CN208106360U - Internal-and external diameter salvages buffer-type back-off sub - Google Patents

Abstract

The utility model proposes internal-and external diameters to salvage buffer-type back-off sub.Back-off sub includes top connection, the top connection lower thread is connected with lock claw, the lower part of lock claw is the swollen pawl of bar shaped, the lower end outer wall of bar shaped is swollen pawl is equipped with locking boss, the inner wall of top connection and lock claw is connected with sliding sleeve by shear pin, the outer wall of sliding sleeve is equipped with shoulder, the outer wall of sliding sleeve lower end is equipped with positive stop lug boss and is in close contact with lock claw lower end inner wall, top connection lower end outer wall and lock claw outer wall are equipped with housing, the shoulder of outer casing inner wall and locking boss clamping, the outer diameter on housing top is less than the outer diameter of its underpart, housing lower thread is connected with lower contact, piston and spring are installed in the ring cavity between lower contact and housing, inlet opening is provided on lower contact wall above piston, fluid hole is provided on overcoat wall below piston.The back-off sub of the application can not only realize interior fishing and the salvaging of outer fishing lance may be implemented, fish out inside cannot in the case where without overhaul, and ensure smoothly to give up.

Description

Internal-and external diameter salvages buffer-type back-off sub

Technical field：

The utility model relates to the devices that tubing string is delivered in the disengagement used on a kind of oil field, especially can within fishing it is again convenient The back-off sub of outer fishing.

Background technique：

Currently, common back-off sub has two on oil field, first is that may only in fishing, using 2 cun of half oil pipe outside It fishes out lance to salvage, if interior do not fish out, overhaul is needed to handle；Second is that cannot ensure to give up smoothly in principle, it will cause and give up It does not open.

Utility model content：

In order to solve the technical problems in background technology, the utility model, which provides a kind of internal-and external diameter and salvages buffer-type, loses Hand connector, the back-off sub of the application can not only realize interior fishing and the salvaging of outer fishing lance may be implemented, fish out inside cannot in the case where Without overhaul, and ensure smoothly to give up.

The technical solution of the utility model is：Internal-and external diameter salvage buffer-type back-off sub include top connection, it is described on connect Head lower thread is connected with lock claw, and the lower part of lock claw is the swollen pawl of bar shaped, and the lower end outer wall of bar shaped is swollen pawl is equipped with locking boss, above connects Head and the inner wall of lock claw are connected with sliding sleeve by shear pin, and the outer wall of sliding sleeve is equipped with shoulder, and the outer wall of sliding sleeve lower end is equipped with limit convex It platform and is in close contact with lock claw lower end inner wall, top connection lower end outer wall and lock claw outer wall are equipped with housing, the shoulder of outer casing inner wall With locking boss clamping, housing is variable-diameter structure, and the outer diameter on housing top is less than the outer diameter of its underpart, housing lower end It is threaded with lower contact, lower contact extends in housing and forms ring cavity, the ring cavity between lower contact and housing between housing Piston and spring are inside installed, inlet opening is provided on the lower contact wall above piston, is provided with out liquid on the overcoat wall below piston Hole.

The utility model has the advantages that：Existing top of fish outer diameter is typically designed as Φ 104mm~Φ 98mm not The case where being suitble to outer fishing, the top of fish outer diameter of the application is designed as the back-off sub of Φ 89mm, with 2 cun of half tubing coupling size phase Together, if interior fishing is not salvaged using die nipple using outer diameter at can be convenient.Release buffer structure has also been devised in the application, avoids The ball thrown in place after, form hydraulically full dead space with " lower part " and cause sliding sleeve that cannot move down since liquid is incompressible.

Detailed description of the invention：

Fig. 1 is the structural schematic diagram of the utility model；

1. top connection in figure, 2. sliding sleeves, 3. inlet openings, 4. shear pins, 5. locking boss, 6. shoulders, 7. lock claw, 8. housings, 9. piston, 10. bar shapeds are swollen pawl, 11. positive stop lug boss, 12. springs, 13. lower contacts.

Specific embodiment：

The utility model is described in further detail with reference to the accompanying drawing：

By as shown in the figure, it includes top connection 1 that internal-and external diameter, which salvages buffer-type back-off sub, 1 lower thread of top connection It is connected with lock claw 7, lock claw 7 is put rear lock claw 7 aside and disengaged with housing 8, the lower part of lock claw 7 is the swollen pawl of bar shaped for connecting housing 8 10, the lower end outer wall of bar shaped is swollen pawl 10 is equipped with locking boss 5, and the inner wall of top connection 1 and the inner wall of lock claw 7 are connected by shear pin 4 There is sliding sleeve 2, shear pin 4 is cut after pitching, and 2 upper end inner wall of sliding sleeve, which matches for the conical surface with the outer surface of pitching, is conducive to shear pin 4 It is smoothly given up by cutting.The outer wall of sliding sleeve 2 is equipped with shoulder 6, and the shoulder 6 when 2 downlink of sliding sleeve on sliding sleeve 2 is stuck in the between outer land of lock claw 7 There is position-limiting action to sliding sleeve 2 on shoulder, the outer wall of 2 lower end of sliding sleeve is equipped with positive stop lug boss 11 and closely connects with 7 lower end inner wall of lock claw Touching, positive stop lug boss 11 is in close contact with 7 lower end inner wall of lock claw guarantees that lock claw 7 is connect with housing 8,1 lower end outer wall of top connection and lock 7 outer wall of pawl is equipped with housing 8, and the shoulder of 8 inner wall of housing and locking boss 5 are clamped, and housing 8 is variable-diameter structure, 8 top of housing it is outer Diameter size is less than the outer diameter of its underpart, and 8 top outer diameter of housing is Φ 89mm, and 8 lower outer diameter of housing is 104mm~Φ 98mm, since to be less than lower outer diameter identical with 2 cun of half tubing coupling size for the design of 8 top outer diameter of housing, if interior can not fish out can Easily die nipple to be used to salvage using outer diameter.8 lower thread of housing is connected with lower contact 13, and lower contact 13 extends to housing 8 It is interior that ring cavity is formed between housing 8, piston 9 and spring 12 be installed, on piston 9 in the ring cavity between lower contact 13 and housing 8 It is provided with inlet opening 3 on 13 wall of lower contact of side, is provided with fluid hole on 8 wall of housing of 9 lower section of piston.When pitching is suppressed, give up Connector inner cavity is hydraulically full, due to liquid be it is incompressible, in order to make ball lower inner cavity expand, guarantee smoothly give up increase buffering Structure, during pitching is suppressed, back-off sub intracavity liquid is entered the ring cavity between lower contact 13 and housing 8 by inlet opening 3 9 compressed spring 12 of piston is pushed, the ring intracavity liquid between lower contact 13 and housing 8 is discharged by the fluid hole on housing 8, is reached The discharged purpose of back-off sub intracavity liquid, sliding sleeve are smoothly moved down and (are smoothly given up).

In use, pitching is suppressed, under pressure, 2 downslide shear pin 4 of sliding sleeve is cut, lock claw during sliding sleeve 2 glides 7 lower ends lose limit, and the bar shaped of 7 lower part of lock claw is swollen, and pawl 10 shrinks lock claw 7 and the disengagement of housing 8, and realization is smoothly given up.Upper lifting pipe post Top connection 1, lock claw 7 and sliding sleeve 2 are mentioned outside well, and housing 8 and lower contact 13 stay in underground.

Claims (2)

1. a kind of internal-and external diameter salvages buffer-type back-off sub, including top connection (1), it is characterised in that：Under the top connection (1) End is threaded with lock claw (7), and the lower part of lock claw (7) is the swollen pawl of bar shaped (10), and the lower end outer wall of bar shaped is swollen pawl (10) is equipped with lock The inner wall of tight boss (5), top connection (1) and lock claw (7) is connected with sliding sleeve (2) by shear pin (4), and the outer wall of sliding sleeve (2) is equipped with Shoulder (6), the outer wall of sliding sleeve (2) lower end are equipped with positive stop lug boss (11) and are in close contact with lock claw (7) lower end inner wall, top connection (1) lower end outer wall and lock claw (7) outer wall are equipped with housing (8), the shoulder of housing (8) inner wall and locking boss (5) clamping, housing It (8) is variable-diameter structure, the outer diameter on housing (8) top is less than the outer diameter of its underpart, and housing (8) lower thread is connected with Lower contact (13), lower contact (13) extends in housing (8) forms ring cavity between housing (8), lower contact (13) and housing (8) Between ring cavity in piston (9) and spring (12) are installed, be provided with inlet opening (3) on lower contact (13) wall above piston (9), Fluid hole is provided on housing (8) wall below piston (9).

2. internal-and external diameter according to claim 1 salvages buffer-type back-off sub, it is characterised in that：Sliding sleeve (2) upper end inner wall It matches for the conical surface with the outer surface of pitching.