CN2364201Y - Top sealing packer for high-pressure co-injection well - Google Patents

Abstract

The utility model discloses a packer in oil gas field layering water injection development, specially adapted high pressure co-injection well protection upper portion sheathed tube top seals packer. The pressure-guiding device consists of an upper joint, an inner central tube, an outer central tube, an upper piston, a lower piston, a seat, a deblocking mechanism and a lower joint, wherein the inner central tube and the outer central tube are respectively provided with pressure-guiding holes. The utility model has the advantages of 1. the packer setting increases with the water injection pressure, can provide subsequent setting pressure difference for a long time, once the contact stress of the packer and the casing wall reduces, can continue to compress the compensation setting, ensures the long-term sealing of the packer, 2. the setting locking mechanism is relatively independent with the deblocking mechanism, can prevent midway deblocking.

Description

High pressure multilayer injector closedtop packer

The utility model relates to the packer in a kind of oil gas field seperated layer water injection exploitation, is specially adapted to the closedtop packer of high pressure multilayer injector protection upper sleeve.

The packer that is used for water injection well at present in the oil field is the Y34-114 type, and this packer has following shortcoming in use: 1, the lock ring locking back existence in the seat blocking tight body retreats phenomenon, has caused the packing element resilience, can not guarantee long term seal; 2, for packing element, can only obtain when envelope seat disposable seat seal pressure, thereafter because packing element bears pressure reduction, the shoulder evagination that flows diminishes in time gradually with the contact stress of sleeve pipe, and High-Pressure Water is along scurrying on the casing wall; 3, the seat blocking tight body is same overall structure with separating sealing mechanism, easily causes deblocking midway.

The purpose of this utility model just provides and a kind ofly can compensate stress relaxation, high pressure multilayer injector closedtop packer that can long-acting seat envelope.

The purpose of this utility model is achieved in that packer is made up of top connection, inside and outside central tube, upper piston, lower piston, lower contact, top connection, inner central tube, lower contact constitute the basic framework of packer by being threaded, the open slot that is inserted into inner central tube on the exterior central tube is interior and tight with the ring lock of locking, last lock ring and last lock are by being threaded, and last lock is fixed by shear pin and top connection; The backwash cover that is furnished with aperture be enclosed within on the exterior central tube after top connection is threaded, packing element, spacer ring, anti-protruding pad, upper piston are enclosed within on the exterior central tube, the lower end of exterior central tube is threaded with the lock ring seat, and following lock ring is placed in the cannelure of lock ring seat, and lock tube is enclosed within on the lock ring seat; Lower piston be enclosed within inner central tube and the lower contact and with the lock tube lap seal, inside and outside central tube has pressure guide hole.

The utility model compared with prior art has the following advantages: 1, increase along with water injection pressure after the packer set, the pressure reduction of seat envelope subsequently can be provided for a long time, in case the contact stress of packer and casing wall reduces, can continue compression compensation seat envelope, guarantee the long-term seal of packer; 2, the seat blocking tight body can prevent deblocking midway with to separate sealing mechanism relatively independent.

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

Fig. 1: packer construction schematic diagram;

Among the figure: 1-top connection, 2-shear pin, 3-inner central tube, the last lock of 4-,

The last lock ring of 5-, 6-backwash cover, 7-exterior central tube, 8-packing element, 9-spacer ring,

10-prevent lock ring under protruding pad, 11-pressure guide hole, 12-upper piston, 13-lock ring seat, the 14-,

15-lock tube, 16-lower piston, 17-pressure guide hole, 18-lower contact;

High pressure multilayer injector closedtop packer is made up of top connection 1, inner central tube 3, exterior central tube 7, upper piston 12, lower piston 16, lower contact 18, top connection 1, inner central tube 3, lower contact 18 constitute the basic framework of packer by being threaded, exterior central tube 7 upper ends be inserted in the open slot of inner central tube 3 and with last lock ring 5 lockings, last lock ring 5 and last lock 4 are by being threaded, and last lock 4 is fixing with top connection 1 by shear pin 2; The backwash cover 6 that has an aperture be enclosed within on the exterior central tube 7 after top connection 1 is threaded, packing element 8, spacer ring 9, anti-protruding pad 10, upper piston 12 are enclosed within on the exterior central tube 7, the lower end of exterior central tube 7 is threaded with lock ring seat 13, following lock ring 14 is placed in the cannelure of lock ring seat 13 by dowel fixes, lock tube 15 is enclosed within on the lock ring seat 13, following lock ring 14 and lock tube 15 are provided with the tooth of mutual interlock, they can be locked mutually, lower piston 16 be enclosed within inner central tube 3 and the lower contact 18 and with lock tube 15 lap seal, have pressure guide hole 11,17 on the inside and outside central tube 3,7.Cavity between backwash cover 6, inner central tube 3, exterior central tube 7, lock ring seat 13, lock tube 15 and the lower piston 16 is formed the backwash runner, upper and lower piston 12,16, lock ring seat 13, lock ring 14, lock tube 15 are formed seat blocking tight bodies down, separate sealing mechanism by inside and outside central tube 3,7, go up lock ring 5, go up lock 4 and backwash cover 6 is formed.

Being used for protecting the high-pressure water injection well upper sleeve to make the closedtop packer with packer below is that example is further described the utility model: the packer that the ground pressure testing is qualified is lowered into water injection well by designing requirement; when arriving design attitude; suppress from oil pipe; pressure acts on the lower piston 16 by the pressure transmission hole 17 of inner central tube bottom; promote lower piston 16; lock tube 15; upper piston 12; move compression packing element 8 on the anti-protruding pad 10; make packing element 8 radial dilatation; after being compressed to a certain degree; following lock ring 14 and lock tube 15 interlocks; locking; make packing element 8 be close to internal surface of sleeve pipe, thereby realize initial seat envelope process the packing of oil pipe annular space.

In the injecting process, water injection pressure is greater than packer top pneumatics power not, thereby on upper and lower piston 12,16, there is pressure reduction respectively, and the sectional area ratio upper piston 12 of lower piston 16 is big, to liken the last pressure reduction that is used on the upper piston 12 to big so act on following pressure reduction on the lower piston 16, and it is up to promote the seat sealing mechanism under differential pressure action down, and an envelope power affords redress, compression packing element 8 is realized the pressure reduction sealing.

When the need anti-flushing well, squeeze into flushing fluid from the oil jacket annular space, the toroidal cavity that flushing fluid is formed through backwash cover 6, inner central tube 3, exterior central tube 7, lock ring seat 13, lock tube 15 acts on the lower piston 16, promote the lower piston 16 descending well-flushing passages that expose, flushing fluid just flows into the packer bottom, enter the station after returning to the oil pipe inner chamber to well head from the tubing string bottom again, realize anti-flushing well.Carry out water filling after well-flushing is finished again, under the effect of lower piston inside and outside differential pressure, lower piston is up, and sealing backwash passage is realized normal water filling.

As long as the upper lifting pipe post is cut off shear pin 2, move on top connection 1, the inner central tube 3 when needing deblocking, last lock ring 5 releases, exterior central tube 7, upper and lower piston 12,16, lock tube 15 are descending, and packing element 8 reclaims, the realization deblocking.

Claims (1)

1, high pressure multilayer injector closedtop packer is made up of top connection (1), inside and outside central tube (3), (7), upper and lower piston (12), (16), lower contact (18), top connection (1), inner central tube (3), lower contact (18) constitute the basic framework of packer by being threaded, it is characterized in that: exterior central tube (7) upper end is inserted in the open slot of inner central tube (3) and with last lock ring (5) and locks, last lock ring (5) and last lock (4) are by being threaded, and last lock (4) is fixing by shear pin (2) and top connection (1); The backwash cover (6) that has an aperture be enclosed within on the exterior central tube (7) after top connection (1) is threaded, packing element (8), spacer ring (9), anti-protruding pad (10), upper piston (12) is enclosed within on the exterior central tube (7), the lower end of exterior central tube (7) is threaded with lock ring seat (13), following lock ring (14) is placed in the cannelure of lock ring seat (13) by dowel fixes, lock tube (15) is enclosed within on the lock ring seat (13), lower piston (16) be enclosed within that inner central tube (3) and lower contact (18) are gone up and with lock tube (15) lap seal, in, exterior central tube (3), (7) have pressure guide hole (11), (17).

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