Composite type safe releasing device for tubular column

Abstract

The utility model relates to the technical field of oil development underground pipe columns, and discloses a pipe column composite type safe hand releasing device which comprises an upper connector arranged on a pipe column. The upper connector is detachably and sequentially connected with a righting mechanism, a fixed connecting mechanism, a composite hand releasing mechanism, a sealing mechanism and a sealing cylinder from top to bottom through threads, wherein the righting mechanism enables the device to be in a centering state when the device is put in and released to be recycled, the fixed connecting mechanism has high-strength bearing connecting capacity, and oil pipe buckles are arranged at the upper end of the upper connector and the lower end of the sealing cylinder. According to the composite type safe releasing device for the pipe column, various modes are provided for releasing of the pipe column under the complex well condition, the success rate of releasing of the pipe column is increased, and it is guaranteed that the pipe column can release of the hand emergently as soon as possible.

Description

Technical Field

[0001] This utility model relates to the field of downhole tubing technology in oil development, specifically to a composite safety release device for tubing. Background Technology

[0002] In oil and gas reservoir development, with the gradual depletion of easily recoverable oil and gas resources and the increasing global demand for oil and gas resources, drilling activities are increasingly shifting to high-risk and highly challenging environments such as complex geological areas, deep water, and extreme working conditions. Well conditions are becoming more complex, and there are situations where production tubing cannot be recovered after long-term operation. Usually, the tubing is equipped with a safety release device for emergency release. However, the current safety release device has a simple release structure, and in complex well conditions, it may not be able to release the tubing, requiring the tubing to be cut again, which further increases the extraction cost. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the aforementioned technologies by providing a composite safety release device for tubing strings. This device offers multiple methods for releasing tubing strings under complex well conditions, improves the success rate of tubing string release, and ensures that the tubing string can be released in an emergency as quickly as possible.

[0004] To achieve the above objectives, the present invention designs a tubular composite safety release device, which includes an upper connector on the tubular column. The upper connector is detachably connected from top to bottom by threads to a centering mechanism that keeps the device in a centered state during lowering and release and retraction, a fixing connection mechanism with high strength load-bearing capacity, a composite release mechanism, a sealing mechanism, and a sealing cylinder. Both the upper end of the upper connector and the lower end of the sealing cylinder are provided with oil pipe buckles.

[0005] Preferably, the straightening mechanism includes an upper straightening ring that abuts against the positioning boss of the upper connector via a thread, the upper straightening ring being fixed to the upper connector by a first set pin, and a lower straightening ring that abuts against the positioning boss of the sealing cylinder via a thread, the lower straightening ring being fixed to the sealing cylinder by a second set pin.

[0006] Preferably, the fixed connection mechanism includes an anchoring short section that abuts against the positioning boss of the upper connector via a thread. The anchoring short section is fixed to the upper connector by a third set pin. The other end of the anchoring short section abuts against the positioning boss of the sealing mandrel via a thread. The anchoring short section is fixed to the sealing mandrel by a fourth set pin. The lower end of the sealing mandrel abuts against the positioning boss of the guide shoe via a thread. A ratchet anchor claw is fitted on the anchoring short section. The ratchet anchor claw is connected to the sealing cylinder via an internal snap.

[0007] Preferably, a first O-ring is provided between the upper end of the anchoring short section and the positioning boss of the upper connector, and a second O-ring is provided between the lower end of the anchoring short section and the positioning boss of the sealing mandrel.

[0008] Preferably, the inner side of the ratchet anchor claw is designed with several evenly distributed grooves, the anchoring short section and the ratchet anchor claw are engaged by a convex and concave platform, the outer side of the ratchet anchor claw is provided with a left-hand spiral thread, and several cuts are provided with a 50t to 60t weak point at the upper part of the cuts, and it can be retracted inward.

[0009] Preferably, the composite release mechanism includes a piston located below the ratchet anchor claw. The lower end face of the piston abuts against the upper end face of the sealing mandrel. The outer circumference of the anchoring sub is provided with an O-ring sealing groove and a pin shearing groove. The inner side of the piston is provided with an O-ring sealing groove. A third O-ring is provided in the O-ring sealing groove of the anchoring sub, and a fourth O-ring is provided in the O-ring sealing groove of the piston. The anchoring sub and the piston are sealed by the third and fourth O-rings. The piston starting pin is connected to the piston and fixed to the pin shearing groove of the anchoring sub through several evenly distributed threaded holes on the piston. The anchoring sub is provided with a pressure transmission hole. The cavity formed between the piston and the anchoring sub is connected to one end of the pressure transmission hole, and the other end of the pressure transmission hole is connected to the interior of the tubing.

[0010] Preferably, the sealing mechanism includes a sealing assembly sleeved on the sealing mandrel. The sealing assembly includes a metal back ring, a polymer retaining ring, a rubber sealing ring, and a metal spacer. The metal back ring, polymer retaining ring, polymer back ring, rubber sealing ring, and metal spacer form a seal with the sealing mandrel and sealing cylinder using multiple sets of sealing forms at the top and bottom.

[0011] Compared with the prior art, this utility model has the following advantages: it provides multiple methods for unloading the tubing under complex well conditions, including rotation, lifting and external pressure, which improves the success rate of unloading the tubing and ensures that the tubing can be unloaded in an emergency as quickly as possible. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the tubular composite safety release device of this utility model;

[0013] Figure 2 for Figure 1 Schematic diagram of the structure of the middle ratchet anchor claw;

[0014] Figure 3 for Figure 1 Schematic diagram of the middle sealing assembly;

[0015] Figure 4 This is a schematic diagram of the rotating release mechanism of the tubular composite safety release device of this utility model;

[0016] Figure 5 This is a schematic diagram of the pressure release mechanism for the composite safety release device of the tubular column of this utility model;

[0017] Figure 6 This is a schematic diagram of the lifting and releasing mechanism of the composite safety release device for tubular columns of this utility model.

[0018] The components in the diagram are labeled as follows:

[0019] 1. Upper connector, 2. Upper centering ring, 3. First O-ring seal, 4. First set pin, 5. Third set pin, 6. Racket anchor claw, 7. Anchoring short section, 8. Piston starting pin, 9. Third O-ring seal, 10. Piston, 11. Fourth O-ring seal, 12. Sealing mandrel, 13. Fourth set pin, 14. Second O-ring seal, 15. Second set pin, 16. Lower centering ring, 17. Sealing assembly, 18. Sealing cylinder, 19. Guide shoe. Detailed Implementation

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

[0021] like Figures 1-3 As shown, a composite safety release device for a tubing column includes an upper connector 1 mounted on the tubing column. The upper connector 1 is detachably connected from top to bottom by threads to a centering mechanism that keeps the device centered during lowering and release / retraction, a fixed connection mechanism with high strength load-bearing capacity, a composite release mechanism, a sealing mechanism, and a sealing cylinder 18. Both the upper end of the upper connector 1 and the lower end of the sealing cylinder 18 are provided with oil pipe fasteners.

[0022] The straightening mechanism includes an upper straightening ring 2 that abuts against the positioning boss of the upper connector 1 via a thread. The upper straightening ring 2 is fixed to the upper connector 1 by a first set pin 4. It also includes a lower straightening ring 16 that abuts against the positioning boss of the sealing cylinder 18 via a thread. The lower straightening ring 16 is fixed to the sealing cylinder 18 by a second set pin 15. The straightening mechanism keeps the composite pipe safety release device in a centered state during lowering and release.

[0023] In addition, the fixed connection mechanism includes an anchoring short section 7 that abuts against the positioning boss of the upper connector 1 via a thread. The anchoring short section 7 is fixed to the upper connector by a third set pin 5. The other end of the anchoring short section 7 abuts against the positioning boss of the sealing mandrel 12 via a thread. The anchoring short section 7 is fixed to the sealing mandrel 12 by a fourth set pin 13. The lower end of the sealing mandrel 12 abuts against the positioning boss of the guide shoe 19 via a thread. A ratchet anchor 6 is sleeved on the anchoring short section 7. The ratchet anchor 6 is connected to the sealing cylinder 18 by an internal snap.

[0024] Among them, a first O-ring 3 is provided between the upper end of the anchoring short section 7 and the positioning boss of the upper connector 1, and a second O-ring 14 is provided between the lower end of the anchoring short section 7 and the positioning boss of the sealing mandrel 12.

[0025] Combination Figure 2 As shown, the inner side of the ratchet anchor 6 is designed with several evenly distributed grooves. The anchoring short section 7 and the ratchet anchor 6 are engaged by a convex and concave platform. The outer side of the ratchet anchor 6 is provided with a left-hand spiral thread, and several cuts are provided. A 50t to 60t weak point is provided at the upper part of the cut. In this embodiment, it is 60t and can be retracted inward.

[0026] In this embodiment, the composite release mechanism includes a piston 10 located below the ratchet anchor 6. The lower end face of the piston 10 abuts against the upper end face of the sealing mandrel 12. The outer circumference of the anchoring sub 7 is provided with an O-ring sealing groove and a pin shearing groove. The inner side of the piston 10 is provided with an O-ring sealing groove. The O-ring sealing groove of the anchoring sub 7 is provided with a third O-ring 9, and the O-ring sealing groove of the piston 10 is provided with a fourth O-ring 11. The anchoring sub 7 and the piston 10 are sealed by the third O-ring 9 and the fourth O-ring 11. The piston starting pin 8 is connected to the piston 10 through several evenly distributed threaded holes on the piston 10 and fixed to the pin shearing groove of the anchoring sub 7. The number of piston starting pins 8 can be increased or decreased according to construction needs to adjust the starting force value. The anchoring sub 7 is provided with a pressure transmission hole. The cavity formed between the piston 10 and the anchoring sub 7 is connected to one end of the pressure transmission hole, and the other end of the pressure transmission hole is connected to the interior of the tubing.

[0027] Combination Figure 3 As shown, the sealing mechanism includes a sealing assembly 17 sleeved on the sealing mandrel 12. The sealing assembly 17 includes a metal back ring 1701, a polymer retaining ring 1702, a polymer back ring 1703, a rubber sealing ring 1704, and a metal spacer 1705. The metal back ring 1701, the polymer retaining ring 1702, the polymer back ring 1703, the rubber sealing ring 1704, and the metal spacer 1705 form a seal with the sealing mandrel 12 and the sealing cylinder 18 by using multiple sets of sealing forms at the top and bottom.

[0028] In this embodiment, the metal back ring 1701 and the metal spacer ring 1705 are made of high-strength alloy steel, the polymer retaining ring 1702 and the polymer back ring 1703 are made of polytetrafluoroethylene material that can withstand high temperature and high pressure, and the rubber sealing ring 1704 is made of high-performance fluororubber material.

[0029] In this embodiment, the operation is described according to the sequence of operations, and is divided into two working states: entering the well and releasing the operator.

[0030] Well entry status: such as Figure 1 As shown, the sealing cylinder 18 at the lower end of the tubing-string composite safety release device is connected to the lower tubing, and the upper connector 1 at the upper end is connected to the upper tubing. The device is then gradually lowered into the target formation in the well. The tubing-string composite safety release device has excellent internal and external pressure differential sealing and high load-bearing capacity.

[0031] Released from hand: such as Figures 4-6 As shown, this tubing string composite safety release device has three operation release modes:

[0032] Operation release method one: such as Figure 4 As shown, lifting the tubing string puts it in a slightly stretched state. Rotating the tubing string 15-20 times clockwise causes the upper connector 1 and anchoring stub 7 to rotate the ratchet anchor pawl 6 clockwise and disengage from the sealing cylinder 18. Continuing to lift the tubing string further removes the upper connector 1, upper stabilizing ring 2, anchoring stub 7, piston 10, ratchet anchor pawl 6, sealing mandrel 12, sealing assembly 17, guide shoe 19, and the first O-ring 3, third O-ring 9, fourth O-ring 11, second O-ring 14, first locking pin 4, piston starting pin 8, and fourth locking pin 13 from the sealing cylinder 18, thus achieving release.

[0033] Operation release method two: such as Figure 5 As shown, by pressurizing the annulus of the oil jacket, when the pressure reaches the preset starting force value, the piston starting pin 8 is sheared, causing the piston 10 to move upward and the ratchet anchor 6 to lose support and retract inward. Continuing to lift the tubing string, the upper connector 1, upper straightening ring 2, anchoring short section 7, piston 10, ratchet anchor 6, sealing mandrel 12, sealing assembly 17, guide shoe 19, and the first O-ring seal 3, third O-ring seal 9, fourth O-ring seal 11, second O-ring seal 14, first locking pin 4, piston starting pin 8, and fourth locking pin 13 are pulled out from the sealing cylinder 18, thus achieving release.

[0034] Operation release method three: such as Figure 5As shown, the tubing is directly lifted until the lifting load exceeds 60t. The ratchet anchor claw 6 breaks off at its weak point. Continuing to lift the tubing will remove the upper connector 1, upper centering ring 2, anchoring short section 7, piston 10, sealing mandrel 12, sealing assembly 17, guide shoe 19, and the first O-ring 3, third O-ring 9, fourth O-ring 11, second O-ring 14, first locking pin 4, piston starting pin 8, and fourth locking pin 13 from the sealing cylinder 18, thus achieving release.

[0035] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this utility model is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this utility model are defined only by the scope of the claims.

[0036] The aspects disclosed in this specification and claims are merely examples, and therefore, this specification and claims are not limited to the details shown. In the foregoing description, detailed descriptions of relevant known functions or configurations have been omitted where it would unnecessarily obscure the focus of this specification and claims.

[0037] Finally, it should be noted that the above content is a further detailed description of the utility model in conjunction with specific embodiments. It should not be considered that the specific implementation of this utility model is limited to these descriptions. For those skilled in the art, any simple substitutions made without departing from the concept of this utility model should be considered within the protection scope of this utility model. The above embodiments are merely representative examples of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model should be considered within the protection scope of this utility model.

Claims

1. A composite safety release device for tubular columns, comprising an upper connector (1) disposed on the tubular column, characterized in that: The upper connector (1) is detachably connected from top to bottom by threads to a centering mechanism that keeps the device in a centered state when it is lowered and released for recycling, a fixed connection mechanism with high strength load-bearing capacity, a composite release mechanism, a sealing mechanism, and a sealing cylinder (18). Both the upper end of the upper connector (1) and the lower end of the sealing cylinder (18) are provided with oil pipe buckles.

2. The composite safety release device for tubular columns according to claim 1, characterized in that: The straightening mechanism includes an upper straightening ring (2) that abuts against the positioning boss of the upper connector (1) by means of a thread. The upper straightening ring (2) is fixed to the upper connector (1) by means of a first set pin (4). It also includes a lower straightening ring (16) that abuts against the positioning boss of the sealing cylinder (18) by means of a thread. The lower straightening ring (16) is fixed to the sealing cylinder (18) by means of a second set pin (15).

3. The composite safety release device for tubular columns according to claim 2, characterized in that: The fixed connection mechanism includes an anchoring short section (7) that abuts against the positioning boss of the upper connector (1) by a thread. The anchoring short section is fixed to the upper connector by a third set pin (5). The other end of the anchoring short section (7) abuts against the positioning boss of the sealing mandrel (12) by a thread. The anchoring short section (7) is fixed to the sealing mandrel (12) by a fourth set pin (13). The lower end of the sealing mandrel (12) abuts against the positioning boss of the guide shoe (19) by a thread. A ratchet anchor claw (6) is sleeved on the anchoring short section (7). The ratchet anchor claw (6) is connected to the sealing cylinder (18) by an internal snap.

4. The tubular composite safety release device according to claim 3, characterized in that: A first O-ring (3) is provided between the upper end of the anchoring short section (7) and the positioning boss of the upper connector (1), and a second O-ring (14) is provided between the lower end of the anchoring short section (7) and the positioning boss of the sealing mandrel (12).

5. The composite safety release device for tubular columns according to claim 3, characterized in that: The inner side of the ratchet anchor claw (6) is designed with several evenly distributed grooves. The anchoring short section (7) and the ratchet anchor claw (6) are engaged by a convex and concave platform. The outer side of the ratchet anchor claw (6) is provided with a left-hand spiral thread, and several cuts are provided with a 50t to 60t weak point at the upper part of the cuts, which can be retracted inward.

6. The composite safety release device for tubular columns according to claim 3, characterized in that: The composite release mechanism includes a piston (10) located below the ratchet anchor (6). The lower end face of the piston (10) abuts against the upper end face of the sealing mandrel (12). The outer circumference of the anchoring sub (7) is provided with an O-ring sealing groove and a pin shearing groove. The inner side of the piston (10) is provided with an O-ring sealing groove. The O-ring sealing groove of the anchoring sub (7) is provided with a third O-ring seal (9). The O-ring sealing groove of the piston (10) is provided with a fourth O-ring seal (11). (7) A seal is formed between the piston (10) and the piston (10) by the third O-ring (9) and the fourth O-ring (11). The piston starting pin (8) is connected to the piston (10) through several evenly distributed threaded holes on the piston (10) and fixed to the pin shear groove of the anchoring short section (7). The anchoring short section (7) is provided with a pressure transmission hole. The cavity formed between the piston (10) and the anchoring short section (7) is connected to one end of the pressure transmission hole, and the other end of the pressure transmission hole is connected to the inside of the tubing.

7. The composite safety release device for tubular columns according to claim 3, characterized in that: The sealing mechanism includes a sealing assembly (17) sleeved on the sealing mandrel (12). The sealing assembly (17) includes a metal back ring (1701), a polymer retaining ring (1702), a polymer back ring (1703), a rubber sealing ring (1704), and a metal spacer (1705). The metal back ring (1701), the polymer retaining ring (1702), the polymer back ring (1703), the rubber sealing ring (1704), and the metal spacer (1705) form a seal with the sealing mandrel (12) and the sealing cylinder (18) by using multiple sets of sealing forms at the top and bottom.

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