CN1858398A

CN1858398A - Back-off packer

Info

Publication number: CN1858398A
Application number: CN 200610044370
Authority: CN
Inventors: 宁艺生; 仇光录; 杨洪辉; 王强
Original assignee: XIANGSHENG INDUSTRY AND TRADE Co Ltd DONGYING
Current assignee: XIANGSHENG INDUSTRY AND TRADE Co Ltd DONGYING
Priority date: 2006-05-25
Filing date: 2006-05-25
Publication date: 2006-11-08

Abstract

A kind of back-off packer has pressurized oil pipe and rubber tube with expanded ring space. It has check valve to maintain the pressure inside the rubber tube unchanged for anchoring the packer onto the casing, and pressure cut ring for disposing pipe column. During the next workover, the upper inner pipe is fished, the unblocking ring is cut off, the thimble is made to ascend to push out the check valve for releasing pressure inside the rubber tube, contracting the rubber tube, unlocking the packer and fishing out the pipe column. The expanded rubber tube assembly contacts closely to the inner wall of the casing to seal the ring space firmly. The present invention has reliable backing off and unblocking.

Description

Back-off packer

One, technical field

The present invention is the laminated distributor under well oil tool of oil field oil recovery usefulness, particularly a kind of back-off packer.

Two, background technology

Implement layering card water blockoff oil recovery technique, envelope is fallen high aquifer, is the effective way that the control well water rises.Layering card water blockoff will adopt packer, existing packer kind is more, packer in every mouthful of well must adopt the packer of one-level band slips, play support tube column, as Y221, Y211, Y445 etc. all is slips type packer, and slips type packer set makes the tubing string that supports that sleeve pipe generation plastic strain could be firm by the high rigidity slips on the packer.Therefore, the packer that can satisfy oil-separating layer at present damages sleeve pipe easily, but also exists easy inefficacy, downslide, supporting capacity low, defectives such as the low and deblocking difficulty of construction success rate.It is to suppress the seat envelope after bringing it into the oil reservoir position by oil pipe that there is one type packer at the scene, and then oil pipe separated with packer, realize that this process scene is called and give up, the packer that is adopted is the Y445 packer, this packer also is the packer of band slips, the same problems such as damaging sleeve pipe that exists.

Three, summary of the invention

The objective of the invention is to design a kind of back-off packer, do not damage sleeve pipe, good airproof performance, it is reliable with deblocking to give up.

The object of the present invention is achieved like this: top connection is cut ring seat top and is connected with giving up, pipe is in top connection in going up, giving up, cutting gives up between ring seat and the last interior pipe cuts annulate shaft, give up and cut ring set and be contained in to give up and cut on the annulate shaft, the outward flange of cutting ring of giving up is cut outside the endoporus of ring seat giving up, give up and cut the ring seat bottom and connect with packing element assembly top, packing element assembly bottom is the single current valve body, ball-and-seat is installed in the single current valve body, thimble, the single current valve body lower portion is cut ring set top with deblocking and is connected, pipe top connects with inside on the packing element assembly down, the packing element assembly, the single current valve body, deblocking cut annulate shaft be sleeved on down in outside the pipe, deblocking cuts that annulate shaft is managed and deblocking is cut between the ring set in down, deblocking is cut ring set and is contained in deblocking and cuts on the annulate shaft, the pipe bottom connects with the retaining joint down, and deblocking is cut the ring set bottom and connected with lower contact.Coupling head is arranged at single current valve body top, and constant pressure arrangement is installed in the coupling head lower surface, and coupling head is provided with anchor watt.Give up and cut ring, deblocking is cut ring and can be made into the pin shape.

The invention has the beneficial effects as follows: suppress be honored as a queen packing element assembly expansion of seat, be close to and seal up oil casing annular space on the internal surface of sleeve pipe, enough big anchorage force is arranged between packing element assembly and the sleeve pipe, make between packer and the sleeve pipe and can not produce relative motion, therefore seat secures solid, because the packing element assembly does not have slips, so do not damage sleeve pipe, good airproof performance.Under the effect of ball-and-seat, after not suppressing, packing element assembly chamber pressure remains unchanged, and packing element can not shrink, and packer is anchored on the sleeve pipe all the time.Give up and deblocking is realized by cutting off ring, the shearing force size can be determined as requested, so it is reliable with deblocking to give up.

Four, description of drawings

Accompanying drawing is the assembling drawing of the embodiment of the invention.

Five, the specific embodiment

Below in conjunction with accompanying drawing embodiments of the invention are described.

Among the figure: the 1st, top connection, the 2nd, pipe in going up, the 3rd, give up and cut ring, the 4th, give up and cut annulate shaft, the 5th, give up and cut ring seat, the 6th, the packing element assembly, the 7th, coupling head, the 8th, the anchor eaves tile connects, and the 9th, interior down pipe, the 10th, constant pressure arrangement, the 11st, ball-and-seat, the 12nd, thimble, the 13rd, the single current valve body, the 14th, deblocking is cut annulate shaft, and the 15th, deblocking is cut ring, the 16th, deblocking is cut ring set, and the 17th, retaining connects, and the 18th, lower contact.Top connection (1) is cut ring seat 5 tops and is connected with giving up, pipe 2 is in top connection 1 in going up, giving up, cutting gives up between ring seat 5 and the last interior pipe 2 cuts annulate shaft 4, give up and cut ring 3 and be sleeved on to give up and cut on the annulate shaft 4, give up and cut ring 3 outward flange and cut outside the endoporus of ring seat 5 giving up, give up and cut ring seat 5 bottoms and connect with packing element assembly 6 tops, packing element assembly 6 bottoms connect with coupling head 7 tops, constant pressure arrangement 10 is installed in coupling head 7 bottoms, coupling head 7 bottoms connect with single current valve body 13 tops, ball-and-seat 11 is installed in the single current valve body 13, thimble 12, single current valve body 13 bottoms are cut ring set 16 tops with deblocking and are connected, pipe 9 tops connect with inside on the packing element assembly 6 down, packing element assembly 6, coupling head 7, single current valve body 13, deblocking cut annulate shaft 14 be sleeved on down in outside the pipe 9, deblocking is cut annulate shaft 14 pipe 9 and deblocking in down and is cut between the ring set 16, deblocking is cut and is encircled 15 and be sleeved on deblocking and cut on the annulate shaft 14, pipe 9 bottoms connect with retaining joint 17 down, and deblocking is cut ring set 16 bottoms and connected with lower contact 18.Coupling head 7 is provided with anchor watts 8.Give up and cut ring 3, deblocking is cut ring and 15 can be made into the pin shape.

The present invention is with the design attitude in the oil well casing under the tubing string, when going into the well under the effect of constant pressure arrangement 10, the packing element chamber pressure is low, packing element is not expanded, after projected depth, suppress in oil pipe down, the pressure warp pressure transmission hole of interior pipe 9 down enters, through ball-and-seat 11, the edge outer wall of interior pipe 9 down reaches in the packing element assembly 6, makes the packing element expansion, seals up oil casing annular space, and be anchored on the sleeve pipe, after not suppressing, under the effect of ball-and-seat, packing element assembly chamber pressure remains unchanged, packing element can not shrink, and packer is anchored on the sleeve pipe all the time.In the time of packer set and grappling, pressure acts on to give up cuts the upper surface of annulate shaft 4, and cutting off gives up cuts ring 3, and the realization tubing string is given up.When workover treatment next time need be pulled out, pipe 2 in following fishing string drags for, pipe 9 in driving down, retaining joint 17 are up, cut off deblocking and cut ring 15, deblocking is cut annulate shaft 14, thimble 12 in company with up, and thimble 12 backs down the valve ball of ball-and-seat 11, pressure in the packing element discharges, packing element shrinks, the packer deblocking, and tubing string can be pulled out.

Claims

1, a kind of back-off packer, packing element assembly (6) is arranged, it is characterized in that: top connection (1) is cut ring seat (5) top and is connected with giving up, pipe (2) is in top connection (1) in going up, giving up, cutting gives up between ring seat (5) and the last interior pipe (2) cuts annulate shaft (4), give up and cut ring (3) and be sleeved on to give up and cut on the annulate shaft (4), the outward flange of cutting ring (3) of giving up is cut outside the endoporus of ring seat (5) giving up, give up and cut ring seat (5) bottom and connect with packing element assembly (6) top, packing element assembly (6) bottom is single current valve body (13), ball-and-seat (11) is installed in the single current valve body (13), thimble (12), single current valve body (13) bottom is cut ring set (16) top with deblocking and is connected, the inner connection gone up with packing element assembly (6) in pipe (9) top down, packing element assembly (6), single current valve body (13), deblocking is cut annulate shaft (14) and is sleeved on down outside the interior pipe (9), deblocking cuts that annulate shaft (14) is managed (9) in down and deblocking is cut between the ring set (16), deblocking is cut ring (15) and is sleeved on deblocking and cuts on the annulate shaft (14), pipe (9) bottom connects with retaining joint (17) down, and deblocking is cut ring set (16) bottom and connected with lower contact (18).

2, back-off packer according to claim 1 is characterized in that: coupling head (7) is arranged at single current valve body (13) top, and constant pressure arrangement (10) is installed in coupling head (7) lower surface, and coupling head (7) is provided with anchor watt (8).

3, back-off packer according to claim 1 is characterized in that: give up and cut ring (3), deblocking is cut ring (15) and can be made into the pin shape.