CN2833099Y

CN2833099Y - High-pressure drillable bridge plug

Info

Publication number: CN2833099Y
Application number: CN 200520091977
Authority: CN
Inventors: 隋德红; 薛立平; 刘长志; 李文忠
Original assignee: FUXIN CITY PETROLEUM TOOL FACTORY
Current assignee: FUXIN CITY PETROLEUM TOOL FACTORY
Priority date: 2005-07-26
Filing date: 2005-07-26
Publication date: 2006-11-01
Anticipated expiration: 2015-07-26

Abstract

The utility model provides a high-pressure drillable bridge plug. A lock block 2 is locked and pressed by an upper joint 1 and an auxiliary piston 4 in a ring-shaped cavity connected with a central pipe 6 in a screwed connection mode; a main piston 5 is locked and connected by an auxiliary piston shear pin 3, the main piston 5 is locked and connected with an upper conical body 9 in a screwed connection mode, the upper conical body 9 and a slip 12 are locked and connected with a mandrel 10 in a screwed connection mode, and the slip 12 is fixed by a slip shear pin 11; the upper end of a pull rod 7 is movably hinged with the central pipe 6, and the lower end is connected with the mandrel 10 in a screwed connection mode; a lower conical body 13 fixed by a lower conical body shear pin 14 is hung and connected with a shoulder of the mandrel 10; a protecting cover 15 is extruded by the upper and lower ends of a rubber cylinder 16 connected below the lower conical body 13, and a lower press ring 17 connected below the rubber cylinder 16 is connected with the mandrel 10 in a screw connection mode; a locking spring 8 which is locked and connected with the mandrel 10 is arranged in a groove at the inner side of the upper conical body 9; the outer surface of the slip 12 is provided with ring belt teeth, and the inner surface is provided with threads. The high-pressure drillable bridge plug has the advantages of short unsealing distance of drilling and milling and high pressure difference resistance, which is suitable for selected layer fracture for oil wells, plugging bottom water and manufacturing cement holding plugs of artificial well bottom.

Description

High pressure can bore bridging plug

Affiliated technical field the utility model belongs to a kind of well recovery downhole tool, and particularly a kind of high pressure that is used for underground work can bore bridging plug.

Background technology is present, and the bridging plug that use in the oil field, home and abroad has salvagable and drillable two big series.Salvage difficulty when the retrievable bridge plug life cycle is long; The drillable bridging plug is because project organization is unreasonable, and slips is positioned at that drill with ferrule mills distance on the packing element; Packing element does not have guard shield, the packing element inboard not directly and stem seal, seat is honored as a queen does not have a plurality of snaps and mandrel to lock in the upper cone inboard groove, the resistance to compression difference is low.

The summary of the invention the purpose of this utility model is to overcome above technical deficiency, provides a kind of brill to mill deblocking and can bore bridging plug apart from the high pressure of weak point, anti-High Pressure Difference.

The utility model task is, a kind of high pressure can bore bridging plug, the auxiliary piston lock is pressed lock dog in the toroidal cavity that top connection is threaded with central tube, by auxiliary piston shear pin interlocking main piston, main piston and upper cone, upper cone and slips and mandrel thread interlocking, by slips shear pin stationary slip, the chest-developing bar upper end is connected with mandrel thread with central tube activity hinge joint, lower end, articulate by the fixing lower cone of lower cone shear pin at the mandrel shoulder, the packing element upper and lower end extruding guard shield that connects down, the following pressure ring that connects down are connected with mandrel thread.Upper cone inboard groove Built-in lock spring interlocking mandrel, the slips external surface is that endless belt tooth, inner surface are screw thread.

The utlity model has following characteristics: one, slips are positioned at the packing element top, need only bore the mill off slips during deblocking, and instrument gets final product deblocking, bore and mill the distance weak point; Its two, packing element extruding guard shield, the directly inboard and stem seal of packing element, a plurality of snaps that seat is honored as a queen in the upper cone inboard groove lock the anti-high pressure of instrument with mandrel.

Description of drawings specifies with embodiment below in conjunction with accompanying drawing.

Fig. 1 shows structure chart of the present utility model.

Among the figure, the 1-top connection; The 2-lock dog; 3-auxiliary piston shear pin; The 4-auxiliary piston; The 5-main piston; The 6-central tube; The 7-chest-developing bar; The 8-snap; The 9-upper cone; The 10-mandrel; 11-slips shear pin; The 12-slips; The 13-lower cone; 14-lower cone shear pin; The 15-guard shield; The 16-packing element; Pressure ring under the 17-

The specific embodiment is with reference to accompanying drawing 1, a kind of high pressure can bore bridging plug, top connection 1 is paid piston 4 and main piston 5 with central tube 6 by being threaded, in the toroidal cavity of auxiliary piston shear pin 3 between top connection 1 and central tube 6, auxiliary piston 4 locks are pressed lock dog 2, by auxiliary piston shear pin 3 locking main pistons 5 central tubes 6 and top connection 1, main piston 5 and upper cone 9 lower ends and slips 12, fixing by slips shear pin 11, upper cone 9 is threaded with mandrel 10 with mandrel 10 screw thread interlocking chest-developing bars 7 lower ends, chest-developing bar 7 upper ends and the hinge joint of central tube 6 suits, lower cone 13 is fixing by lower cone shear pin 14 with mandrel 10 shoulders, packing element 16 is installed on the mandrel 10, on the packing element 16, lower end extruding guard shield 15, following pressure ring 17 is threaded with mandrel 10.

Described upper cone 9 inboard groove Built-in lock springs 8 interlocking mandrels 10; Slips 12 external surfaces are the endless belt tooth, and inner surface is a screw thread.

High pressure can bore the bridging plug course of work, high pressure can be bored bridging plug goes into the well to the precalculated position by designing requirement connection oil pipe, water filling is suppressed in oil pipe, when highly pressurised liquid enters auxiliary piston 4 and main piston 5 through the liquid-through hole of crossing of instrument top connection 1, top connection 1, the hydraulic pressure ring cavity of central tube 6, under the fluid pressure effect, auxiliary piston 4 moves downward cuts off auxiliary piston shear pin 3, remove lock and press lock dog 2, main piston 5 unlocks with central tube 6, main piston 5 moves downward under the fluid pressure effect, upper cone 9, snap 8, slips 12, lower cone 13, guard shield 15, packing element 16, following pressure ring 17 moves downward together, cut off slips shear pin 11 slips 12 distendings, cut off lower cone shear pin 14, extruding packing element 16 increases diameter, contacts the annular space of packing mandrel 10 and internal surface of sleeve pipe with shaft in wall, continue descending slips 12 and be anchored on the shaft in wall, snap 8 is an envelope state with upper cone 9 and mandrel 10 locking tools simultaneously.After grappling finished, main piston 5 unlocked with upper cone 9, and this moment, chest-developing bar 7 was connected with mandrel 10, when the fluid pressure of injection reaches design load, broke chest-developing bar 7, removed between central tube 6 and the mandrel 10 to be connected, and sent the envelope instrument to separate with capping tools.

High pressure can bore that bridging plug is applicable to that oil well selects that lamination splits, bottom water plugging and make the artificial bottom of a well hold the ash plug.

Claims

1, a kind of high pressure can bore bridging plug, it is characterized in that interior auxiliary piston (4) lock of the toroidal cavity pressure lock dog (2) that top connection (1) is threaded with central tube (6), by auxiliary piston shear pin (3) interlocking main piston (5), main piston (5) and upper cone (9), upper cone (9) and slips (12) and mandrel (10) screw thread interlocking, by slips shear pin (11) stationary slip (12), the movable hinge joint of chest-developing bar (7) upper end and central tube (6), the lower end is threaded with mandrel (10), articulate by the fixing lower cone (13) of lower cone shear pin (14) at mandrel (10) shoulder, down on the packing element (16) that connects, lower end extruding guard shield (15), the following pressure ring (17) that connects down is threaded with mandrel (10).

2, high pressure according to claim 1 can bore bridging plug, it is characterized in that upper cone (9) inboard groove Built-in lock spring (8) interlocking mandrel (10), and slips (12) external surface is that endless belt tooth, inner surface are screw thread.