A long-lasting intubation bridge plug that can be quickly drilled and retrieved

Abstract

The present invention discloses a long-lasting pipe bridge plug capable of being quickly drilled, comprising an upper joint, the outer surface of the upper joint being provided with an outer sleeve, the inner surface of the outer sleeve being provided with an outer piston, the inner surface of the outer piston being provided with an anti-blocking locking block, the inner surface of the outer piston being provided with an inner piston, the inner surface of the inner piston being provided with an inner center tube, and the outer surface of the inner piston being provided with a petal push sleeve. Through the above structure, the expansion rubber cylinder adopts a skeleton-free metal rubber integrally vulcanized, and relying on its sufficient thickness and elasticity, it can automatically compensate and fill the obvious roughness and undulations of the inner wall of the casing, and has stronger adaptability to corrosion and scaling of the inner wall of the casing. The cone and the slip are in contact with the Mohs self-locking cone angle, and the slip is a carrier of a high-speed drilling composite material and is inlaid with carbide teeth, and its drilling, grinding and sleeve milling efficiency is very high.

Description

Technical Field

[0001] The invention relates to the technical field of oil well mining equipment, in particular to a long-lasting pipe-insertion bridge plug that can be retrieved and drilled quickly. Background Art

[0002] Currently, the most common solution in oilfields is to use a built-in isolation packer in the production string to isolate the production or to temporarily seal the well with a conventional pipe bridge plug before running the production string. Under harsh wellbore conditions, these issues present the following drawbacks: conventional pipe bridge plugs are left in the well for extended periods; scale and adhesion between the slips and the cone can cause stuck fishing, which can easily lead to downhole accidents. Even if a conventional pipe bridge plug is successfully retrieved, many accessories remain in the well, making milling and un-jamming extremely labor-intensive and difficult. When using drillable bridge plugs, the plugs cannot be retrieved and must be milled, which is also very labor-intensive. Conventional drillable bridge plugs are made of ductile iron, which is slightly less difficult to drill and mill than conventional alloy steel. Milling and un-jamming remain significant challenges in highly deviated and horizontal wells. For wellbore surfaces with heavy corrosion and scaling, compression seals offer poor sealing and a short shelf life, while expansion seals have metal sheaths at both ends, making drilling and milling difficult once stuck. Summary of the Invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a long-lasting intubation bridge plug that can be quickly drilled. The expansion rubber sleeve adopts a skeleton-free metal rubber that is integrally vulcanized. Relying on its sufficient thickness and elasticity, it can automatically compensate and fill the obvious roughness and undulations on the inner wall of the casing, and has stronger adaptability to corrosion and scaling of the inner wall of the casing. The cone and the slip are in Mohs self-locking cone angle contact. The slip is a carrier of a fast-drilling composite material and is inlaid with carbide teeth. Its drilling, grinding and milling efficiency is very high.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a long-term intubation bridge plug capable of being retrieved and drilled quickly, comprising:

[0005] An upper joint, wherein the outer surface of the upper joint is provided with an outer sleeve, the inner surface of the outer sleeve is provided with an outer piston, the inner surface of the outer piston is provided with an anti-blocking lock block, the inner surface of the outer piston is provided with an inner piston, the inner surface of the inner piston is provided with an inner center tube, and the outer surface of the inner piston is provided with a petal push sleeve;

[0006] The outer surface of the outer center tube is provided with a slip, the outer surface of the slip is provided with a fishing head, the outer surface of the slip is provided with a locking sleeve, the inner surface of the fishing head is provided with a locking block, the outer surface of the outer center tube is provided with a locking ring seat, the right side of the locking ring seat is provided with an overload ring, the outer surface of the outer center tube and the right side of the overload ring is provided with a rubber cylinder seat, the outer surface of the rubber cylinder seat is fixedly connected to a compression rubber cylinder, and the outer surface of the rubber cylinder seat is provided with a cone;

[0007] The outer surface of the outer center tube is provided with a cava, the right surface of the cava is provided with a positioning sleeve, the right surface of the positioning sleeve is provided with an expansion sleeve, the upper surface of the outer center tube is provided with an expansion rubber cylinder, the inner surface of the outer center tube is provided with a single flow ring, the inner surface of the single flow ring is provided with a ball seat sleeve, the left surface of the ball seat sleeve is provided with a sealing ring, the inner surface of the ball seat sleeve is provided with a ball seat, the outer surface of the outer center tube is provided with a rubber cylinder seat, the outer surface of the outer center tube is provided with an expansion unsealing ring, the outer surface of the outer center tube is provided with a locking ring, the right surface of the locking ring is provided with a locking block, and the outer surface of the outer center tube is provided with a lower joint.

[0008] According to a first aspect of the present invention, a long-term pipe bridge plug capable of being retrieved and drilled quickly is provided, wherein a ring is provided on the left surface of the outer sleeve, and the left surface of the inner piston contacts an anti-blocking locking block.

[0009] According to a first aspect of the present invention, a long-lasting pipe bridge plug capable of being retrieved and drilled quickly is provided, wherein a locking ring is provided on the inner surface of the locking sleeve.

[0010] According to a first aspect of the present invention, a long-lasting pipe bridge plug capable of being quickly drilled is provided. The number of the compressed rubber tubes is multiple and distributed at intervals. Spacer rings are provided between the compressed rubber tubes and the spacer rings are fixedly connected to the rubber tube seat.

[0011] According to a first aspect of the present invention, a long-lasting pipe bridge plug capable of being retrieved and drilled quickly is provided, wherein a locking ring is provided on the inner surface of the positioning sleeve.

[0012] According to a first aspect of the present invention, a long-lasting pipe bridge plug capable of being quickly drilled and retrieved is provided, wherein an upper retaining ring is provided on the outer surface of the rubber cartridge seat, and a lower cap is provided on the left surface of the upper retaining ring.

[0013] According to a first aspect of the present invention, a long-lasting pipe bridge plug capable of being retrieved and drilled quickly is provided, wherein the outer surface of the lower cap contacts the locking sleeve.

[0014] Beneficial effects: The present invention can be used for rapid drilling and long-term intubation bridge plugs. The expansion rubber sleeve adopts the integral vulcanization of metal rubber without skeleton. Relying on its sufficient thickness and elasticity, it can automatically compensate and fill the obvious roughness and undulations on the inner wall of the casing, and has stronger adaptability to corrosion and scaling of the inner wall of the casing. The cone and the slip are in contact with the Mohs self-locking cone angle. The slip is a carrier of rapid drilling composite material and is inlaid with carbide teeth. Its drilling, grinding and milling efficiency is very high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0016] Figure 1 This is a diagram showing the internal structure of a long-lasting intubation bridge plug capable of being quickly drilled and retrieved according to the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of the structure at center A;

[0018] Figure 3 for Figure 1 A magnified schematic diagram of the structure at point B in the middle;

[0019] Figure 4 for Figure 1 A magnified schematic diagram of the structure at point C in the middle;

[0020] Figure 5 for Figure 1 A magnified schematic diagram of the structure at D in the middle;

[0021] Figure 6 for Figure 1 A magnified schematic diagram of the structure at E in the middle;

[0022] Figure 7 for Figure 1 A magnified schematic diagram of the structure at F in the middle;

[0023] Figure 8 for Figure 1 Enlarged schematic diagram of the structure at G in the middle.

[0024] Legend:

[0025] 1. Upper joint; 2. Combination ring; 3. Outer sleeve; 4. Anti-blocking locking block; 5. Outer piston; 6. Inner piston; 7. Split push sleeve; 8. Inner center tube; 9. Locking sleeve; 10. Fishing head; 11. Locking block; 12. Locking ring seat; 13. Locking ring; 14. Overload ring; 15. Lower combination cap; 16. Upper retaining ring; 17. Spacer ring; 18. Cylinder seat; 19. Compression rubber cylinder; 20. Cone; 21. Slip; 22. Sealing ring; 23. Ball seat sleeve; 24. Ball seat; 25. Locking ring; 26. Locking block; 27. Positioning sleeve; 28. Expansion sleeve; 29. Expansion rubber cylinder; 30. Single flow ring; 31. Expansion release ring; 32. Outer center tube; 33. Lower joint. DETAILED DESCRIPTION

[0026] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0027] Reference Figure 1-8The embodiment of the present invention is a long-lasting pipe bridge plug that can be quickly drilled and retrieved, which includes an upper joint 1, the outer surface of the upper joint 1 is provided with an outer sleeve 3, the left surface of the outer sleeve 3 is provided with a parallel ring 2, the left surface of the inner piston 6 is in contact with the anti-blocking lock block 4, the inner surface of the outer sleeve 3 is provided with an outer piston 5, the inner surface of the outer piston 5 is provided with an anti-blocking lock block 4, the inner surface of the outer piston 5 is provided with an inner piston 6, the inner surface of the inner piston 6 is provided with an inner center tube 8, and the outer surface of the inner piston 6 is provided with a petal push sleeve 7.

[0028] The outer surface of the outer center tube 32 is provided with a slip 21, and the outer surface of the slip 21 is provided with a fishing head 10. The fishing head 10 can release the unblocking block 11 when it moves upward. The outer surface of the slip 21 is provided with a locking sleeve 9, and the inner surface of the locking sleeve 9 is provided with a locking ring 13. The inner surface of the fishing head 10 is provided with a locking block 11. The unblocking block 11 can expand radially. The outer surface of the outer center tube 32 is provided with a locking ring seat 12, and an overload ring 14 is provided on the right side of the lock ring seat 12. A rubber cylinder seat 18 is provided on the outer surface of the outer center tube 32 and on the right side of the overload ring 14. A compression rubber cylinder 19 is fixedly connected to the outer surface of the rubber cylinder seat 18. There are multiple compression rubber cylinders 19 and they are distributed at intervals. Spacer rings 17 are provided between the compression rubber cylinders 19. The spacer rings 17 are fixedly connected to the rubber cylinder seat 18. The rubber cylinder seat 18 can abut against the overload ring 14 upward. The outer surface of the rubber cylinder seat 18 is provided with a cone 20.

[0029] The outer surface of the outer center tube 32 is provided with a slip 21, the right surface of the slip 21 is provided with a positioning sleeve 27, the inner surface of the positioning sleeve 27 is provided with a locking ring 25, the right surface of the positioning sleeve 27 is provided with an expansion sleeve 28, the upper surface of the outer center tube 32 is provided with an expansion rubber cylinder 29, the inner surface of the outer center tube 32 is provided with a single flow ring 30, the inner surface of the single flow ring 30 is provided with a ball seat sleeve 23, the left surface of the ball seat sleeve 23 is provided with a sealing ring 22, the inner surface of the ball seat sleeve 23 is provided with a sealing ring 22, and the inner surface of the ball seat sleeve 23 is provided with a sealing ring 22. A ball seat 24 is provided, a rubber cartridge seat 18 is provided on the outer surface of the outer center tube 32, an upper retaining ring 16 is provided on the outer surface of the rubber cartridge seat 18, a lower cap 15 is provided on the left surface of the upper retaining ring 16, and the outer surface of the lower cap 15 contacts the locking sleeve 9, an expansion and unsealing ring 31 is provided on the outer surface of the outer center tube 32, a locking ring 25 is provided on the outer surface of the outer center tube 32, a locking block 26 is provided on the right surface of the locking ring 25, and a lower joint 33 is provided on the outer surface of the outer center tube 32.

[0030] Working principle: Anti-blocking when going down the well: when going down the well, the petal push sleeve 7 is threadedly connected with the inner piston 6 and is limited to the upper joint 1 by the anti-blocking lock block 4. The outer piston 5 limits the expansion of the anti-blocking lock block 4, thereby locking the petal push sleeve 7, the inner piston 6 and the upper joint 1 into one. Only after the outer piston 5 starts to move downward and releases the anti-blocking lock block 4, the inner piston 6 and the petal push sleeve 7 can be separated from the upper joint 1 and the bridge plug can be started. The mechanical obstruction outside the bridge plug cannot start the bridge plug; the inner thread of the lower end of the petal push sleeve 7 is connected to the lock sleeve 9, and the petal push sleeve 7 is radially limited by the outer cylinder and cannot expand. The petal push sleeve 7 and the lock sleeve 9 cannot be disconnected, preventing the bridge plug from accidentally starting; hydraulic sealing: the ball is thrown to seal the ball seat 24, the oil pipe is pressurized, the inner center pipe 8 is under pressure, and the high pressure drives the outer piston 5 The shear pins are started by shearing, and the outer piston 5 moves downward to release the anti-blocking lock block 4. The anti-blocking lock block 4 expands radially to release the inner piston 6. The outer piston 5, the inner piston 6, and the petal push sleeve 7 move downward synchronously to push the locking sleeve 9 downward. Under the internal high pressure, the locking sleeve 9 moves downward in turn to push the upper retaining ring 16, the rubber cylinder set, the spacer ring 17, the rubber cylinder seat 18, and the cone downward. The slips 21 are stretched open to bite the casing to form a support anchor. When the anchor support ends and the rubber cylinder seat 18 no longer moves downward, the outer piston 5, the inner piston 6, and the petal push sleeve 7 continue to push the locking sleeve 9, the upper retaining ring 16, the rubber cylinder set, and the spacer ring 17 downward. The rubber cylinder is compressed and expanded to fit the casing to seal the upper and lower sections of the bridge plug casing, and can withstand a certain pressure. When the internal pressure rises to a certain value, the shear pins are released. After the shearing is cut, the inner center tube 8 is separated from the outer center tube 32, and the outer part of the petal push sleeve 7 loses the restriction of the outer shell 3 and can expand radially. The threaded connection between the petal push sleeve 7 and the locking sleeve 9 fails, and the upper joint 1, the outer piston 5, the inner piston 6, the petal push sleeve 7, and the inner center tube 8 can be raised from the wellbore; continue to increase the pressure to cut the pressure relief shear nails, the ball seat 24 is lost, the inner center tube 8 is depressurized, and the sealing is completed; because the locking sleeve 9 and the locking ring 13 are engaged through the one-way thread, the downward stroke of the locking sleeve 9 when the sealing is completed is locked. Even if the sealing hydraulic force disappears, the compression state of the rubber sleeve set and the anchoring state of the slip 21 are maintained. At the same time as the upper compression sealing mechanism is sealed, the high pressure of the center tube is also transmitted to the inner cavity of the expansion rubber sleeve 29 through the one-way ring, driving the expansion rubber sleeve 2 9 expands and fits the casing to form a seal. After the pressure in the central tube is relieved, the one-way ring prevents the high pressure in the inner cavity of the expansion rubber sleeve 29 from escaping to the central tube, so that the expansion rubber sleeve 29 is continuously sealed under the internal high pressure. The two sets of sealing mechanisms function relatively independently. Even if one of the sealing mechanisms fails, the tool as a whole is still sealed. The whole is salvaged: the salvage tool is lowered to capture the salvage head 10, the pipe string is lifted to cut the unsealing shear nails, the salvage head 10 moves upward to release the unblocking block 11, the unblocking block 11 expands radially, and the axial limit of the lock ring seat 12 is released. The salvage head 10 drives the locking sleeve 9, lock ring 13, lock ring seat 12, and rubber sleeve seat 18 upward until the rubber sleeve seat 18 abuts against the overload ring 14 upward, and the rubber sleeve set spacer ring 17, cone, slips 21 and other accessories are radially and axially reset;At the same time, the shear pins of the expansion unsealing ring 31 below the expansion rubber cylinder 29 are cut off, the expansion rubber cylinder 29 moves downward, and the high pressure in the inner cavity is relieved to the casing through the pressure relief groove outside the central tube, and the internal pressure of the expansion rubber cylinder 29 is relieved and recovered. The bridge plug is unsealed as a whole and can be completely lifted out of the wellbore for overload salvage: the salvage tool is lowered to capture the salvage head 10, and the tubing is lifted up to cut the unsealing shear pins. The salvage head 10 moves upward to release the unblocking block 11, which expands radially, and the axial limit of the lock ring seat 12 is released. The salvage head 10 drives the locking sleeve 9, the locking ring 13, the locking ring seat 12, and the rubber cylinder seat 18 upward until the rubber cylinder seat 18 presses against the overload ring 14 upward. When the slips 21 cannot be unanchored for some reason, the rubber cylinder seat 18 forcibly cuts the overload shear pins upward, and the overload ring 14 can be detached from the outer central tube 32. The salvage head 10, the locking sleeve 9, and the lock ring 13. The lock ring seat 12, overload ring 14, and rubber sleeve seat 18 are fished out of the wellbore, while the rubber sleeve set, spacer ring 17, cone, outer center pipe 32, slips 21, and lower sub 33 are left in the wellbore for unstuck hollow milling. Because the wellbore retaining tools are primarily made of high-speed drilling composite materials and rubber, the milling unstuck efficiency is very high. Milling unstuck: When drilling and unstuck are required after overload fishing, a hollow milling tool can be lowered. The composite material and rubber-based compression seal mechanism and support anchor mechanism are efficiently milled to unstuck the bridge plug itself, allowing subsequent milling or fishing to proceed directly, significantly reducing the workload of the well repair.

[0031] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the scope of the present invention.

Claims

1. A long-lasting pipe-inserted bridge plug capable of being quickly drilled and retrieved, characterized in that: It comprises an upper joint (1) and an outer center tube (32), wherein the outer surface of the upper joint (1) is provided with an outer sleeve (3), the inner surface of the outer sleeve (3) is provided with an outer piston (5), the inner surface of the outer piston (5) is provided with an anti-blocking lock block (4), the inner surface of the outer piston (5) is provided with an inner piston (6), the inner surface of the inner piston (6) is provided with an inner center tube (8), and the outer surface of the inner piston (6) is provided with a petal push sleeve (7); The outer surface of the outer center tube (32) is provided with a slip (21), the outer surface of the slip (21) is provided with a salvage head (10), the outer surface of the slip (21) is provided with a locking sleeve (9), the inner surface of the salvage head (10) is provided with a locking block (11), the outer surface of the outer center tube (32) is provided with a locking ring seat (12), the right side of the locking ring seat (12) is provided with an overload ring (14), the outer surface of the outer center tube (32) and located on the right side of the overload ring (14) is provided with a rubber cylinder seat (18), the outer surface of the rubber cylinder seat (18) is fixedly connected with a compression rubber cylinder (19), and the outer surface of the rubber cylinder seat (18) is provided with a cone (20); The right surface of the slip (21) is provided with a positioning sleeve (27), the right surface of the positioning sleeve (27) is provided with an expansion sleeve (28), the upper surface of the outer center tube (32) is provided with an expansion rubber cylinder (29), the inner surface of the outer center tube (32) is provided with a single flow ring (30), the inner surface of the single flow ring (30) is provided with a ball seat sleeve (23), the left surface of the ball seat sleeve (23) is provided with a sealing ring (22), the inner surface of the ball seat sleeve (23) is provided with a ball seat (24), the outer center tube (32) is provided with a plurality of sealing rings (22), and the inner surface of the ball seat sleeve (23) is provided with a plurality of sealing rings (22). The outer surface of the outer center tube (32) is provided with a rubber cylinder seat (18), the outer surface of the outer center tube (32) is provided with an expansion and unsealing ring (31), the outer surface of the outer center tube (32) is provided with a locking ring (25), the right surface of the locking ring (25) is provided with a locking block (26), and the outer surface of the outer center tube (32) is provided with a lower joint (33); the left surface of the outer sleeve (3) is provided with a parallel ring (2), the left surface of the inner piston (6) is in contact with the anti-blocking locking block (4); the inner surface of the locking sleeve (9) is provided with a locking ring (13).

2. The long-lasting pipe-inserted bridge plug capable of rapid drilling according to claim 1 is characterized in that: The number of the compression rubber cylinders (19) is multiple and spaced apart. Spacer rings (17) are provided between the compression rubber cylinders (19). The spacer rings (17) are fixedly connected to the rubber cylinder seat (18).

3. The long-lasting pipe-inserted bridge plug capable of being quickly drilled and retrieved according to claim 1, characterized in that: A locking ring (25) is provided on the inner surface of the positioning sleeve (27).

4. The long-lasting pipe-inserted bridge plug capable of being quickly drilled and retrieved according to claim 1, characterized in that: An upper retaining ring (16) is provided on the outer surface of the rubber cylinder seat (18), and a lower cap (15) is provided on the left surface of the upper retaining ring (16).

5. The long-lasting pipe-inserted bridge plug capable of being quickly drilled and retrieved according to claim 4 is characterized in that: The outer surface of the lower cap (15) is in contact with the locking sleeve (9).

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