CN201092846Y

CN201092846Y - Casing deformation well bridge plug

Info

Publication number: CN201092846Y
Application number: CNU2007200139626U
Authority: CN
Inventors: 刘春雨; 杨福军; 胡友好
Original assignee: FUXIN CHIYU PETROLEUM MACHINERY Co Ltd
Current assignee: FUXIN CHIYU PETROLEUM MACHINERY Co Ltd
Priority date: 2007-08-24
Filing date: 2007-08-24
Publication date: 2008-07-30
Anticipated expiration: 2017-08-24

Abstract

The utility model belongs to an oil-steam field underground using tool, in particular relates to a bottom water plugging and layer-selected fracturing casing deformation well bridge plug, which comprises an upper joint (1), a stretching force sleeve (2), a connecting sleeve (3), a salvaged joint (8), a slips (18), a slip sleeve (20), a slip spring (9), an upper cone (11), and a lower cone (21), wherein the connecting sleeve (3) is articulated with the stretching force sleeve (2) and is locked by a closing piece (4), accessory pistons (5) are mounted on the upper joint (1) and in the ring cavity of a main piston (7), the lower end of the main piston (7) and the upper end screw threads of the upper cone (11) are connected with a packing rubber (10) and combined into one piece by sulfurating, the outside of the salvaged joint (8) is articulated with a center tube (12), the outside of the lower end is fixedly connected with a core tube (14) by a deblocking shear pin, and inner-side screw threads of the lower cone (21) are connected with the core tube (14). The casing deformation well bridge plug has the advantages that the ability of anti-resistance is strong, the ability of bearing work pressure is strong, the upper end surface of the center tube is contacted with the piston when movement of the piston is limited and the shoulder of the piston is lifted during packing, and packer rubber is compressed when movement of the packer rubber is limited.

Description

The casing deformation well bridging plug

Technical field

The utility model belongs to down-hole, oily vapour field instrument, particularly a kind of bottom water plugging and the casing deformation well bridging plug that selects lamination to split.

Background technology

At present, the used casing deformation well bridging plug in home and abroad structurally is designed to connect lock tube and stays after putting aside in the well, and it is long that instrument is salvaged top of fish like this, causes top of fish sand to bury easily, is difficult for salvaging; Pulling force cover and central tube be by the lock dog interlocking, and the spacing packing element of spacing ring overcomes soft or hard resistance ability, bears that operating pressure is poor, application life is short, deblocking is difficult in the process of going into the well.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned technical deficiency, provide a kind of resist resistance, bearing capacity by force, not Ka Jing, be easy to the casing deformation well bridging plug of deblocking.

The technical scheme that the utility model technical solution problem adopts is: the casing deformation well bridging plug is by top connection, the pulling force cover, adapter sleeve, fishing head, slips, the slips cover, the slips spring, upper cone, lower cone is formed, be characterized in that adapter sleeve articulates pulling force cover and locks with lock dog, in the annular chamber of top connection and main piston auxiliary piston is housed, auxiliary piston is fixedlyed connected with pawl spring by starting shear pin, fixedly connected with central tube with putting shear pin aside in pulling force cover lower end, packing element and sulfuration composition one are threaded on main piston lower end and the upper cone, the fishing head outside articulates central tube, fixedlyed connected with the core pipe by the deblocking shear pin in the outside, lower end, the central tube upper surface spacing compression packing element of main piston shoulder, lower cone inside thread connection-core pipe, steel ball is housed in the middle of the core pipe, the steel ball crimp spring is also pushed down with pressure cap, core pipe lower end Built-in lock spring two, mandrel is fixedlyed connected with the effective seat of core envelope shear pin, articulate slips between core pipe upper cone lower end, the outside and the lower cone upper end, in the middle of the slips slips spring is housed, the slips both sides articulate the slips cover.

The beneficial effects of the utility model are: one, and anti-resistance ability is strong, and adapter sleeve and pulling force cover articulate simultaneously and are locked by lock dog, and main piston upper end pawl spring lock connects no improper putting aside; Its two, one is formed in main piston, packing element, upper cone sulfuration, it is strong to bear operating pressure; Its three, when envelope seat the central tube upper surface contact spacing compression packing element with the spacing half the circumference of the sleeve where it joins the shoulder of piston.

Description of drawings

Specify with embodiment below in conjunction with accompanying drawing.

Fig. 1 shows casing deformation well bridging plug structure chart.

Among the figure, the 1-top connection; 2-pulling force cover; The 3-adapter sleeve; The 4-lock dog; The 5-auxiliary piston; The 6-pawl spring; The 7-main piston; The 8-fishing head; 9-snap one; The 10-packing element; The 11-upper cone; The 12-central tube; 13-deblocking shear pin; 14-core pipe; The 15-pressure cap; The 16-spring; The 17-steel ball; The 18-slips; 9-slips spring; 20-slips cover; The 21-lower cone; 22-snap two; 23-seat envelope shear pin; The 24-mandrel; 25-puts shear pin aside; 26-starts shear pin;

The specific embodiment

With reference to accompanying drawing 1, connect adapter sleeve 3, lower end butt joint main piston 7 in the casing deformation well bridging plug top connection 1, adapter sleeve 3 articulates pulling force cover 2 simultaneously with lock dog 4 lockings, dress auxiliary piston 5 in the toroidal cavity of top connection 1 and main piston 7, and auxiliary piston 5 is affixed with pawl spring 6 by starting shear pin 26.It is affixed with central tube 12 by putting shear pin 25 aside that pulling force overlaps 2 lower ends, fishing head 8 outsides articulate central tube 12, the outside, lower end is affixed by deblocking shear pin 13 and core pipe 14, the central tube 12 upper surfaces spacing compression packing element 10 of main piston 7 shoulders, outside dress snap 9 articulates with main piston 7, main piston 7 lower ends and the upper cone 11 upper ends packing element 10 that is threaded, the upper cone 11 and lower cone 21 outsides articulate slips cover 20, slips cover 20 crimping slips 18, slips spring 19. lower cones 21 inside thread connection-core pipes 14 are housed in the middle of the slips 18, steel ball 17 is housed in the middle of the core pipe 14, steel ball 17 crimp springs 16 are also pushed down with pressure cap 15, core pipe 14 lower end Built-in lock springs 2 22, the mandrel 24 and core pipe 14 outsides are affixed with seat envelope shear pin 23.

The casing deformation well bridging plug course of work: top connection 1 connect tubing string go into the well arrive desired location after, connecting line, inject highly pressurised liquid, liquid stream promotion auxiliary piston 5 is cut off to start on shear pin 26 backs and is moved, lock dog 4 and adapter sleeve 3 releases are pawl spring 6 and main piston 7 releases simultaneously, liquid stream promotes main piston 7 and moves down compression packing element 10 and push away central tube 12, snap 1, core pipe 14, upper cone 11 moves down, promotion slips 18 moves radially and is anchored on the well inwall, liquid stream backs down steel ball 17 and enters packing element 10 inside its packing element is radially increased, main piston 7 extruding packing elements 10 make its diameter increase be close to well inwall upper sealing ring cover space simultaneously, when flow stream pressure reaches seal pressure, mandrel 24 moves down cuts off an envelope shear pin 23 promotion snaps 2 22, move in oil pipe and the top connection 1, break and put shear pin 25 aside.Send the envelope instrument: top connection 1, pulling force cover 2, adapter sleeve 3, lock dog 4, auxiliary piston 5 and pawl spring 6 propose outside the well, half the circumference of the sleeve where it joins the shoulder dieback in central tube 12 upper surfaces and the main piston 7 during work, packing element 10 does not recompress, when the cycle of finishing the work is pulled the casing deformation well bridging plug out in well, in well, be lowered to special-purpose fishing tool and grab lock fishing head 8, the upper lifting pipe post is cut off deblocking shear pin 13, continue upper lifting pipe post fishing head 8 and articulate central tube 12, moving on the central tube 12 to promote to move on the piston 7 makes packing element 10 remove the squeezed state deblocking, articulate upper cone 11 successively, core pipe 14, slips cover 20, lower cone 21, slips 18 is radially withdrawn and is removed grappling, on carry tubing string the casing deformation well bridging plug proposed outside the well.

The casing deformation well bridging plug is applicable to oily vapour well bottom water plugging and selects lamination to split.

Claims

1. casing deformation well bridging plug, by top connection (1), pulling force cover (2), adapter sleeve (3), fishing head (8), slips (18), slips cover (20), slips spring (9), upper cone (11), lower cone (21) is formed, it is characterized in that adapter sleeve (3) articulates pulling force cover (2) and uses lock dog (4) locking, in the annular chamber of top connection (1) and main piston (7) auxiliary piston (5) is housed, auxiliary piston (5) is fixedlyed connected with pawl spring (6) by starting shear pin (26), fixedly connected with central tube (12) with putting shear pin (25) aside in pulling force cover (2) lower end, packing element (10) and sulfuration composition one are threaded on main piston (7) lower end and the upper cone (11), fishing head (8) outside articulates central tube (12), fixedlyed connected with core pipe (14) by deblocking shear pin (13) in the outside, lower end, central tube (12) upper surface main piston (7) the spacing compression packing element of shoulder (10), lower cone (21) inside thread connection-core pipe (14), steel ball (17) is housed in the middle of the core pipe (14), steel ball (17) crimp spring (16) is also pushed down with pressure cap (15), core pipe (14) lower end Built-in lock spring two (22), mandrel (24) is fixedlyed connected with seat envelope shear pin (23) with core pipe (14), articulate slips (18) between core pipe (14) upper cone (11) lower end, the outside and lower cone (21) upper end, in the middle of the slips (18) slips spring (9) is housed, slips (18) both sides articulate slips cover (20).