CN2261507Y

CN2261507Y - Reusable bridge plug

Info

Publication number: CN2261507Y
Application number: CN 96202998
Authority: CN
Inventors: 邬彦辉
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-02-28
Filing date: 1996-02-28
Publication date: 1997-09-03
Anticipated expiration: 2006-02-28

Abstract

The utility model relates to a recoverable bridge plug which is a tool for closing a stratum in an oil well. The existing reclaimable bridge plug is hard to unseal, because a lower cone of which the upper part is small and the lower part of which is big is in an integral type. When the plug is recovered, the cone can not move up easily. In the utility model, the whole lower cone is divided into an inner and an outer cones, wherein, the upper part of the inner cone is big, and the lower part is small; the outer cone is a split type. The two cones are combined together to form the combined lower cone. Sealing force makes the two cones move oppositely to force slips to be clipped on the inner wall of a casing tube during seal. The inner cone and the upper cone move upwards to drive the slips to be shrunk to unseal during unsealing. The structure of the recoverable bridge plug is disclosed in the figure in the specification, wherein, the lower slips are disclosed in the figure (6), the inner cone is disclosed in the figure (7), a dovetail groove is arranged in the figure (8), the integral spilt outer cone is disclosed in the figure (9), and the combined lower cone is disclosed in the figure (10).

Description

Recyclable bridging plug

The utility model is the downhole tool that is applicable to oil well about a kind of, particularly a kind of recyclable bridging plug that seals the stratum.

Existing recyclable bridging plug complex structure, volume be big, be difficult to resolve envelope.Because the monolithic lower cone is up-small and down-big, the upper lifting pipe post can not make it move upward during recovery, so can not deblocking.Wanting deblocking, a downward power at first will be arranged, generally is with transferring the way of tubing string, with the weight of tubing string lower cone is moved downward, then upper lifting pipe post ability deblocking.This deblocking way is very unreliable, very firm when the lower cone card, and when transferring power that tubing string produces lower cone being moved downward, just can not deblocking; In the big well of gradient, because tubing string is close on the crooked internal surface of sleeve pipe, the power of transferring the tubing string generation can't be delivered on the lower cone, can not deblocking.

The purpose of this utility model provides a kind of recyclable bridging plug of easy deblocking.

The purpose of this utility model is achieved in that the bridging plug bottom is by a combined type lower cone of being made up of inner cone and Outer Taper.Inner cone is connected with central tube.Outer Taper is whole split-type, and top is multi-clove type, is the integral body that links together between each lobe of bottom; The inside is conical, up big and down small, is linked in inner cone; There are a plurality of swallow tail shaped slots the outside, and the upper end of groove tilts to direction of axis line, and the lower end is to tilting away from direction of axis line, and swallow tail shaped slot is meshed with the swallow-tail form slips.During the seat envelope, seat envelope power moves downward upper cone, and lower cone moves upward, and forces slips outwards to open, and is stuck in firmly on the internal surface of sleeve pipe, and compressed packing element seals the stratum.During deblocking, the upper lifting pipe post because inner cone is up big and down small, thus it can along with on the tubing string carried move upward.The split-type Outer Taper is shunk because of the support that loses inner cone, and the tubing string of carrying on subsequently is being with upper cone to move upward again, under the guide effect of swallow tail shaped slot, lower slips is shunk and deblocking.

Because the utility model has a combined type lower cone, it will be difficult to resolve envelope, up-small and down-big whole lower cone and be decomposed into inside and outside two cones, and the inner cone after the decomposition is up big and down small, and Outer Taper is up-small and down-big, be multi-clove type.Needed two deblocking power up and down were reduced to and only need a deblocking power that makes progress when this just will reclaim.Thereby the upper lifting pipe post, under the guide effect of dovetail groove, just can make the bridging plug deblocking and reclaim, its structure is simple and reliable especially.Because only need a deblocking power that makes progress, so be easy to operation and implement.Fundamentally having solved recyclable bridging plug can not deblocking, unrenewable problem.

Concrete structure of the present utility model is provided by following embodiment and accompanying drawing thereof.

Accompanying drawing is the vertical half sectional view according to the recyclable bridging plug that the utility model proposes.

Below in conjunction with details and the working condition of accompanying drawing detailed description according to the concrete structure that the utility model proposes.

(1) among the figure-from lock tube, (2)-central tube, (3)-packing element, (4)-upper cone, (5)-upper slips, (6)-lower slips, (7)-inner cone, (8)-swallow tail shaped slot, (9)-whole split-type Outer Taper, (10)-combined type lower cone.

There are packing element (3), upper cone (4) and slips (5) (6) in the outside of central tube (2).Inner cone (7) is connected with central tube (2); Perhaps inner cone (7) is made an integral body with central tube (2), and inner cone (7) is up big and down small.Outer Taper (9) is whole split-type, and top is multi-clove type, is the integral body that links together between each lobe of bottom; It is as a whole perhaps Outer Taper (9) to be made many lobes recombinant; Perhaps Outer Taper (9) is made multi-clove type.The inside of Outer Taper (9) is conical, up big and down small, is linked in inner cone (7), forms combined type lower cone (10).There are a plurality of swallow tail shaped slots (8) outside of Outer Taper (9), and the upper end of groove (8) tilts to direction of axis line, and the lower end is to tilting away from direction of axis line, and swallow tail shaped slot (8) is meshed with swallow-tail form slips (6); Perhaps do coning the outside of Outer Taper (9), up-small and down-big, is meshed with conical slips.The seat envelope, under the effect of present envelope power, central tube (2) and combined type lower cone (10) together move upward, and move downward from lock tube (1), by extruded packing element (3) upper cone (4) are also moved downward.Two slips (5) (6) outwards opened about two cones (4) (10) up and down of move toward one another forced, and were stuck in firmly on the internal surface of sleeve pipe, and the packing element that is extruded (3) seals the stratum.Deblocking, fishing tool catches central tube (2) and inner cone (7) together to move upward, inner cone (7) is separated with split-type Outer Taper (9), split-type Outer Taper (9) is shunk because of the support that loses inner cone (7), the central tube (2) that continues to move upward then is being with upper cone (4) to move upward again, under the guide effect of swallow tail shaped slot (8), last lower slips (5) (6) shrinks and deblocking.

Claims

1. one by the recyclable bridging plug of forming from lock tube (1), central tube (2), packing element (3), upper cone (4) and upper slips (5), it is characterized in that a combined type lower cone (10) of being made up of inner cone (7) and Outer Taper (9) is arranged at the bridging plug bottom.

2. by the described recyclable bridging plug of claim 1, it is characterized in that the inner cone (7) that has to be connected with central tube (2); Perhaps inner cone (7) is made an integral body with central tube (2).

3. by the described recyclable bridging plug of claim 1, it is characterized in that there is a whole split-type Outer Taper (9) outside of inner cone (7), the top of Outer Taper (9) is multi-clove type, is the integral body that links together between each lobe of bottom; It is as a whole perhaps Outer Taper (9) to be made many lobes recombinant; Perhaps Outer Taper is made multi-clove type.

4. by the described recyclable bridging plug of claim 3, there are a plurality of swallow tail shaped slots (8) outside that it is characterized in that whole split-type Outer Taper (9), the upper end of groove (8) tilts to direction of axis line, and the lower end is to tilting away from direction of axis line, and swallow tail shaped slot (8) is meshed with swallow-tail form slips (6); Perhaps do coning the outside of Outer Taper (9), up-small and down-big, is meshed with conical slips.