CN201857930U

CN201857930U - Well cleanup packer capable of realizing step-by-step unpacking

Info

Publication number: CN201857930U
Application number: CN2010206113833U
Authority: CN
Inventors: 任龙; 刘方雁; 代兴斌; 王科; 韩振国
Original assignee: Daqing Oilfield Co Ltd
Current assignee: Daqing Oilfield Co Ltd
Priority date: 2010-11-18
Filing date: 2010-11-18
Publication date: 2011-06-08
Anticipated expiration: 2020-11-18

Abstract

The utility model relates to a well cleanup packer capable of realizing step-by-step unpacking, which is used for water injection wells in oilfield oil extraction fields and mainly resolves the problem that after multiple stages of packers are arranged in a water well, the packers cannot be unpacked step by step smoothly, so that a tubular column of the water well cannot be pulled. The well cleanup packer is characterized in that an upper joint is successively connected with an upper jacket, a lower jacket and upper sheath, a lower joint is connected with a connecting jacket, and the upper end of the connecting jacket is connected with a lower sheath via a releasing pin. The well cleanup packer has the advantages that multiple stages of packers can be arranged in a water well, can realize smooth step-by-step unpacking, and avoids the problems that the packer is in unsuccessful unpacking or abnormal unpacking and then a tubular column of the water well cannot be pulled due to the fact that multiple stages of packer rubber barrels for simultaneously rubbing with the wall of a casing in a contact manner.

Description

Step-by-step releasable flushing packer

Technical field

The utility model relates to the used packer in oil recovery field, a kind of oil field, a kind of specifically step-by-step releasable flushing packer.

Background technology

At present, oil field overall application compression packer carries out seperated layer water injection, and well layering sealing effectiveness is significantly improved, and brings up to present more than 95% by 80%.In compression packer commonly used, on generally being, the lower contact interlock, deblocking pin in the packer will be born top-down difference force, in order to prevent that too high or tubing string wriggling causes the packer deblocking to the compression Water well packer because of last pressure in the course of the work, require the deblocking power of deblocking pin to be necessary for more than the 80KN, the way that solves in the scene is to strengthen the diameter of deblocking pin, can make the sealing mechanism of separating of packer can't deblocking so again, to cause the deblocking failure mechanisms, on packer, the lower contact interlock, the frictional force of packing element can't discharge, and deblocking can only be by the packing element release pressure deblocking of grinding away by force.If yet the frictional force between packing element and the sleeve pipe greater than 30t, routine work team can't construct, and cause tubing string to pull out motionless termination.At the oil field late high water content period, oil well multilayer water breakthrough, the oil-water-layer cross-distribution, interlayer difference is increasing, old liberated area exploitation existing water injection well layering hop count by average 3-4 section, progressively increase to the 6-7 section, obviously, packer not deblocking or undesired deblocking can to cause extremely many well tubing strings to pull out motionless, produce to the oil field and cause great loss.

Summary of the invention

After going into multi-stage compression formula packer in the water down-hole, energy is gradually deblocking smoothly, and the utility model provides a kind of step-by-step releasable flushing packer.This packer can be avoided multiple-string packer packing element while and casing wall contact friction, causes packer not deblocking or undesired deblocking, causes the well tubing string to pull out motionless phenomenon.

The technical solution of the utility model is: a kind of step-by-step releasable flushing packer, mainly comprise top connection, lower contact, inner central tube, exterior central tube, last overcoat, following overcoat, connect overcoat, the packing element combination, last well-flushing piston, following well-flushing piston, last release plunger, following release plunger, upper jacket, lower jacket, jump ring, jump ring is hung, last dummy piston reaches dummy piston down, wherein, the outer wall of described top connection successively with last overcoat, following overcoat and upper jacket connect, the outer wall of lower contact be connected overcoat and connect, connecting outer casing inner wall cooperates with the jump ring extension, be equipped with down release plunger between lower end that jump ring is hung and lower contact, the upper end that connects overcoat is connected with lower jacket by release pin, is equipped with the packing element combination between upper jacket and lower jacket; The inner wall sleeve of packing element combination is on exterior central tube, and the lower end of exterior central tube cooperates with the following shaft shoulder of inner central tube outer wall, the last shaft shoulder of the upper end of exterior central tube and inner central tube outer wall is located by connecting, the upper end of inner central tube and the endoporus of top connection are slidingly matched, and with last overcoat, down overcoat and exterior central tube form ring cavity, the lower end of inner central tube is connected with lower contact and with jump ring extension formation ring cavity down; Described top of going up ring cavity is equipped with dummy piston, last dummy piston is fixed on the inner central tube, and with last outer inner room by the deblocking dowel fixes, the middle part of last ring cavity is equipped with the well-flushing piston from top to bottom successively, well-flushing piston, fixed piston reach dummy piston down down, wherein going up the well-flushing piston is connected with following well-flushing piston, following dummy piston is fixedlyed connected with exterior central tube, last well-flushing piston is built-in with the skeleton packing with following well-flushing annular groove that piston forms, and the outer shaft shoulder of fixed piston is stuck in overcoat and forms in the annular groove with following overcoat; Its top is equipped with release plunger in the described ring cavity down, and the inwall of last release plunger is fixed on the inner central tube, and the annular groove of last release plunger bottom is stuck on the jump ring, and jump ring is fixed on jump ring and hangs up.

Above-mentioned packing element is combined as packing element and spacer ring alternately, and the packing element at two ends withstands on respectively in upper jacket and the lower jacket contact up and down.

The utility model compared with prior art because top connection is connected overcoat and last dummy piston on the deblocking dowel fixes by overcoat up and down with upper jacket; Lower contact is with inner central tube and be connected the overcoat connection, connecting overcoat is connected by release pin with lower jacket, dummy piston is fixed on the inner central tube, inner central tube and top connection are slidingly connected, during this packer of upper lifting pipe post deblocking, the deblocking pin is cut off in the pulling top connection, and overcoat and upper jacket are followed and moved up and down, and the parts that are connected with lower contact are motionless, thereby draw back the distance between the lower jacket, it is spacing that packing element is lost, top-down gradually deblocking, thereby solved because of on the packer, the lower contact servo-actuated, make the multiple-string packer packing element all with the casing wall contact friction, cause packer not deblocking or undesired deblocking, cause the well tubing string to pull out motionless problem.

Description of drawings

Fig. 1 is a structural representation of the present utility model, and A is the epimere of B among the figure;

1-top connection among the figure, the last overcoat of 2-, the last dummy piston of 3-, 4-deblocking pin, 5-inner central tube, the last well-flushing piston of 6-, well-flushing piston under the 7-, 8-skeleton packing, 9-fixed piston, dummy piston under the 10-, overcoat under the 11-, 12-upper jacket, 13-spacer ring, the combination of 14-packing element, 15-exterior central tube, 16-lower jacket, 17-release pin, the last release plunger of 18-, 19-connects overcoat, the 20-jump ring, the 21-jump ring is hung, release plunger under the 22-, 23-lower contact, the last ring cavity of 24-, ring cavity under the 25-.

The specific embodiment

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

By shown in Figure 1, this step-by-step releasable flushing packer mainly comprises top connection 1, lower contact 23, inner central tube 5, exterior central tube 15, last overcoat 2, following overcoat 11, connect overcoat 19, packing element combination 14, last well-flushing piston 6, following well-flushing piston 7, last release plunger 18, following release plunger 22, upper jacket 12, lower jacket 16, jump ring 20, jump ring hangs 21, last dummy piston 3 reaches dummy piston 10 down, wherein, the outer wall of top connection 1 successively with last overcoat 2, following overcoat 11 and upper jacket 12 are threaded, the outer wall of lower contact 23 be connected overcoat 19 and be threaded, connecting overcoat 19 inwalls cooperates with the bottom of jump ring extension 21, the lower end and 23 of the lower contacts of jump ring extension 21 are equipped with down release plunger 22, the upper end that connects overcoat 19 is threaded with release pin 17, and an end of release pin 17 is through in the groove on lower jacket 16 walls; Be equipped with packing element combination 14 between the upper surface of the lower surface of upper jacket 12 and lower jacket 16; The inner wall sleeve of packing element combination 14 is on exterior central tube 15, the lower end of exterior central tube 15 cooperates with the following shaft shoulder on inner central tube 5 outer walls, last shaft shoulder location on inner central tube 5 outer walls of the upper end step of exterior central tube 15, and be threaded with it, form the flushing fluid passage between the inwall of the outer wall of inner central tube 5 and exterior central tube 15; The endoporus of the upper end of inner central tube 5 and top connection 1 is slidingly matched, and forms upward ring cavity 24 with last overcoat 2, following overcoat 11 and exterior central tube 15, and the lower end of inner central tube 5 is connected with the inner hole thread of lower contact 23, and hangs ring cavity 25 under 21 formation with jump ring; Described top of going up ring cavity 24 is equipped with dummy piston 3, last dummy piston 3 screw threads are fixed on the inner central tube 5, on the outer wall of last dummy piston 3 groove is arranged, deblocking pin 4 one ends that are connected with the sidewall thread of last overcoat 2 are positioned at the groove on the outer wall of dummy piston 3; The middle part of last ring cavity 24 is equipped with well-flushing piston 6 from top to bottom successively, well-flushing piston 7, fixed piston 9 reach dummy piston 10 down down, wherein, last well-flushing piston 6 is threaded with following well-flushing piston 7, following dummy piston 10 is threaded with exterior central tube 15, formed annular groove is built-in with skeleton packing 8 between the lower surface of last well-flushing piston 6 and following well-flushing piston 7 interior steps, and the outer shaft shoulder of fixed piston 9 is stuck in overcoat 2 and the following overcoat 11 formed annular grooves; Described ring cavity 25 tops down are equipped with release plunger 18, and the upper inside wall screw thread of last release plunger 18 is fixed on the inner central tube 5, and last release plunger 18 bottoms have annular groove, and annular groove is stuck on the jump ring 20, and jump ring 20 is fixed on jump ring and hangs on 21.

Above-mentioned packing element combination 14 be packing element and spacer ring 13 alternately, two ends tin withstands on respectively on upper jacket 12 and the lower jacket 16 up and down.

In order to improve the sealing performance of packer, overcoat on this packer 2 and top connection 1, on dummy piston 3 and on 6 in well-flushing piston, 11 in following dummy piston 10 and following overcoat, inner central tube 5 and top connection 1, go up dummy piston 3, go up well-flushing piston 6, go up

release plunger

18,22 of release plunger down, connection overcoat 19 and inner central tube 5 and last release plunger 18, following 22 of release plunger all are equipped with sealing ring, in addition, in 7 in last well-flushing piston 6 and following well-flushing piston, fixed piston 9 and

dummy piston

10 and 11 in following overcoat all are equipped with sealing ring down.

When setting, when the environment stress of packer present position reaches 14-16Mpa, it is up that following release plunger 22 promotes lower jacket 16, compression packer packing element combination 14, finish and set, jump ring 20 is locked on the jump ring extension 21 simultaneously, makes when deblocking pin 4 is broken that lower contact 23 and connector are with moving in the top connection 1; If when setting, packer is inside and outside to produce pressure reduction, thereby dummy piston 3 can produce the equilibrant force lifting inner central tube 5 protection deblocking pins 4 of about 60KN.

During duty, following dummy piston 10 can produce equilibrant force lifting inner central tube 5 and exterior central tube 15, thus protection deblocking pin 4.

During well-flushing, release water injection pressure in the oil pipe, at sleeve pipe pressure water injection well-flushing in the well, well-flushing water is entered by the feed liquor slot of last overcoat 2, well-flushing piston 6 is up in the promotion, the sealing of well-flushing piston 6 and inner central tube 5 in the releasing, well-flushing water enters the passage of 15 of inner central tube 5 and exterior central tubes, since the hole of the radial direction through hole on lower jacket 16 top wall on packing element compression back and exterior central tube 15 on, form the well-flushing passage until subordinate's packer, return ground by bottom ball-and-seat, oil pipe central passage at last.

During the deblocking multiple-string packer, the upper lifting pipe post, at first spur the top connection 1 of upper level packer, upper lifting force acts on the deblocking pin 4 by top connection 1 and last overcoat 2, if deblocking pin 4 adds the resistance to tension of the frictional force of packing element combination 14 and casing wall less than deblocking pin 4 with lower tubular column weight, tubing string can be tripped out well head under the pulling that working rig allows, if deblocking pin 4 adds the resistance to tension of the frictional force of packing element combination 14 and casing wall above deblocking pin 4 with lower tubular column weight, deblocking pin 4 is broken, top connection drives overcoat 2 successively, following overcoat 11, move in upper jacket 12 servo-actuateds, and the parts inner central tube 5 that is connected successively with lower contact 23, lower jacket 16, connecting overcoat 19 throws off, thereby draw back the distance between upper jacket 12 and the lower jacket 16, make the packing element combination on the packer lose spacing, the packing element combination 14 of upper level packer is disengaged spacing, upper level packer deblocking; And the like, the second level, third level gradually deblocking, movable repeatedly tubing string with all packer deblockings, thereby is successfully realized gradually deblocking.

Claims

1. step-by-step releasable flushing packer, mainly comprise top connection (1), lower contact (23), inner central tube (5), exterior central tube (15), last overcoat (2), following overcoat (11), connect overcoat (19), packing element combination (14), last well-flushing piston (6), following well-flushing piston (7), last release plunger (18), following release plunger (22), upper jacket (12), lower jacket (16), jump ring (20), jump ring is hung (21), last dummy piston (3) reaches dummy piston (10) down, it is characterized in that: the outer wall of top connection (1) successively with last overcoat (2), following overcoat (11) and upper jacket (12) connect, the outer wall of lower contact (23) be connected overcoat (19) and connect, connect overcoat (19) inwall and cooperate, be equipped with down release plunger (22) between the lower end of jump ring extension (21) and lower contact (23) with jump ring extension (21); The upper end that connects overcoat (19) is connected with lower jacket (16) by release pin (17), is equipped with packing element combination (14) between upper jacket (12) and lower jacket (16); The inner wall sleeve of packing element combination (14) is on exterior central tube (15), and the lower end of exterior central tube (15) cooperates with the following shaft shoulder of inner central tube (5) outer wall, the last shaft shoulder of the upper end of exterior central tube (15) and inner central tube (5) outer wall is located by connecting, the endoporus of the upper end of inner central tube (5) and top connection (1) is slidingly matched, and with last overcoat (2), down ring cavity (24) is gone up in overcoat (11) and exterior central tube (15) formations, the lower end of inner central tube (5) be connected with lower contact (23) and with jump ring extension (21) formation ring cavity (25) down; Described top of going up ring cavity (24) is equipped with dummy piston (3), last dummy piston (3) is fixed on the inner central tube (5), and it is fixing between last overcoat (2) by deblocking pin (4), the middle part of last ring cavity (24) is equipped with well-flushing piston (6) from top to bottom successively, following well-flushing piston (7), fixed piston (9) reaches dummy piston (10) down, wherein going up well-flushing piston (6) is connected with following well-flushing piston (7), following dummy piston (10) is fixedlyed connected with exterior central tube (15), last well-flushing piston (6) is built-in with skeleton packing (8) with following well-flushing piston (7) annular groove that forms, and the outer shaft shoulder of fixed piston (9) is stuck in overcoat (2) and forms in the annular groove with following overcoat (11); Described ring cavity (25) internal upper part down is equipped with release plunger (18), the inwall of last release plunger (18) is fixed on the inner central tube (5), the annular groove of last release plunger (18) bottom is stuck on the jump ring (20), and jump ring (20) is fixed on jump ring and hangs on (21).

2. step-by-step releasable flushing packer according to claim 1 is characterized in that: above-mentioned packing element combination (14) for packing element and spacer ring (13) alternately, the packing element at two ends withstands on respectively on upper jacket (12) and the lower jacket (16) up and down.