CN2869301Y - Compression type low-pressure sealing-test packer - Google Patents

Abstract

The utility model relates to a compression packer with low pressure seal examination, mainly used for the problems of unreliable seal examination of current packer and high examining pressure, characterized in that a balancing chamber (10) is provided under a upper connector (1) and between a upper casing (5) and a central tube (3); a balancing chamber upper body (11), under which a balancing piston (12) is fixed, is connected with the inside of the chamber (10) and the central tube (3); a seating sealed base (15), in which a clamping spring seat (17) is cutting covered on a deblocking block (16) and a protective locking block (19) is fixed in the downside holes, is connected with the central tube (3) in a deblocking casing (4); a spacer ring (20) of the protective locking block (19) is connected with shaft of a rubber tube (8) under the protective locking block (19); a pin (14) on a sealing examining piston (7) is fixed on a slideway (21) of the seating sealing piston (6). The compression packer with low pressure seal examination has the advantages of high reliability of sealing examination and low sealing examining pressure.

Description

Compression low pressure is tested sealed packer

Technical field:

The utility model relates to the used packer of water blockoff in the oil recovery field, oil field, and especially compression low pressure is tested sealed packer.

Background technology:

In oil recovery field, oil field, because of exploitation for a long time, the part reservoir water flooding forms water stream channel, causes and injects the invalid poor efficiency circulation of water, and the low pressure and low permeability layer can not get employing preferably, need take the water blockoff measure to block up high aquifer, improves the development degree of low pressure and low permeability layer.Need packer with the destination layer packing during water blockoff, sealing layer is not recovered the oil.And at present used packer because of reasons in structure when testing envelope, exist that to test envelope unreliable, the pressure height of requirement when testing envelope, seat envelope efficient is low, is unfavorable for applying.

The utility model content:

For solve existing every device test envelope unreliable, test the high problem of seal pressure, the utility model provides a kind of compression low pressure to test sealed packer, this compression low pressure is tested sealed packer and is not only tested envelope reliability height, and has low, the easy to use characteristics of the seal pressure of testing.

The technical solution of the utility model is: this compression low pressure is tested sealed packer and is comprised the packing element axle, test the envelope piston, seat envelope piston, on, the lower casing body, the deblocking housing, on central tube reaches, lower contact, below the top connection, between last shell body and central tube counter balance pocket is arranged, in the counter balance pocket, be connected with the counter balance pocket upper body on the central tube, counter balance pocket inner equilibrium chamber is equipped with dummy piston under the upper body, be connected by pin between last shell body and deblocking housing and deblocking housing and upper pressing cap, be connected with seat envelope pedestal on the deblocking housing inner central tube, be covered with clip spring seat by the deblocking lock dog in the seat envelope pedestal, the clip spring seat inner groovy is built-in with the jump ring of inner surface belt card tooth, stomidium is built-in with the protection lock dog that an end and deblocking housing inner groovy touch mutually under the seat envelope pedestal, under the protection lock dog protection lock dog back-up ring that links to each other with the packing element axle is arranged, there is the card tooth that matches with jump ring packing element axle upper end; The pin of testing on the envelope piston between lower contact upper center tube and lower casing body places in the seat envelope piston inverted v-shaped slideway, tests envelope piston upper end oil jacket shading ring in the seat envelope piston and is with spring outward.

The utlity model has following beneficial effect: this compression low pressure is tested sealed packer owing to take such scheme, adopted slideway type seat seal structure, guaranteed that packer has discharged and falls pressure after, test sealing mechanism and just can open, thereby make and test sealing mechanism and reach reliable purpose, reduced and tested seal pressure.Adopted counter balance pocket, promptly balance the downward pressure that produces in the tubing string when discharging packer, again balance held in the packer course of work go up and press, and this packer has the gradually deblocking function, can gradually deblocking packers at different levels, reduced deblocking load.Thereby make and test sealing mechanism and reach reliable purpose, reduced and tested seal pressure.

Description of drawings:

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

1-top connection among the figure, 2-lower contact, 3-central tube, 4-deblocking housing; the last shell body of 5-, 6-seat envelope piston, 7-tests the envelope piston, 8-packing element axle; 9-lower casing body, 10-counter balance pocket, 11-counter balance pocket upper body, 12-dummy piston; the 13-upper pressing cap, 14-pin, 15-seat envelope pedestal, 16-deblocking lock dog; the 17-clip spring seat, the 18-jump ring, 19-protects lock dog; 20-protection lock dog back-up ring, 21-slideway, 22-oil jacket shading ring.

The specific embodiment:

The utility model is described in further detail below in conjunction with accompanying drawing:

By shown in Figure 1, this compression low pressure is tested sealed packer and is comprised packing element axle 8, test envelope piston 7, seat envelope piston 6, on, lower casing body (5,9), deblocking housing 4, central tube 3 reaches, lower contact (1,2), below the top connection 1,3 of last shell body 5 and central tubes have counter balance pocket 10, in the counter balance pocket 10, be connected with counter balance pocket upper body 11 on the central tube 3, upper body, counter balance pocket 10 inner equilibrium chamber is equipped with dummy piston 12 11 times, 13 of last shell body 5 and deblocking housing 4 and deblocking housing 4 and upper pressing caps are connected by pin 14, be connected with seat envelope pedestal 15 on deblocking housing 4 inner central tubes 3, be covered with clip spring seat 17 by deblocking lock dog 16 in the seat envelope pedestal 15, clip spring seat 17 inner groovies are built-in with the jump ring 18 of inner surface belt card tooth, 15 times stomidiums of seat envelope pedestal are built-in with the protection lock dog 19 that an end and deblocking housing 4 inner groovies touch mutually, the protection lock dog has the protection lock dog back-up ring 20 that links to each other with packing element axle 8 for 19 times, and there is the card tooth that matches with jump ring 18 packing element axle 8 upper ends; The pin of testing on the envelope piston 7 14 that lower contact 2 upper center tubes 3 and lower casing body are 9 places in seat envelope piston 6 slideways 21, tests the envelope piston 7 upper end oil jacket shading rings 22 outer springs that are with in the seat envelope piston 6.When going into the well the seat envelope, suppress by central tube 3, seat seals piston 6 and tests envelope piston 7 up together under pressure, it is up together to promote packing element axle 8 and oil jacket shading ring 22, compression packing element packing oil sets annular space, the card tooth of packing element axle 8 upper ends hangs over jump ring 18, guarantees that packing element still can keep compressive state after losing pressure.It is up to promote protection lock dog back-up ring 20 in the packing element axle 8 up processes, protection lock dog 19 losing locks.Finish back packing element axle 8 can not be up again the time when packing element compression, test active force that envelope piston 7 overcomes spring and continue uply, pin 14 carries out slideway conversion, after release is finished pressure and is removed, oil jacket shading ring 22 is rebounded under the active force of spring, and it is descending to promote to test envelope piston 7, abdicates and tests the envelope passage.At this moment can suppress from well head, liquid is flowed through and is tested the sealing of hole of testing of envelope passage in the middle of two groups of packing elements up and down and enter up and down in the middle of two groups of packing elements, if pressure does not fall, then proves packer sealing, otherwise the packer blow-by.Thereby need high pressure to cut off the problem of pin when solving the seat envelope and testing envelope, reach seat envelope under low pressure and test the purpose of envelope.When to trip out tubing string at present fishing tool drag for oil pipe, the upper lifting pipe post, top connection 1 tangles shell body 5, thereby it is up to tangle deblocking housing 4, subtract disconnected pin 14 up certain strokes after, deblocking lock dog 16 losing locks, under the elastic force of packing element, packing element axle 8 is descending, is being with jump ring 18 and clip spring seat 17 descending, deblocking is finished, and continues upper lifting pipe post deblocking next stage packer.Reach the purpose of deblocking, because of having adopted the counter balance pocket structure, by the dummy piston 12 in the counter balance pocket 10 both balance discharge the downward pressure that produces in the packer tubing string, again balance go up pressing of being held in the packer course of work, thereby stablize the packer external and internal pressure, the reliability of sealing mechanism is tested in assurance, can also gradually deblocking packer at different levels, reduced deblocking load.Test envelope reliability height so have, and have low, the easy to use characteristics of the seal pressure of testing.

Claims (1)

1, a kind of compression low pressure is tested sealed packer, comprise packing element axle (8), test envelope piston (7), seat envelope piston (6), on, lower casing body (5,9), deblocking housing (4), on central tube (3) reaches, lower contact (1,2), it is characterized in that: below top connection (1), between last shell body (5) and central tube (3) counter balance pocket (10) is arranged, in counter balance pocket (10), be connected with counter balance pocket upper body (11) on the central tube (3), in the counter balance pocket (10), be equipped with dummy piston (12) below the counter balance pocket upper body (11), be connected by pin (14) between last shell body (5) and deblocking housing (4) and deblocking housing (4) and upper pressing cap (13), be connected with seat envelope pedestal (15) on deblocking housing (4) inner central tube (3), be covered with clip spring seat (17) by deblocking lock dog (16) in the seat envelope pedestal (15), clip spring seat (17) inner groovy is built-in with the jump ring (18) of inner surface belt card tooth, seat envelope pedestal (15) stomidium down is built-in with the protection lock dog (19) that an end and deblocking housing (4) inner groovy touch mutually, under the protection lock dog (19) protection lock dog (19) back-up ring (20) that links to each other with packing element axle (8) is arranged, there is the card tooth that matches with jump ring (18) packing element axle (8) upper end; The pin of testing on the envelope piston (7) (14) between lower contact (2) upper center tube (3) and lower casing body (9) places in seat envelope piston (6) slideway (21), tests the outer spring that is with of envelope piston (7) upper end oil jacket shading ring (22) in the seat envelope piston (6).