CN2632306Y

CN2632306Y - Double cylinder cleaning hole packer

Info

Publication number: CN2632306Y
Application number: CN 03267112
Authority: CN
Inventors: 王文龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-07-10
Filing date: 2003-07-10
Publication date: 2004-08-11
Anticipated expiration: 2013-07-10

Abstract

The utility model relates to a double cylinder seat seal balance well washing packer, which solves issues such as dislocking caused by big pressure difference in existed packer, clamping caused by big lower pressure difference and no dislocking. The utility model is characterized in that a baffle ring (3) and a spring (4) are arranged between the lower outer center pipe (5) of the upper joint and the well washing piston sleeve (2) in turn; the water filling hole (8, 20) are separately opened in the middle of the inner and outer center pipes (6, 5) and the lower part of the inner center pipe (6); The central section of the outer center pipe (5) corresponds to the upper head of the baffle ring (12), the balance hole (22, 14) are separately opened on the supporting baffle ring (15); The supporting piston (11) clamped by the supporting baffle ring (9, 12) is arranged under the washing well piston (7) between the outer shell (23) and the outer center pipe (5), the fastening screw (19) is arranged on the outer shell corresponding to the upper end of the supporting piston (11); The supporting baffle ring (15) is arranged between the lower end of the outer shell (23) and the outer center pipe (5). The effect of seat sealing and dislocking is good.

Description

A kind of twin-tub sets balanced type washing well packer

Technical field:

The utility model relates to the used seperated layer water injection packer in oil recovery field, belongs to a kind of twin-tub and sets balanced type washing well packer.

Background technology:

In the oil production engineering in oil field, often use packer, packer is exactly when seperated layer water injection multiple zone to be divided into some intervals, and the instrument of oil reservoir water absorption difference is regulated in oil reservoir control water filling.When needing deblocking, by the frictional force deblocking of packing element and sleeve pipe, the frictional force of packing element and sleeve pipe was big when packing element was crossed casing coupling or perforated interval, the packer deblocking during upper lifting pipe post.

Due to the structure of present employed packer, the pressure reduction that makes upper strata water injection pressure and strata pressure form directly acts on the deblocking pin, and hydraulic pressure difference produces downward thrust, and promptly deblocking power is greater than the setting force of packer, during water filling easily with the packer deblocking; Packing element is subjected to thrust upwards when pressing down when packer holds, the locking tooth of locking mechanism is the helical teeth shape, make packing element and locking mechanism push away tighter and tighter, greater than the frictional force of packing element and sleeve pipe, packer is deblocking not, and the deblocking pin is unreasonable because of structure design, packer can not deblocking, the packing element of can only grinding away, packing element this moment is stuck in the casing coupling place by not bad what packer even simultaneously, causes tubing string to dial the motionless stuck state that is in.

The utility model content:

Bear the big easy deblocking of pressure reduction in order to overcome existing packer, bear down the deficiency that pressure reduction greatly can't deblocking be in stuck state, the utility model provides a kind of twin-tub to set balanced type washing well packer, this packer has the deblocking of setting good effectiveness, can following pressure reduction deblocking and stuck state greatly and not more can not appear because of the big deblocking of last pressure reduction.

Technical solution adopted in the utility model is: this twin-tub sets balanced type washing well packer, comprise lower contact, interior exterior central tube, piston bush and shell body, be equipped with inner central tube and well-flushing piston bush inside and outside the top connection respectively, be equipped with baffle ring and spring successively between exterior central tube and the well-flushing piston bush under the top connection; The middle part of interior exterior central tube and the bottom of inner central tube have water injection hole; The upper end of the corresponding baffle ring in the middle part of exterior central tube and support baffle ring place have balance pipe respectively; Being equipped with the clamping of support baffle ring under the well-flushing piston between shell body and the exterior central tube has support piston, and is equipped with trip bolt on the shell body of corresponding support piston upper end; Be equipped with the support baffle ring between the lower end of shell body and the exterior central tube.

The inlet opening of above-mentioned piston bush and the gap slot of baffle ring are opposed; Locking tooth and lock sleeve are special type screw thread.

The beneficial effects of the utility model are: because well-flushing passage top inlet opening uses spring catch ring seal retaining, the well-flushing passage in making between exterior central tube and the feed pathway of well-flushing piston form passes a bridge, the pressure that goes up that packing element is born is delivered in two counter balance pocket, therefore make to press to be subjected to balance, can bear enough big last pressure reduction.The packer central tube has two holes, and one communicates with setting piston, and one communicates with the well-flushing piston, and two pistons upwards effects simultaneously form twin-tub and set when setting water filling, and setting force is big, the packing element compression closely, good sealing effect.

Description of drawings:

Fig. 1 is the utility model structure sectional view.

1-top connection among the figure, 2-piston bush, 3-baffle ring, 4-spring, the 5-exterior central tube, 6-inner central tube, 7-well-flushing piston, 8-water injection hole, the 9-baffle ring, 10-counter balance pocket, 11-support piston, 12-baffle ring, the 13-counter balance pocket, the 14-balance pipe, 15-supports baffle ring, and 16-locks tooth, the 17-lock sleeve, 18-piston bush, 19-supporting screw, 20-water injection hole, the 21-lower contact, the 22-balance pipe, the 23-shell body, 24-sets piston.

The specific embodiment:

Below in conjunction with accompanying drawing will the utility model is described in further detail:

Shown in Fig. 1, a kind of twin-tub sets balanced type washing well packer, comprise lower contact (1,21), interior exterior central tube (6,5), piston bush (2,18) and shell body 23, be equipped with inner central tube 6 and well-flushing piston bush 2 inside and outside the top connection 1 respectively, be equipped with baffle ring 3 and spring 4 successively between 1 time exterior central tube 5 of top connection and the well-flushing piston bush 2, the well-flushing passage in causing between exterior central tube and the feed pathway of well-flushing piston form passes a bridge, the pressure that goes up that packing element is born is delivered to counter balance pocket (10,13) therefore balance makes to press to be subjected to balance, can bear enough big last pressure reduction, the gap slot of inlet opening on the piston bush 2 and baffle ring 3 is opposed, helps flushing fluid and enters the well-flushing passage smoothly; Interior exterior central tube (6, the bottom of middle part 5) and inner central tube 6 has water injection hole (8,20), and water injection hole 8 communicates with well-flushing piston 7, water injection hole 20 with set piston 24 and communicate, when setting, the liquid that enters from water injection hole (8,20) acts on well-flushing piston 7 simultaneously and sets on the piston 24, the formation twin-tub sets, setting force is big, and the packing element compression is tight, and packing is effective; The upper end of the corresponding baffle ring 12 in the middle part of exterior central tube 5 and support baffle ring 15 places have balance pipe (22,14) respectively, and from then on anti-flushing well liquid can enter counter balance pocket (10,13), plays the effect of equilibrium pressure; Well-flushing piston between shell body 23 and the exterior central tube 5 is equipped with the support piston 11 that supports baffle ring (9,12) clamping for 7 times, and is equipped with trip bolt 19 on the shell body 23 of corresponding support piston 11 upper ends; Be equipped with between the lower end of shell body 23 and the exterior central tube 5 and support baffle ring 15, stop the anti-flushing well liquid effects excessive, deblocking when making packer not need deblocking in the pressure of locking mechanism; Locking tooth 16 is special type screw thread with lock sleeve 17, and step lock is not given up the throne, and locking effect is good.

Flushing fluid when anti-flushing well can be from balance pipe (22,14) enter counter balance pocket (10,13) with the fluid pressure of balance flushing fluid, alleviate being stressed of retaining mechanism, simultaneously retaining mechanism is with special type thread lock, ring is broken in the big envelope use of separating of fixedly locked ring, deblocking power is stable, can guarantee the deblocking of multiple-string packer, avoids packer when not needing deblocking, because of the well-flushing fluid pressure makes the packer deblocking greatly, twin-tub sets, and setting force is big, and the packing element compression closely, good sealing effect reaches the effective purpose of packer setting.

Claims

1, a kind of twin-tub sets balanced type washing well packer, comprise lower contact (1,21), interior exterior central tube (6,5), piston bush (2,18) and shell body (23), be equipped with inner central tube (6) and well-flushing piston bush (2) inside and outside the top connection (1) respectively, it is characterized in that: be equipped with baffle ring (3) and spring (4) successively between exterior central tube (5) and the well-flushing piston bush (2) under the top connection (1); The bottom of the middle part of interior exterior central tube (6,5) and inner central tube (6) has water injection hole (8,20); The upper end of the corresponding baffle ring in the middle part of exterior central tube (5) (12) and support baffle ring (15) locate to have respectively balance pipe (22,14); Be equipped with the support piston (11) that supports baffle ring (9,12) clamping under the well-flushing piston (7) between shell body (23) and the exterior central tube (5), and be equipped with trip bolt (19) on the shell body (23) of corresponding support piston (11) upper end; Be equipped with between the lower end of shell body (23) and the exterior central tube (5) and support baffle ring (15).

2, a kind of twin-tub according to claim 1 sets balanced type washing well packer: it is characterized in that: the gap slot of the inlet opening of piston bush (2) and baffle ring (3) is opposed.

3, a kind of twin-tub according to claim 1 sets balanced type washing well packer: it is characterized in that: locking tooth (16) is special type screw thread with lock sleeve (17).