Composite type safe releasing device for tubular column

Abstract

The invention 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 pipe column composite type safe hand releasing device, multiple modes are provided for pipe column hand releasing under the complex well condition, the success rate of pipe column hand releasing is increased, and it is guaranteed that the pipe column can conduct emergency hand releasing at the fastest speed.

Description

Technical Field

[0001] The invention relates to the technical field of downhole pipe strings in petroleum development, and in particular to a composite safety release device for a pipe string. Background Art

[0002] In the development of oil and gas reservoirs, with the gradual reduction of easily recoverable oil and gas resources and the gradual increase in the global economic demand for oil and gas resources, drilling activities are constantly shifting to high-risk and extremely challenging environments such as complex geological areas, deep water, and extreme working conditions. The well conditions are also more complicated. There is a situation where the production tubing cannot be recovered in a long-term exploitation. Usually, the tubing will be equipped with a safety release device for emergency release of the tubing. However, the current safety release device has a single release structure, and there is a situation where it cannot be released under complex well conditions, and the tubing needs to be cut again, which further increases the mining cost. Summary of the invention

[0003] The purpose of the present invention is to provide a composite safety release device for a pipe string in view of the deficiencies of the above-mentioned technology, which provides multiple ways for releasing the pipe string under complex well conditions, improves the success rate of releasing the pipe string, and ensures that the pipe string can be released in an emergency as quickly as possible.

[0004] To achieve the above-mentioned purpose, the composite safety release device for a tubing column designed in the present invention comprises an upper joint arranged on the tubing column, wherein the upper joint is detachably connected from top to bottom through threads to a straightening mechanism for keeping the device in a centered state when it is lowered and released and recovered, a fixed connection mechanism with high-strength load-bearing connection capacity, a composite release mechanism, a sealing mechanism and a sealing cylinder, and an oil pipe buckle is provided at the upper end of the upper joint and the lower end of the sealing cylinder.

[0005] Preferably, the straightening mechanism includes an upper straightening ring abutting against the positioning boss of the upper joint through a thread, and the upper straightening ring is fixed to the upper joint through a first fixing pin, and also includes a lower straightening ring abutting against the positioning boss of the sealing tube through a thread, and the lower straightening ring is fixed to the sealing tube through a second fixing pin.

[0006] Preferably, the fixed connection mechanism includes an anchoring short section that is abutted against the positioning boss of the upper joint through a thread, the anchoring short section is fixed to the upper joint through a third fixing pin, the other end of the anchoring short section is abutted against the positioning boss of the sealing core shaft through a thread, the anchoring short section is fixed to the sealing core shaft through a fourth fixing pin, the lower end of the sealing core shaft is abutted against the positioning boss of the guide shoe through a thread, and a ratchet anchor claw is sleeved on the anchoring short section, and the ratchet anchor claw is connected to the sealing cylinder through an inner buckle.

[0007] Preferably, a first O-ring is provided between the upper end of the anchoring pup joint and the positioning boss of the upper joint, and a second O-ring is provided between the lower end of the anchoring pup joint and the positioning boss of the sealing core shaft.

[0008] Preferably, a plurality of evenly distributed grooves are designed on the inner side of the ratchet anchor claw, the anchoring short section is embedded and matched with the ratchet anchor claw through convex and concave platforms, a left-handed thread buckle is arranged on the outer side of the ratchet anchor claw, and a plurality of incisions are arranged, and a 50t to 60t weak point is arranged at the upper part of the incision, and it can be retracted inwardly.

[0009] Preferably, the composite release mechanism includes a piston arranged below the ratchet anchor claw, the lower end face of the piston abuts against the upper end face of the sealing core shaft, the outer circumference of the anchoring short section 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 short section, a fourth O-ring is provided in the O-ring sealing groove of the piston, a seal is formed between the anchoring short section and the piston through the third O-ring and the fourth O-ring, a piston starting pin is connected to the piston through several threaded holes evenly distributed on the piston and fixed to the pin shearing groove of the anchoring short section, a pressure transmission hole is provided in the anchoring short section, the cavity formed between the piston and the anchoring short section 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 pipe column.

[0010] Preferably, the sealing mechanism includes a sealing assembly sleeved on the sealing core shaft, the sealing assembly includes a metal back ring, a polymer retaining ring, a polymer back ring, a rubber sealing ring and a metal spacer ring, and the metal back ring, polymer retaining ring, polymer back ring, rubber sealing ring and metal spacer ring adopt upper and lower multiple groups of sealing forms to form a seal with the sealing core shaft and the sealing cylinder.

[0011] Preferably, the metal back ring and the metal spacer ring are made of high-strength alloy steel material, the polymer retaining ring and the polymer back ring are made of polytetrafluoroethylene material that can withstand high temperature and high pressure, and the rubber sealing ring is made of high-performance fluororubber material.

[0012] Compared with the prior art, the present invention has the following advantages: it provides multiple ways for releasing the pipe string under complex well conditions, including rotation, lifting and pressurizing outside the pipe, thereby improving the success rate of releasing the pipe string and ensuring that the pipe string can be released in an emergency as quickly as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the pipe column composite safety release device of the present invention;

[0014] Figure 2 for Figure 1 Schematic diagram of the structure of the middle ratchet anchor claw;

[0015] Figure 3 for Figure 1 A schematic diagram of the structure of the sealing assembly;

[0016] Figure 4 It is a schematic diagram of the rotating release of the composite safety release device for a pipe column of the present invention;

[0017] Figure 5 It is a schematic diagram of the pressure release of the composite safety release device for the pipe column of the present invention;

[0018] Figure 6 It is a schematic diagram of the lifting and releasing of the composite safety releasing device for pipe column of the present invention.

[0019] The components in the figure are numbered as follows:

[0020] Upper joint 1, upper righting ring 2, first O-ring 3, first fixing pin 4, third fixing pin 5, ratchet anchor claw 6, anchoring short section 7, piston starting pin 8, third O-ring 9, piston 10, fourth O-ring 11, sealing mandrel 12, fourth fixing pin 13, second O-ring 14, second fixing pin 15, lower righting ring 16, sealing assembly 17, sealing cylinder 18, guide shoe 19. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of invention protection.

[0022] like Figure 1 to Figure 3 As shown, a composite safety release device for a tubular column comprises an upper joint 1 arranged on the tubular column, the upper joint 1 being detachably connected from top to bottom through threads with a straightening mechanism for keeping the device in a centered state when it is lowered and released and recovered, a fixed connection mechanism with high-strength load-bearing connection capacity, a composite release mechanism, a sealing mechanism and a sealing cylinder 18, and an oil pipe buckle is provided at the upper end of the upper joint 1 and the lower end of the sealing cylinder 18.

[0023] Among them, the righting mechanism includes an upper righting ring 2 which is abutted against the positioning boss of the upper joint 1 through a thread, and the upper righting ring 2 is fixed to the upper joint 1 through a first fixing pin 4. It also includes a lower righting ring 16 which is abutted against the positioning boss of the sealing tube 18 through a thread, and the lower righting ring 16 is fixed to the sealing tube 18 through a second fixing pin 15. The composite pipe column safety release device is kept in a centered state during lowering and release recovery through the righting mechanism.

[0024] In addition, the fixed connection mechanism includes an anchoring pup section 7 which is abutted against the positioning boss of the upper joint 1 through a thread, the anchoring pup section 7 is fixed to the upper joint through a third fixing pin 5, the other end of the anchoring pup section 7 is abutted against the positioning boss of the sealing core shaft 12 through a thread, the anchoring pup section 7 is fixed to the sealing core shaft 12 through a fourth fixing pin 13, the lower end of the sealing core shaft 12 is abutted against the positioning boss of the guide shoe 19 through a thread, and a ratchet anchor claw 6 is sleeved on the anchoring pup section 7, and the ratchet anchor claw 6 is connected to the sealing tube 18 through an inner buckle.

[0025] A first O-ring 3 is provided between the upper end of the anchoring pup joint 7 and the positioning boss of the upper joint 1 , and a second O-ring 14 is provided between the lower end of the anchoring pup joint 7 and the positioning boss of the sealing core shaft 12 .

[0026] Combination Figure 2 As shown, a plurality of evenly distributed grooves are designed on the inner side of the ratchet anchor claw 6, and the anchor short section 7 is embedded and matched with the ratchet anchor claw 6 through the convex and concave platforms. A left-handed thread buckle is arranged on the outer side of the ratchet anchor claw 6, and a plurality of incisions are arranged at the same time, and a 50t to 60t weak point is arranged at the upper part of the incision, and the weak point in this embodiment is 60t, and it can be retracted inwardly.

[0027] In this embodiment, the composite release mechanism includes a piston 10 arranged below the ratchet anchor claw 6, the lower end face of the piston 10 is in conflict with the upper end face of the sealing core shaft 12, an O-ring sealing groove and a pin shearing groove are arranged on the outer circumference of the anchoring short section 7, an O-ring sealing groove is arranged on the inner side of the piston 10, a third O-ring 9 is arranged in the O-ring sealing groove of the anchoring short section 7, a fourth O-ring 11 is arranged in the O-ring sealing groove of the piston 10, a seal is formed between the anchoring short section 7 and the piston 10 through the third O-ring 9 and the fourth O-ring 11, a piston starting pin 8 is connected to the piston 10 through several threaded holes evenly distributed on the piston 10 and fixed to the pin shearing groove of the anchoring short section 7, the piston starting pin 8 can adjust the starting force value by increasing or decreasing the number according to construction needs, a pressure transmission hole is arranged in the anchoring short section 7, a 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 pipe column.

[0028] Combination Figure 3 As shown, the sealing mechanism includes a sealing assembly 17 sleeved on the sealing core shaft 12, and the sealing assembly 17 includes a metal backing ring 1701, a polymer backing ring 1702, a polymer backing ring 1703, a rubber sealing ring 1704 and a metal spacer ring 1705. The metal backing ring 1701, the polymer backing ring 1702, the polymer backing ring 1703, the rubber sealing ring 1704 and the metal spacer ring 1705 adopt multiple sealing groups at the top and bottom to form a seal with the sealing core shaft 12 and the sealing cylinder 18.

[0029] In this embodiment, the metal back ring 1701 and the metal spacer ring 1705 are made of high-strength alloy steel material, the polymer retaining ring 1702 and the polymer back ring 1703 are made of polytetrafluoroethylene material that can withstand high temperature and pressure, and the rubber sealing ring 1704 is made of high-performance fluororubber material.

[0030] When this embodiment is used, it is described according to the working sequence, which is divided into two working states: entering the well and releasing the hands:

[0031] Well entry status: Figure 1 As shown, the sealing tube 18 at the lower end of the composite safety release device for the tubing string is connected to the lower oil pipe, and the upper joint 1 at the upper end is connected to the upper oil pipe, and is gradually lowered to the target layer in the well. The composite safety release device for the tubing string has excellent internal and external pressure differential sealing and high load-bearing performance.

[0032] Release state: Figures 4 to 6 As shown in the figure, the composite safety release device of the pipe string has three operation release modes:

[0033] Operation method 1: Figure 4 As shown, the pipe string is lifted up so that the pipe string is in a slightly pulled-up state, and the pipe string is rotated forwardly for 15 to 20 circles. The pipe string is connected to the upper joint 1, the anchoring short section 7 drives the ratchet anchor claw 6 to rotate forwardly to release and rotate out of the sealing cylinder 18, and the pipe string is continuously lifted up to remove the upper joint 1, the upper straightening ring 2, the anchoring short section 7, the piston 10, the ratchet anchor claw 6, the sealing mandrel 12, the sealing assembly 17, the guide shoe 19 and the first O-ring 3, the third O-ring 9, the fourth O-ring 11, the second O-ring 14, the first fixing pin 4, the piston starting pin 8, and the fourth fixing pin 13 from the sealing cylinder 18, thereby achieving release.

[0034] Operation hands-off method 2: Figure 5 As shown, by pressurizing the casing annulus, when the pressure reaches the preset starting force value, the piston starting pin 8 is cut off, so that the piston 10 moves up, the ratchet anchor claw 6 loses support and shrinks inward, and the pipe string is continuously lifted to remove the upper joint 1, the upper straightening ring 2, the anchoring short section 7, the piston 10, the ratchet anchor claw 6, the sealing mandrel 12, the sealing assembly 17, the guide shoe 19 and the first O-ring 3, the third O-ring 9, the fourth O-ring 11, the second O-ring 14, the first fixing pin 4, the piston starting pin 8, and the fourth fixing pin 13 from the sealing cylinder 18, thereby achieving release;

[0035] Operation hands-free method three: Figure 5As shown, directly lift the pipe string so that the lifting load of the pipe string is greater than 60t, the ratchet anchor claw 6 breaks and separates from the weak point, and continue to lift the pipe string to extract the upper joint 1, the upper straightening ring 2, the anchoring short section 7, the piston 10, the sealing core shaft 12, the sealing assembly 17, the guide shoe 19 and the first O-ring 3, the third O-ring 9, the fourth O-ring 11, the second O-ring 14, the first fixing pin 4, the piston starting pin 8, and the fourth fixing pin 13 from the sealing cylinder 18, thereby achieving release.

[0036] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims.

[0037] The various aspects disclosed for describing the present specification and claims are merely examples, and therefore, the present specification and claims are not limited to the details shown. In the above description, when the detailed description of the related known functions or configurations is determined to be unnecessary to obscure the focus of the present specification and claims, the detailed description will be omitted.

[0038] Finally, it should be pointed out that the above content is a further detailed description of the invention in combination with specific implementation methods. It cannot be considered that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, simple replacements made without departing from the concept of the present invention should be regarded as belonging to the protection scope of the present invention. The above embodiments are only more representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there can be many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

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

2. The pipe column composite safety release device according to claim 1, characterized in that: The straightening mechanism comprises an upper straightening ring (2) abutting against a positioning boss of the upper joint (1) through a thread, the upper straightening ring (2) being fixed to the upper joint (1) through a first fixing pin (4), and also comprises a lower straightening ring (16) abutting against a positioning boss of the sealing cylinder (18) through a thread, the lower straightening ring (16) being fixed to the sealing cylinder (18) through a second fixing pin (15).

3. The pipe column composite safety release device according to claim 2, characterized in that: The fixed connection mechanism comprises an anchoring pup joint (7) which is abutted against a positioning boss of the upper joint (1) through a thread, the anchoring pup joint is fixed to the upper joint through a third fixing pin (5), the other end of the anchoring pup joint (7) is abutted against a positioning boss of a sealing core shaft (12) through a thread, the anchoring pup joint (7) is fixed to the sealing core shaft (12) through a fourth fixing pin (13), the lower end of the sealing core shaft (12) is abutted against a positioning boss of a guide shoe (19) through a thread, and a ratchet anchor claw (6) is sleeved on the anchoring pup joint (7), and the ratchet anchor claw (6) is connected to the sealing cylinder (18) through an inner buckle.

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

5. The pipe column composite safety release device according to claim 3 is characterized in that: The ratchet anchor claw (6) is designed with a plurality of evenly distributed grooves on the inner side, the anchoring short section (7) is embedded and matched with the ratchet anchor claw (6) through convex and concave platforms, the ratchet anchor claw (6) is provided with a left-handed thread buckle on the outer side, and a plurality of cuts are provided, and a 50t-60t weak point is provided at the upper part of the cut, and can be retracted inwardly.

6. The pipe column composite safety release device according to claim 3, characterized in that: The composite release mechanism comprises a piston (10) arranged below the ratchet anchor claw (6), the lower end surface of the piston (10) abutting against the upper end surface of the sealing core shaft (12), the outer circumference of the anchoring short section (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, a third O-ring (9) is provided in the O-ring sealing groove of the anchoring short section (7), a fourth O-ring (11) is provided in the O-ring sealing groove of the piston (10), and the anchoring short section A seal is formed between the anchoring nipple (7) and the piston (10) through the third O-ring (9) and the fourth O-ring (11); a piston starting pin (8) is connected to the piston (10) through a plurality of threaded holes evenly distributed on the piston (10) and fixed to the pin shear groove of the anchoring nipple (7); a pressure transmission hole is provided in the anchoring nipple (7); a cavity formed between the piston (10) and the anchoring nipple (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 pipe column.

7. The pipe column composite safety release device according to claim 3, characterized in that: The sealing mechanism comprises a sealing assembly (17) sleeved on the sealing core shaft (12), wherein the sealing assembly (17) comprises a metal backing ring (1701), a polymer retaining ring (1702), a polymer backing ring (1703), a rubber sealing ring (1704) and a metal spacer ring (1705), wherein the metal backing ring (1701), the polymer retaining ring (1702), the polymer backing ring (1703), the rubber sealing ring (1704) and the metal spacer ring (1705) form a seal with the sealing core shaft (12) and the sealing cylinder (18) in the form of multiple upper and lower sealing groups.

8. The pipe column composite safety release device according to claim 7, characterized in that: The metal back ring (1701) and the metal spacer ring (1705) are made of high-strength alloy steel material, 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.

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