CN2777183Y

CN2777183Y - Hydraulic joint for releasing gadget

Info

Publication number: CN2777183Y
Application number: CN 200520081401
Authority: CN
Inventors: 李静
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-01-26
Filing date: 2005-01-26
Publication date: 2006-05-03
Anticipated expiration: 2015-01-26

Abstract

The utility model relates to a hydraulic releasing joint which has the technical scheme that the utility model comprises an upper joint, O-shaped seal rings, a male pin, an outer sleeve, a spring pawl, a piston sleeve, an inner seal sleeve and a lower joint, wherein the upper part of the upper joint is connected with threads of a delivery pipe column, the lower part is connected with threads of the spring pawl, and inner threads are connected with inner seals; the inner surface of the piston sleeve is provided with two rows of O-shaped seal rings matched with the inner seals in a seal matching mode, and the outer surface is also provided with two rows of O-shaped seal rings matched with the inner surface of the upper joint in a seal matching mode; the top part of the piston sleeve is provided with a liquid inlet groove, a convex block at the lower part of the spring pawl is squeezed in a step of the outer sleeve by the lower part of the piston sleeve, the lower part of the out sleeve is connected with threads of the lower joint, and the lower part of the inner seal sleeve is provided with two rows of O-shaped seal rings matched with the lower joint in a seal matching mode. The utility model has the effects that the working procedure of rod throwing and shocking can be reduced when the utility model is used, the construction time is saved, and the construction cost is reduced; packer seat sealing and pipe column releasing can be completed simultaneously when the utility model is used.

Description

The fluid pressure type back-off sub

One, technical field: the utility model relates to a kind of oilfield pumping well water pack off and delivers a kind of downhole tool that tubing string and water plugging string are separated.

Two, background technology: the used back-off sub of oilfield machinery water blockoff at present is the back-off sub of caber impacting type, and as shown in Figure 2, it mainly is made up of the higher authorities 1, " O " RunddichtringO 2, pin 3, overcoat 4, spring detent 5, sliding sleeve 6, lower contact 8 etc.At first with water plugging string after the packer setting of precalculated position, from well head input give up bump rod or ball, bump rod or ball act on the sliding sleeve 6, under the effect of bump rod or ball, pin 3 are cut off again, sliding sleeve 6 is descending, spring detent 5 loses interior support.The upper lifting pipe post, spring detent 5 loses interior support.The upper lifting pipe art, top connection 1, spring detent 5, sliding sleeve 6 are separated with overcoat 4, lower contact 8 together, and tubing string is realized giving up.This back-off sub has the following disadvantages: 1, working procedure complexity, and well head must be suppressed before throw holding in both hands that pipeline and joint unload can caber; 2, the bump rod is hampered easily, although because the every oil pipe of going into the well is all tried to lead to, during operation, fall into junk sometimes, it is not in place down to cause input bump rod to be hampered, and causes the failure of giving up, and influences carrying out smoothly of plug water construction.

Three, summary of the invention: the purpose of this utility model is exactly the above-mentioned defective that exists at prior art, provides a kind of can avoiding to clash into the fluid pressure type back-off sub that rod is hampered owing to there are foreign material to give up in the oil pipe.

Its technical scheme is: comprise top connection, " O " RunddichtringO, pin, overcoat, spring detent, piston bush, inner seal sleeve, lower contact, wherein, top connection top and the screwed connection of delivery tubing string, bottom and spring detent screwed connection, interior screw thread is connected with interior sealing, the piston bush inner surface has twice " O " RunddichtringO and interior sealing to be sealed and matched, external surface also has twice " O " RunddichtringO and top connection inner surface to be sealed and matched, the piston bush top has a lead channel, thereby form a cavity with inner seal sleeve, the piston bush bottom is clamp-oned the projection of spring detent bottom in the step of overcoat, the overcoat bottom is connected with the lower contact cableties, the inner seal sleeve bottom has twice " O " RunddichtringO and lower contact to be sealed and matched, and outside aiming at lead channel, have a pressure transmission hole, the distance of pin and outer " O " RunddichtringO greater than it with spring detent on distance.

Effect of the present utility model is: the application of this instrument can reduce one time and throw the excellent operation of bump, saves the engineering time, has reduced operating expenses; The application of this instrument can realize that packer setting and tubing string are given up and finish simultaneously.

Four, description of drawings:

Accompanying drawing 1 is a structural representation of the present utility model;

Five, the specific embodiment:

Below in conjunction with accompanying drawing, the utility model will be further described:

As shown in Figure 1, the fluid pressure type back-off sub is made up of top connection 1, " O " RunddichtringO 2, pin 3, overcoat 4, spring detent 5, piston bush 6, inner seal sleeve 7, lower contact 8 etc.

Wherein, top connection 1 top and the screwed connection of delivery tubing string, bottom and spring detent 5 screwed connections, interior screw thread is connected with interior sealing 7, piston bush 6 inner surfaces have twice " O " RunddichtringO 2 and interior sealing 7 to be sealed and matched, external surface also has twice " O " RunddichtringO 2 and top connection 1 inner surface to be sealed and matched, piston bush 6 tops have a lead channel 9, thereby form a cavity with inner seal sleeve 7, clamp-on the projection of spring detent 5 bottoms in the step of overcoat 4 piston bush 6 bottoms, overcoat 4 bottoms are connected with lower contact 8 cableties, and inner seal sleeve 7 bottoms have twice " O " RunddichtringO 2 and lower contact 8 to be sealed and matched, and have a pressure transmission hole 10 outside aiming at lead channel 9, the distance of pin 3 and outer " O " RunddichtringO 2 is greater than the distance of it and spring detent 5 upper ends, this can prevent that under the effect of pressure, piston bush 6 is descending, and pressure leaks.Simultaneously, pressure acts on piston bush 6 soil by the pressure transmission hole 10 of inner seal sleeve 7, under the effect of pressure, at first pin 3 is cut off, piston bush 6 is descending, piston bush 6 bottoms and spring detent 5 are separated, this moment, spring detent 5 lost interior support, but was not having under the situation of upper lifting force, and this fluid pressure type back-off sub still keeps sealing state, can continue the set packer that pressurizes, set fully up to packer, the upper lifting pipe post supported in spring detent 5 loses and rebounded this moment, top connection 1, spring detent 5, inner seal sleeve 7, piston bush 6 together with overcoat 4, lower contact 8 is thrown off, and tubing string is realized giving up.

Claims

1, a kind of fluid pressure type back-off sub, comprise top connection (1), " O " RunddichtringO (2), pin (3), overcoat (4), spring detent (5), piston bush (6), inner seal sleeve (7), lower contact (8), it is characterized in that: top connection (1) top and the screwed connection of delivery tubing string, bottom and spring detent (5) screwed connection, interior screw thread is connected with interior sealing (7), piston bush (6) inner surface has twice " O " RunddichtringOs (2) and interior sealing (7) to be sealed and matched, external surface also has twice " O " RunddichtringOs (2) and top connection (1) inner surface to be sealed and matched, piston bush (6) top has a lead channel (9), thereby form a cavity with inner seal sleeve (7), clamp-on the projection of spring detent (5) bottom in the step of overcoat (4) piston bush (6) bottom, overcoat (4) bottom is connected with lower contact (8) cableties, inner seal sleeve (7) bottom has twice " O " RunddichtringOs (2) and lower contact (8) to be sealed and matched, and aiming at lead channel (9) is outer to have a pressure transmission hole (10), the distance of pin (3) and outer " O " RunddichtringO (2) is greater than the distance on it and the spring detent (5).