CN2782911Y

CN2782911Y - Wall hook type tail pipe hanging device for lateral well

Info

Publication number: CN2782911Y
Application number: CN 200520020711
Authority: CN
Inventors: 祁兆清; 罗凌威; 张庆玉; 任文进
Original assignee: Daqing Petroleum Administration Bureau
Current assignee: Daqing Petroleum Administration Bureau
Priority date: 2005-04-27
Filing date: 2005-04-27
Publication date: 2006-05-24
Anticipated expiration: 2015-04-27

Abstract

The utility model relates to a wall-hook type tail pipe hanging device used in well drilling and well completion techniques of branch wells, which mainly solves the defect that a tail pipe hanging device used in the existing well completion technique of the branch wells can not easily realize the transfixion of main and branch well holes. The utility model is characterized in that the middle part of a hanging device main body (2) is provided with a pre-opening window (3), a hanging hook (4) is fixed to the lower end of the pre-opening window (3) in a jointing mode, and a positioning sleeve (5) is fixed between the hanging device main body (2) and a lower end sleeve pipe buckle (6) in a jointing mode. The utility model has the characteristic that the transfixion of the main and the branch well holes can be successfully realized, and the operation of entering a lateral branch can be realized through being lowered a special guiding tool.

Description

A kind of Multilateral Wells wall hook formula extension hanger

Technical field:

The utility model relates to underground work instrument used in the oil recovery field, oil field, especially relates to a kind of extension hanger that is used for the branch hole drilling completion technique.

Background technology:

The perforation of main split's well is a decision Multilateral Wells key of success.At present, the Multilateral Wells completion mode is a lot of both at home and abroad, but the perforation technology mainly all is to adopt to overlap two kinds of methods of milling with milling.Milling is after top set's cementing operation finishes, and is lowered to the logical top set's tail pipe stayed in the main hole of bradawl tool mill, and itself and main hole are connected.This mode principle is simple, but owing to want the tail pipe oblique angle of milling very little, wants the logical sleeve pipe of plummet direction mill within it, and difficulty of construction is very big.Success rate is very low, and has a big risk.The cover mode of milling is after top set's cementing operation finishes, to be lowered to the packaged milling tool cover and to mill out the nubbin of all top set's tail pipes in main hole.This mode complex process, strict to instrument, possibility of accident occurrence is very high, and after particularly cover milled end, the tail pipe of branch well hole did not support, and mechanical connection and water conservancy sealing all are difficult to guarantee, and the later stage branch well hole reenters difficulty.

The utility model content:

Be not easy to the deficiency that realizes that main split's well connects in order to overcome employed extension hanger in the existing Multilateral Wells completion technique, the utility model provides a kind of Multilateral Wells wall hook formula extension hanger, this kind Multilateral Wells has the characteristics that can realize smoothly that main split's well connects with wall hook formula extension hanger, and when needs reentered lateral branching, the steering tool that only need be lowered to a special use can be realized.

The technical solution of the utility model is: this kind Multilateral Wells wall hook formula extension hanger, comprise the hanger body that is fixed with upper sleeve portion button, lower end cover pipe thread, wherein have a pre-windowing at the middle part of hanger body, lower end at pre-windowing is welded with a hanged hook, is welded with a positioning sleeve between hanger body and the lower end cover pipe thread.

The utlity model has following beneficial effect: owing to take the Multilateral Wells of such scheme with being welded with a hanged hook on the wall hook formula extension hanger main body and having a pre-drilled cavity, make and to utilize hanged hook to realize hanging automatically, and utilize pre-opening to realize the perforation of main split's pit shaft.Therefore, use this kind wall hook formula extension hanger to carry out the main split well when connecting, tool interior in advance device side behind the precalculated position, will be suspended on automatically on the protective casing window under the hanger to guide cylinder, realize hanging function.Simultaneously, the pre-drilled cavity of instrument after top set's cementing operation finishes, takes out the side direction guide cylinder over against the main borehole direction, and pre-drilled cavity is opened, and can realize smoothly that just main split's well connects.In the time of must reentering lateral branching, only need be lowered to the side direction guide cylinder can realize.

Description of drawings:

Accompanying drawing 1 is a structure sectional view of the present utility model.

1-goes up the cover pipe thread among the figure, 2-hanger body, the pre-windowing of 3-, 4-hanged hook, 5-positioning sleeve, the 6-pipe thread of trapping.

The specific embodiment:

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

As shown in Figure 1, this kind Multilateral Wells wall hook formula extension hanger, comprise the hanger body 2 that is fixed with upper sleeve portion button 1, lower end cover pipe thread 6, wherein have a pre-windowing 3 at the middle part of hanger body 2, lower end at pre-windowing 3 is welded with a hanged hook 4, is welded with a positioning sleeve 5 between hanger body 2 and the lower end cover pipe thread 6.

The actual use when carrying out Multilateral Wells side direction top set setting of casing, overlap wall hook formula hanger 5 spacing by positioned internal, the side direction guide cylinder that assembling is special-purpose, shutoff also seals pre-windowing 3, the hanger bottom is linked to each other with the tail pipe string by lower end cover pipe thread 6, and top is connected to the mechanism of slipping out of the hand by last cover pipe thread 1.After hanger arrived main hole casing sidetracking position, hanged hook 4 was stuck on the sleeve pipe window wall, under thrust, hanger rotates, make hanged hook 4 be suspended on main hole lower window edge and fixing, the pre-drilled cavity of hanger can carry out normal cementing operation over against the main borehole direction at this moment.After cementing operation finished, the mechanism of slipping out of the hand broke away from, and proposes special-purpose side direction guide cylinder, and pre-windowing 3 is opened, and has realized the perforation of main split's well.The subsequent job tubing string can freely pass through pre-windowing 3 discrepancy bottom main holes under action of gravity, if think to enter again top set's well when carrying out construction such as perforation, pressure break, only need dedicated side is lowered into wall hook formula hanger position to guide cylinder, spacing by positioning sleeve 5, block pre-drilled cavity, make top set form closing pipe line, just can realize entering again of lateral branching.

Claims

1, a kind of Multilateral Wells wall hook formula extension hanger, comprise the hanger body (2) that is fixed with upper sleeve portion button (1), lower end cover pipe thread (6), it is characterized in that: have a pre-windowing (3) at the middle part of hanger body (2), lower end at pre-windowing (3) is welded with a hanged hook (4), is welded with a positioning sleeve (5) between hanger body (2) and the lower end cover pipe thread (6).