CN2763457Y

CN2763457Y - Normal open check valve in bottom of whipstock

Info

Publication number: CN2763457Y
Application number: CN 200420122133
Authority: CN
Inventors: 常青忠; 王眉山; 吴建文; 肖仰德; 刘刚; 王利华
Original assignee: Drilling Engineering Co Of Dagang Oilfield Group; Dagang Oilfield Group Co Ltd
Current assignee: CNPC Bohai Drilling Engineering Co Ltd
Priority date: 2004-12-29
Filing date: 2004-12-29
Publication date: 2006-03-08
Anticipated expiration: 2014-12-29

Abstract

The utility model relates to a normal opening check valve at the bottom of a whipstock, which is mainly used for whipstock seat sealing when the whipstock is lowered into sidetracking wells. The existing check valve at the bottom of the whipstock can only run downwards but can not be lifted upwards, otherwise seat sealing accidents of the whipstock are easy to generate. The normal opening check valve provided by the utility model is composed of a lower main body of the whipstock, a valve seat, a piston, an upper part inner cylinder and an upper part outer cylinder, which is characterized in that an inner cavity of the valve seat is provided with a spring, a valve body of a one-way valve is supported by the upper part of the spring, the upper end of the valve body of the one-way valve is provided with a flow passage, the top part of the valve body of the one-way valve is provided with an O-shaped sealing ring, and the bottom part of the spring is provided with upper and lower opening baffle plates and a screen mesh plate. The flow passage of the upper end of the valve body causes inner and outer liquid of the whipstock to be always stayed in a communicated state. The inner and outer fluid column pressure differences of a drill rod can not be formed whatever the whipstock is lifted or lowered. The seat sealing of the whipstock can be realized as required through a method that the inner part of the drill rod is pressurized, and channels in the whipstock are sealed by the O-shaped sealing ring.

Description

Ball-and-seat is often opened in the whipstock bottom

Technical field

The utility model relates to a kind of whipstock bottom and often opens ball-and-seat, is mainly used in sidetracked hole seat envelope whipstock when being lowered to whipstock, is a kind of wellbore tool of special use, belongs to the petroleum machinery field.

Background technology

Existing whipstock bottom ball-and-seat, be to be sitting on the ball seat with a steel ball, formed a normally closed ball-and-seat, the problem that exists is that whipstock can only be walked downwards and can not upwards carry, whipstock is walked downwards, and the fluid column in the sleeve pipe can back down steel ball and make that drilling tool is identical with casing annulus liquid, pressure is consistent; If will on carry whipstock, steel ball is sat and will will be formed fluid column pressure reduction inside and outside the drilling rod on ball seat, this pressure reduction will make thrust piston move, and makes whipstock not arriving the preposition envelope of taking one's seat, and causes the accident.

Summary of the invention

The purpose of this utility model is to provide a kind of whipstock bottom often to open ball-and-seat, to overcome the problem that existing whipstock bottom ball-and-seat exists, guarantees that whipstock arrives precalculated position seat envelope.

The utility model adopts following technical scheme, be that ball-and-seat is often opened by body under the whipstock in a kind of whipstock bottom, valve seat, the inner casing on piston and top and outer shell are formed, valve seat places chamber body under the whipstock, between following body and the valve seat piston is housed, piston respectively with the outer inside wall of cylinder, valve seat outer wall sealing contact, the inner casing on top and valve seat screwed connection, it is characterized in that being equipped with in the valve base cavity spring, spring upper support one way valve valve body, there is fluid course one way valve valve body upper end, " O " shape sealing ring is arranged at one way valve valve body top, and the upper and lower opening baffle plate is equipped with in the bottom of spring, screen stencil sheet.

Operating principle of the present utility model is that the one way valve valve body is in upper dead center position under the support of spring, the fluid course of valve body upper end, make the inside and outside liquid of whipstock be in connected state all the time, on carry whipstock and still transfer whipstock and can not make the inside and outside fluid column pressure reduction that forms of drilling rod; If want seat envelope whipstock, then in drilling rod, suppress, hydraulic action in the drilling rod is on the end face of ball-and-seat, one way valve valve body compression spring is moved down, seal the interior passage of whipstock by " O " shape sealing ring, will make the inside and outside fluid column pressure reduction that forms of whipstock, when pressure reduction is big, the disconnected pin of the piston section of cutting is descending, just can realize whipstock seat envelope.

Description of drawings

Fig. 1, existing whipstock bottom ball-and-seat structural representation

Fig. 2, the ball-and-seat structural representation is often opened in the whipstock bottom of utility model

Among Fig. 2, body 1, valve seat 2, piston 3, inner casing 4, outer shell 5, spring 6, one way valve valve body 7, fluid course 8, " O " shape sealing ring 9, upper and lower opening baffle plate 10, screen stencil sheet 11, pin 12 under the whipstock.

The specific embodiment

Below in conjunction with drawings and Examples, structure of the present utility model is further specified, ball-and-seat is often opened by body under the whipstock 1 in the whipstock bottom, valve seat 2, the inner casing 4 on piston 3 and top and outer shell 5 are formed, valve seat 2 places body 1 inner chamber under the whipstock, between following body 1 and the valve seat 2 piston 3 is housed, piston 3 respectively with the inwall of outer shell 5, the outer wall sealing contact of valve seat 2, the inner casing 4 and valve seat 2 screwed connections on top, it is characterized in that in valve seat 2 inner chambers spring 6 being housed, one way valve valve body 7 of spring 6 upper support, there is fluid course 8 one way valve valve body upper end, " O " shape sealing ring 9 is arranged at one way valve valve body top, and upper and lower opening baffle plate 10 is equipped with in the bottom of spring 6, screen stencil sheet 11.Pin 12 is used for temporary transient fixed piston 3.

Utilize whipstock of the present utility model bottom often to open ball-and-seat and can guarantee whipstock emergency seat envelope when arriving the precalculated position.

Claims

1, ball-and-seat is often opened by body under the whipstock (1) in a kind of whipstock bottom, valve seat (2), the inner casing (4) on piston (3) and top and outer shell (5) are formed, valve seat (2) places body under the whipstock (1) inner chamber, between following body (1) and the valve seat (2) piston (3) is housed, piston (3) respectively with the inwall of outer shell (5), the outer wall sealing contact of valve seat (2), inner casing on top (4) and valve seat (2) screwed connection, it is characterized in that in valve seat (2) inner chamber spring (6) being housed, spring (a 6) one way valve valve body of upper support (7), there is fluid course (8) one way valve valve body (7) upper end, " O " shape sealing ring (9) is arranged at one way valve valve body (7) top, and upper and lower opening baffle plate (10) is equipped with in the bottom of spring (6), screen stencil sheet (11).