CN2616669Y

CN2616669Y - Double-sealing flushing packer

Info

Publication number: CN2616669Y
Application number: CN 03251071
Authority: CN
Inventors: 尹婷
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-05-10
Filing date: 2003-05-10
Publication date: 2004-05-19
Anticipated expiration: 2013-05-10

Abstract

The utility model belongs to a downhole tool for packing downhole horizon in an oilfield which is designed for bearing a great pressure difference between oil horizons. A spring 25 of the utility model is embedded outside an inner central tube 3 and arranged between a top sub 1 and a well washing valve 5. A pressure transfer hole 26 and a setting pressure transfer 23 are arranged at the cavity and the inner central tube 3 aligning the spring 25. The utility model has the advantages of packing tubing-casing annular space for a long time and bearing higher horizon pressure differences, and other advantages.

Description

A kind of double-sealing washing well packer

Technical field: the utility model belongs to the downhole tool that a kind of oil field is used for packing well lower floor position.

Background technology: during traditional waterflood well packer setting, only adopt single-stage pressure transmission chamber, this when in oil pipe, pressurizeing, driving force is less, and under the bigger situation of interlayer pressure difference, the deblocking pin is stressed bigger, cause packer to lose efficacy easily, and the well-flushing valve is in oil pipe and oil jacket annular pressure when equating, the well-flushing valve can not reset behind the well-flushing, also can cause packer up and down oil reservoir scurry logical.

Summary of the invention: the purpose of this utility model provides a kind of double-sealing washing well packer of big pressure reduction between carrying oil.

The utility model is made up of top connection, O RunddichtringO, inner central tube, well-flushing cover, well-flushing valve, two convex cushion rubber, spacer ring, locknut, limit packing element, exterior central tube, middle packing element, pressure bearing head, upper piston cover, pin extension, seat offset nail, deblocking pin, clip spring seat, jump ring, lower piston cover, lock ring, lower piston, lower contact, spring members.

Wherein be connected with inner central tube, well-flushing threading respectively inside and outside the top connection, be connected with inner central tube, well-flushing threading respectively inside and outside the well-flushing valve top, and by O RunddichtringO sealing, the outside, well-flushing valve bottom connects the top of exterior central tubes by two convex rubber sealings, and with the drain channel connection.The corresponding drain passage of exterior central tube is inserted in limit packing element, spacer ring, middle packing element outward successively, pressure bearing head upper end footstock withstands the limit packing element, its lower end is connected with the upper piston threading, pin is hung with clip spring seat and is linked together by the deblocking pin, jump ring is stuck on the clip spring seat, is tightly connected by the O RunddichtringO with inner central tube, lower piston cover respectively inside and outside the lower piston.Be connected with inner central tube, lower piston threading respectively inside and outside the lower contact.

Spring housing is outside inner central tube, and place between top connection and the well-flushing valve, alignment springs and plenum chamber place have pressure transmission hole and set pressure transmission hole about the inner central tube, have the drain passage between inner central tube and the exterior central tube, upper piston cover middle part links together by seat offset nail with the lower piston cover, and its inner underside is connected with pin extension, clip spring seat, lock ring respectively.

The utlity model has following advantage:

1, the utility model is designed to the socket double-piston and sets, the oil jacket of packing for a long time annular space, and can bear higher interlayer pressure difference;

2, can remove card apart from mechanical admixtures such as the greasy dirt incrustation scale of interior oil jacket annular space and tube inner wall bonding and silts, prevent, reduce and inject the injury of liquid, reduce and stablizes water injection pressure oil reservoir.

Description of drawings: Fig. 1 is the utility model structure diagram.

The specific embodiment: the utility model is made up of top connection 1, O RunddichtringO 2, inner central tube 3, well-flushing cover 4, well-flushing valve 5, two convex cushion rubber 6, spacer ring 7, locknut 8, limit packing element 9, exterior central tube 10, middle packing element 11, pressure bearing head 12, upper piston cover 13, pin extension 14, seat offset nail 15, deblocking pin 16, clip spring seat 17, jump ring 18, lower piston cover 19, lock ring 20, lower piston 21, lower contact 22, spring 25 parts.

Wherein overlap 4 screwed connections with inner central tube 3, well-flushing respectively inside and outside the top connection 1, overlap 4 screwed connections with inner central tube 3, well-flushing respectively inside and outside well-flushing valve 5 tops, and by 2 sealings of O RunddichtringO, the well-flushing valve 5 bottoms outsides is by the be tightly connected top of exterior central tube 10 of two convex cushion rubbers 6, and is communicated with drain passage 24.Exterior central tube 10 corresponding drain passage 24 outer limit packing element 9, spacer ring 7, the middle packing elements 11 of being inserted in successively, pressure bearing head 12 upper end footstocks withstand limit packing element 9, its lower end and upper piston overlap 13 screwed connections, pin extension 14 links together by deblocking pin 16 with clip spring seat 17, jump ring 18 is stuck on the clip spring seat 17, is tightly connected by O RunddichtringO 2 with inner central tube 3, lower piston cover 19 respectively inside and outside the lower piston 21.Overlap 19 screwed connections with inner central tube 3, lower piston respectively inside and outside the lower contact 22.

Spring 25 is enclosed within outside the inner central tube 3, and place between top connection 1 and the well-flushing valve 5, inner central tube about in the of 3 alignment springs 25 have pressure transmission hole 26 and set pressure transmission hole 23 with the plenum chamber place, have drain passage 24 between inner central tube 3 and the exterior central tube 10, upper piston overlaps 13 middle parts and lower piston cover 19 links together by seat offset nail 15, and its inner underside is connected with pin extension 14, clip spring seat 17, lock ring 20 respectively.

When the utility model sets, at first positive fluid injection in the oil pipe, hydraulic pressure enters well-flushing valve chamber from the top pressure transmission hole 26 of inner central tube 3, it is descending to promote well-flushing valve 5, close inlet opening and inner central tube 3 on the well-flushing cover 4, the drain passage 24 that exterior central tube is 10, the utility model oil jacket annular space up and down can not be communicated with, and enter the two poles of the earth piston chamber up and down from the pressure transmission hole 23 that sets of inner central tube 3 middle parts and bottom, cut off an offset nail 15, by pressure bearing head 12 compression limit packing elements 9, middle packing element 11, make its expanded radially Seal Oil cover annular space, the lock ring 20 that this moment, upper piston overlapped on 13 is gone up jump ring 18 more, because lock ring 20 is equidirectional with the buttless thread uniform pitch of jump ring 18, profile of tooth is coincide, even oil pressure descends, limit packing element 9, middle packing element 11 can not shrink, and reaches the purpose of long-term packing oil jacket interannular.

During anti-flushing well, water under high pressure enters well-flushing valve chamber from the oil jacket annular space through the inlet opening of well-flushing cover 4 and promotes well-flushing valve 5 and go upward to top, well-flushing valve chamber, get out of the way the drain passage 24 of 3 of inner central tubes, flushing fluid is crossed limit packing element 9, middle packing element 11 and is entered oil jacket annular space below the utility model from the eyelet of pressure bearing head 12, and then the fluid hole of the eccentric injection mandrel main body that connects from its underpart enters, from the oil pipe ground of backflowing out, reach the purpose of anti-flushing well.

During deblocking, the upper lifting pipe post, by top connection 1, inner central tube 3 is being with pin to hang 14, clip spring seat 17, locknut 8 is up together, limit packing element 9, middle packing element 11 is stuck on the sleeve pipe motionless, and pressure bearing head 12, upper piston cover 13 buttless threads through lock ring 20 are meshed with jump ring 18, power is passed to clip spring seat 17, produce the relative motion of 17 of pin extension 14 and clip spring seats, connector deblocking pin 16 therebetween is sheared under the effect of the last power of lifting, making clip spring seat 17 and pin hang 14 separates, at limit packing element 9, pressure bearing head 12 under the elastic force effect of middle packing element 11, lower piston cover 19 is descending in the lump, limit packing element 9, deblockings are restored in middle packing element 11 elongations.

Claims

1, a kind of double-sealing washing well packer, it is made up of top connection (1), O RunddichtringO (2), inner central tube (3), well-flushing cover (4), well-flushing valve (5), two convex cushion rubber (6), spacer ring (7), locknut (8), limit packing element (9), exterior central tube (10), middle packing element (11), pressure bearing head (12), pin extension (14), seat offset nail (15), deblocking pin (16), clip spring seat (17), jump ring (18), lower piston cover (19), lock ring (20), lower piston (21), lower contact (22) parts;

It is characterized in that: it is also by upper piston cover (13), spring (25) parts are formed, its medi-spring (25) is enclosed within outside the inner central tube (3), and place between top connection (1) and the well-flushing valve (5), inner central tube (3) alignment springs (25) up and down has pressure transmission hole (26) and sets pressure transmission hole (23) with the plenum chamber place, have drain passage (24) between inner central tube (3) and the exterior central tube (10), upper piston cover (13) middle part links together by seat offset nail (15) with lower piston cover (19), and its inner underside is hung (14) with pin respectively, clip spring seat (17), lock ring (20) connects.