet C.

[0038] It should be noted that the ratchet A, ratchet B, and ratchet C in this invention are numbered only for easy distinction, and there are no corresponding drawing numbers in this solution.

[0039] In summary, this invention provides a large-diameter retrievable bridge plug that can be used in oilfield projects such as water shut-off and testing. Firstly, this invention is a hollow bridge plug. Structurally, there is no need for a setting piston between the central tube 28 and the outer shell. Furthermore, the cone angles of the upper cone 22 and lower cone 27 of the anchoring assembly are small, and the overall thickness of the anchoring assembly is relatively small. This provides space for increasing the diameter of the central tube 28, making the diameter of the central channel of this invention larger than that of ordinary hollow bridge plugs, allowing it to pass through conventional testing tools. Secondly, this invention utilizes a locking and unlocking mechanism that differs from conventional structures. The rebound force of the setting is completely stabilized by the locking ring 8. The locking ring 8 and the outer side of the central tube 28 are securely engaged by ratchet teeth, resulting in very high reliability of the setting and preventing accidental unlocking during use. Simultaneously, the unlocking pin 11 can be a pin with very low shear force, significantly improving the success rate of unlocking. Finally, during the sealing process, three pins are cut off, and during unsealing, one pin is cut off. After unsealing, all four pins need to be reinstalled. No disassembly is required during the process, so the device can be reused after recycling.

Claims

1. A large-diameter recyclable bridge plug, comprising a recycling and release assembly, a locking and releasing assembly, an anchoring assembly, a sealing assembly, and a central tube (28); wherein the anchoring assembly and the sealing assembly are located on the lower outer side of the central tube (28), and the upper part of the sealing assembly is threadedly connected to a conversion sleeve (13); characterized in that: The locking and unlocking assembly includes an unlocking sleeve (7), a locking ring (8), a pulling sleeve (12), a conversion joint (5), a connecting sleeve (4), a recovery diameter (1), a break ring (2), a release sleeve (3), and a release pin (6). The unlocking sleeve (7) is located above the conversion sleeve (13) and abuts against the conversion sleeve (13). The locking ring (8) is movably disposed between the unlocking sleeve (7) and the central tube (28). The inner side of the locking ring (8) has a ratchet A, and the outer side of the central tube (28) below the locking ring (8) has a ratchet B. After the ratchet A and ratchet B mesh, they limit the upward movement of the locking ring (8). The pulling sleeve (12) is located below the locking ring (8). The upper end of the pulling sleeve (12) abuts against the locking ring (8), and the lower end of the pulling sleeve (12) is threadedly connected to the conversion sleeve (13). The upper end of the locking ring (8) is the conversion joint (5). The unlocking sleeve (7), the conversion joint (8), the lock ring (8), the pull sleeve (12), the conversion joint (12), the lock ring (8), the pull sleeve (12), the conversion joint (13), the lock ring (8), the pull sleeve (12), the lock ring (8), the pull sleeve (12), the conversion joint (13), the lock ring (8), the lock ring (8), the pull sleeve (12 ... The connector (5), connecting sleeve (4) and recovery diameter (1) are connected by threads from bottom to top. The release sleeve (3) and pull ring (2) are connected by threads to the upper end of the central tube (28). The release pin (6) is set between the conversion connector (5) and the release sleeve (3). The locking and unlocking assembly also includes a sealing shovel (9), a fixing post (10) and an unlocking pin (11). The lower inner side of the locking ring (8) has a conical surface A. The sealing shovel (9) is set inside the pulling sleeve (12). The upper outer side of the sealing shovel (9) has a conical surface B that matches the conical surface A. The upper side wall of the pulling sleeve (12) has a through vertical long hole. The fixing post (10) passes through the long hole to connect the sealing shovel (9) and the sealing sleeve (7). In the initial state, the fixing post (10) is located at the lower part of the long hole. The pulling sleeve (12) and the sealing sleeve (7) are connected by the unlocking pin (11). When unsealing, the recovery path (1) drives the connecting sleeve (4), the conversion joint (5), and the unsealing sleeve (7) to move upward. The unlocking pin (11) is cut off. Continue to lift upward. The unsealing sleeve (7) drives the unsealing shovel (9) to pry up the locking ring (8) through the fixed column (10). The relative position of the fixed column (10) moves from the lower part of the long hole to the upper part of the long hole. Continue to lift upward to drive the pulling sleeve (12), the conversion sleeve (13), and the bushing (15) to move upward. Finally, the rubber tube recovery slip (25) is reset. The anchoring assembly is fitted onto the outer side of the lower part of the central tube (28). The anchoring assembly includes an upper cone (22), a slip assembly, and a lower cone (27). The lower cone (27) is threaded onto the central tube (28), and the slip assembly is located between the upper cone (22) and the lower cone (27). The upper cone (22) is slidably fitted onto the central tube (28). The sealing assembly includes a rubber sleeve, a bushing (15), an upper retaining ring (14), and a lower retaining ring (18). The rubber sleeve is fitted onto the outer side of the bushing (15), and the bushing (15) is slidably positioned on the outer side of the central tube (28). Outside the central tube (28), the two ends of the rubber tube are clamped by an upper retaining ring (14) and a lower retaining ring (18). The lower retaining ring (18) is threadedly connected to a lower outer sleeve (19). The lower outer sleeve (19) is threadedly connected to the upper cone (22) of the anchoring assembly. The upper retaining ring (14) is threadedly connected to a conversion sleeve (13). The conversion sleeve (13) is also threadedly connected to the bushing (15). The lower end of the bushing (15) is threadedly connected to a bushing cap (21). A sequence pin (20) is provided between the bushing cap (21) and the upper cone (22). A fastening pin (24) is provided between the upper cone (22) and the slip assembly. The shear strength of the fastening pin (24) is less than that of the sequential pin (20). The anchoring assembly anchors first, and the sealing assembly seals later. It will not continue to slide passively downward after the rubber sleeve is expanded and sealed. After removal, the large-diameter reusable bridge plug is reused by reinstalling the new release pin (6), unlocking pin (11), sequence pin (20) and fastening pin (24).

2. The large-diameter recyclable bridge plug according to claim 1, characterized in that: The middle part of the break ring (2) has a break diameter, and the tensile strength of the break diameter is greater than the shear strength of the sequential pin (20).

3. The large-diameter recyclable bridge plug according to claim 1, characterized in that: The recovery path (1) has ratchet C on the outside.

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