CN2769493Y

CN2769493Y - Small-diameter hydraulic release joint

Info

Publication number: CN2769493Y
Application number: CN 200520020337
Authority: CN
Inventors: 刘亚三; 任志刚
Original assignee: Daqing Oilfield Co Ltd
Current assignee: Daqing Oilfield Co Ltd
Priority date: 2005-03-02
Filing date: 2005-03-02
Publication date: 2006-04-05
Anticipated expiration: 2015-03-02

Abstract

The utility model relates to a small-diameter hydraulic release joint for water plugging construction of an oil well, which mainly overcomes the defects that the existing water plugging release joint can not be used for the oil well of which the diameter is smaller than phi 114 mm after a sleeve pipe is deformed and reverse buckling release and ball delivering release are adopted to cause a pipe column not to be released. The utility model is characterized in that the lower end of an upper step of a central pipe (8) is provided with a liquid inlet hole (7), a release piston (4) is arranged in rounding spaces between an outer work cylinder (3) and the central pipe (8), and the release piston is fixed to the outer wall of the central pipe through a male pin (5); a release piece (6) is fixed between the outer side of the upper step of the central pipe (8) and a lower joint, and the release piece (6) is connected with the upper step of the central pipe (8) in an interference fit connection mode and connected with the lower joint (9) in a screwed connection mode. The utility model has the advantages that the maximum outside diameter is small and can be used for the oil well of which the diameter is smaller than phi 114 mm after the sleeve pipe is deformed, and the operation of release can be simultaneously realized when the packer is released; work procedure, such as reverse buckling, ball delivering pressurizing, etc., can be reduced.

Description

The back-off sub of minor diameter hydraulic pressure

Technical field:

The utility model relates to a kind of instrument used in the oil recovery field, oil field, especially relates to the water clogging tool that uses in the oilwell water shutoff construction on a kind of oil field.

Background technology:

On the oil field for the oil-water well of Φ 140mm cased hole completion, the water blockoff back-off sub that existing water-plugging technology adopted, all adopt left-hand thread to be threaded or pitching after just can cut off the structure that connects pin, the water blockoff back-off sub of this structure in use will be suppressed by ground after ground back-off or the pitching could realize that Packer for blocking water separates with oil pipe, and its minimum work external diameter is Φ 114mm, therefore make this back-off sub not have distortion or to be out of shape of the oil well use of back latus rectum at sleeve pipe greater than Φ 114mm, and need be lowered to anti-rotation slips instrument owing to adopt back-off to give up, increased difficulty of construction, adopt pitching give up then may because of the releasing tool lower end build the pressure or steel ball seat not tight, and problem such as cause that tubing string is lost not opened.

The utility model content:

For overcome existing water blockoff back-off sub can not be after casing deformation latus rectum less than using and adopt the deficiency that back-off is given up, pitching is given up and all may be caused tubing string to be lost not open in the oil well of Φ 114mm, the utility model provides the back-off sub of a kind of minor diameter hydraulic pressure, it is little that the back-off sub of this kind minor diameter hydraulic pressure has a maximum outside diameter, the advantage that can after casing deformation, use in the oil well of latus rectum less than Φ 114mm, and can when discharging, packer realize giving up, reduce back-off, pitching and operation such as suppressed, had easy construction and self-locking good effectiveness.

The technical solution of the utility model is: the back-off sub of this kind minor diameter hydraulic pressure, comprise top connection, lower contact, have the outer working tube of relief hole and be positioned at central tube within the outer working tube, wherein the upper part in the lower end of topping bar of central tube body has inlet opening, the piston of giving up in the annular space between outer working tube and the central tube, this piston of giving up is by the outer wall of dowel fixes in central tube, be fixed with a release piece topping bar of central tube between the outside and the lower contact, between the topping bar of this release piece and central tube for interference is connected, with lower contact for being threaded.

Above-mentioned release piece is the opening release piece, and its shape selects for use the open slot structure for best.

The utlity model has following beneficial effect: owing to take the minor diameter hydraulic pressure back-off sub of such scheme to utilize assemblies such as pin, piston, release piece to replace original trip gear, make and compare with back-off sub in the past, maximum outside diameter narrows down to 100mm by 114mm, therefore can after casing deformation, use in the oil well of latus rectum greater than Φ 114mm, and maximum operating pressure differential can reach more than the 20MPa; In addition, it can realize giving up when packer discharges, operation such as reduced that back-off, pitching are suppressed.

Description of drawings:

Accompanying drawing 1 is a structural representation of the present utility model.

1-top connection among the figure, 2-relief hole, 3-outer working tube, the 4-piston of giving up, 5-pin, inlet opening in the 6-release piece, 7-, 8-central tube, 9-lower contact.

The specific embodiment:

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

As shown in Figure 1, the back-off sub of this kind minor diameter hydraulic pressure, comprise top connection 1, lower contact 9, have the outer working tube 3 of relief hole 2 and be positioned at central tube 8 within the outer working tube 3, wherein the lower end of topping bar of central tube 8 has inlet opening 7, the piston 4 of giving up in the annular space between outer working tube 3 and the central tube 8, this piston of giving up is fixed in the outer wall of central tube by pin 5, be fixed with a release piece 6 topping bar of central tube 8 between the outside and the lower contact, this release piece 6 is topped bar to interference is connected with central tube 8, with 9 of lower contacts for being threaded.

In the technical program, the minimum number of described relief hole 2 is four, can place the outside of release piece 6 to play supporting role in the lower part of the up and down piston 5 of giving up of the outer working tube 3 and the annular space of

central tube

8,5 of pins play the effect of fixedly give up piston 4 and central tube 8, be connected and be threaded by interference because release piece 6 and central tube 8 are topped bar with lower contact 9, when this release piece 6 of piston stroking upward loses external support, on put on joint 1 release piece 6 and central tube 8 are thrown off.For guaranteeing the realization of this purpose, central tube 8 is an opening release piece 6 with the trip gear of lower contact 9, release piece 6 is connected to interference with topping bar of central tube 8 and is connected, piston 4 lower support guarantee bonding strength by giving up, when the piston of giving up up under pressure, when release piece 6 lost external support, the upper lifting pipe post can make central tube 8 and release piece 6 throw off.

For making when there is external support in release piece, there is enough intensity to guarantee that lower tubular column is not thrown off in the back-off sub, and when losing external support, tubing string only needs less upper lifting force amount can make lower tubular column disengagement in the back-off sub, can select release piece 6 to be equally distributed open slot structure, make it have certain elasticity and intensity thus.

Actual when utilizing the utility model to carry out plug water construction, the utility model is arrived the oil reservoir position with supporting water clogging tool down with oil pipe, when by ground installation when oil pipe pumps into hydraulic pressure, pressure at first acts on the piston 4 of giving up by the interior inlet opening 7 on the central tube, when pressure acquires a certain degree, cut off release pin 5, at this moment the piston 4 of giving up is up, when face is gone in ring in the outside of leaving release piece 6 when piston 4 bottoms of giving up, release piece 6 loses external support, at this moment carry oil pipe on, central tube 8 is topped bar and release piece 6 is thrown off, thereby realizes the disengaging of Packer for blocking water and oil pipe.

Claims

1, the back-off sub of a kind of minor diameter hydraulic pressure, comprise top connection (1), lower contact (9), have the outer working tube (3) of relief hole (2) and be positioned at central tube (8) within the outer working tube (3), it is characterized in that: the lower end that central tube (8) is topped bar has inlet opening (7), the piston (4) of giving up in the annular space between outer working tube (3) and the central tube (8), this piston of giving up is fixed in the outer wall of central tube by pin (5), be fixed with a release piece (6) topping bar of central tube (8) between the outside and the lower contact, this release piece (6) is topped bar to interference is connected with central tube (8), with lower contact (9) for being threaded.

2, a kind of minor diameter hydraulic pressure according to claim 1 back-off sub is characterized in that described release piece (6) is the opening release piece.

3, minor diameter hydraulic pressure according to claim 1 and 2 back-off sub is characterized in that release piece (6) is equally distributed open slot structure.