CN2648051Y

CN2648051Y - Dual piston self-packing type packer capable of flushing well

Info

Publication number: CN2648051Y
Application number: CN 03280256
Authority: CN
Inventors: 何富全; 王泽生
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-09-19
Filing date: 2003-09-19
Publication date: 2004-10-13
Anticipated expiration: 2013-09-19

Abstract

The utility model relates to a dual-piston self-sealing washable well packer which mainly solves the problem of unreliable sealing of the well washing mechanisms of the current washable well packers. The utility model is characterized in that: a piston (5) is arranged between a piston sleeve (2) which is opened with a liquid inlet hole (6) at the lower end and a center pipe (4), a spring (3) is arranged between an upper connector (1) and the piston (5); a setting piston (17) and a push sleeve (15) are sequentially arranged between the piston sleeve (16) and the center pipe (4), a fixed piston (13) is arranged between the push sleeve (15) and the center pipe (4), a setting card sleeve (7) and a lower well washing piston (9) which is provided with a conical inclined surface are arranged between a locking sleeve (8) and the center pipe (4), and a spring (12) is arranged between the lower well washing piston (9) and the fixed piston (13). The utility model is characterized by automatic closed well washing channel, good setting effect, time saving, energy saving and high work efficiency.

Description

The self-sealed washing well packer of a kind of double-piston

Technical field:

The utility model relates to the used packer of oil field oil production engineering seperated layer water injection field of tool, belongs to the self-sealed washing well packer of a kind of double-piston.

Background technology:

In the waterflooding extraction technology in oil field, water injection string be unable to do without packer, and packer is exactly when seperated layer water injection multiple zone is divided into some intervals.The kind of packer is a lot, various packers have different characteristics, but after underground work a period of time, the various technical problems of water injection string inefficacy that cause just come out, because packer well-washing mechanism seal operation poor performance, application life is short, the well-flushing passage that causes the washing well packer can be opened voluntarily but can not close voluntarily, therefore causes the tubing string operational failure, and that has on the scene repeat in a large number plays well operations for this reason, cause inefficiency, the cost of production height.

The utility model content:

In order to overcome short deficiency of existing packer well-washing mechanism seal operation poor performance, application life, the utility model provides a kind of double-piston self-sealed washing well packer, and the well-flushing passage of this packer has can close and the characteristics of good sealing effect automatically.

The technical scheme that the utility model adopted is: the self-sealed washing well packer of a kind of double-piston comprises lower contact, goes up the well-flushing piston, sets piston bush and central tube, be equipped with central tube and piston bush inside and outside the last lower contact, set and be equipped with lock sleeve on the piston bush, be equipped with central tube and piston bush inside and outside the last lower contact, the lower end has between the piston bush of inlet opening and the central tube and is equipped with piston, is equipped with spring between top connection and the piston; Be equipped with successively between piston bush and the central tube bottom and set piston and promote cover, promote to be equipped with fixed piston between cover and the central tube, be equipped with the following well-flushing piston that sets cutting ferrule and have the circular cone inclined-plane between lock sleeve and the central tube, be equipped with spring between following well-flushing piston and the fixed piston.

The lower end of above-mentioned lock sleeve and the upper end that promotes cover are for being threaded; Fixed piston blocks with the boss place of central tube and mutually for being threaded; Setting the lower end bore area of cutting ferrule and the upper end of following well-flushing piston is complementary; Following well-flushing piston is circular steel piston inner core.

The beneficial effects of the utility model are: because this packer is equipped with spring on last well-flushing piston, lean on the elastic force of spring can realize the self-return process of well-flushing piston, the import of well-flushing passage is in sealing state when packer setting; Because packer down is being equipped with spring under the well-flushing piston, can realize down the self-return process of well-flushing piston by the elastic force of spring, the outlet of well-flushing passage also is in sealing state during packer setting; Closing automatically of following well-flushing piston stops hydraulic pressure to enter the well-flushing passage, makes the lower surface of well-flushing piston be subjected to opening pressure to reduce half, and the pressure that piston is closed is a times of piston opening pressure; The cavity structure of setting mechanism can make the effect of the direct liquid body pressure of piston and finishes the process of setting, and also can suppress the process of setting of finishing by pump truck, and it is good to set performance.

Description of drawings:

Fig. 1 is the utility model structure sectional view.

1-top connection among Fig. 1,2-piston bush, 3-spring, 4-central tube, the last well-flushing piston of 5-, the 6-inlet opening, 7-sets cutting ferrule, the 8-lock sleeve, well-flushing piston under the 9-, 10-piston core, the 11-fluid hole, 12-spring, 13-fixed piston, 14-booster cavity, 15-promote cover, 16-piston bush, 17-sets piston, 18-inlet opening, 19-lower contact.

The specific embodiment:

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

As shown in 1 figure, the self-sealed washing well packer of a kind of double-piston comprises lower contact (1,19), last well-flushing piston 5, set piston bush 16 and central tube 4, last lower contact (1,19) be equipped with central tube 4 and piston bush (2 inside and outside, 16), set and be equipped with lock sleeve 8 on the piston bush 16, the lower end has between the last well-flushing piston bush 2 of inlet opening 6 of flushing fluid and the central tube 4 and is equipped with well-flushing piston 5, be equipped with spring 3 between top connection 1 and the last well-flushing piston 5, the inlet opening 6 of well-flushing passage is by last well-flushing piston 5 shutoff when packer setting, during deblocking under the effect of spring 3 elastic force, can make well-flushing piston 5 reset, inlet opening 6 communicated with the well-flushing passage and can enter flushing fluid and carry out well-flushing this moment; Set to be equipped with successively between piston bush 16 and central tube 4 bottoms and set piston 17 and promote cover 15, promote to be equipped with fixed piston 13 between cover 15 and the central tube 4, fixed piston 13 blocks with the boss place of central tube 4 and mutually for being threaded, be equipped with the following well-flushing piston 9 that sets cutting ferrule 7 and have the circular cone inclined-plane between lock sleeve 8 and the central tube 4, set the lower end bore area of cutting ferrule 7 and the upper end of following well-flushing piston 9 and be complementary, help the shutoff of well-flushing passage; The lower end of lock sleeve 8 and the upper end that promotes cover 15 are for being threaded, be equipped with spring 12 between following well-flushing piston 9 and the fixed piston 13, under the effect of spring 12 elastic force, make well-flushing piston 9 self-returns down, shutoff the outlet of well-flushing passage, well-flushing piston 9 separates under fluid hole 11 quilts of well-flushing passage and flushing fluid at this moment, stoped hydraulic pressure to enter the well-flushing passage, open half end face that hydraulic pressure can only act on well-flushing piston 5 lower surfaces, last well-flushing piston 5 is closed the pressure of well-flushing passage greater than its opening pressure, and its pressure reduction is one times; And promote cover 15, central tube 4, fixed piston 13 and set to constitute between the piston 17 to set booster cavity 14, can lean on the pressure of fluid column really to connect to make to set piston 17 and move upward and set, also can suppress from inlet opening 18 and enter hydraulic setting by pump truck; Following well-flushing piston 9 is circular steel skeleton piston inner core 10, and following well-flushing piston 9 is played a supporting role.

Because this packer has adopted said structure, make to set dependable performance, good sealing effect, time saving and energy saving high efficiency.

Claims

1, the self-sealed washing well packer of a kind of double-piston, comprise lower contact (1,19), go up well-flushing piston (5), set piston bush (16) and central tube (4), last lower contact (1,19) be equipped with central tube (4) and piston bush (2 inside and outside, 16), set and be equipped with lock sleeve (8) on the piston bush (16), it is characterized in that: the lower end has between the last well-flushing piston bush (2) of inlet opening (6) and the central tube (4) and is equipped with well-flushing piston (5), is equipped with spring (3) between top connection (1) and the last well-flushing piston (5); Set to be equipped with successively between piston bush (16) and central tube (4) bottom and set piston (17) and promote cover (15), promote to be equipped with fixed piston (13) between cover (15) and the central tube (4), be equipped with the following well-flushing piston (9) that sets cutting ferrule (7) and have the circular cone inclined-plane between lock sleeve (8) and the central tube (4), be equipped with spring (12) between following well-flushing piston (9) and the fixed piston (13).

2, the self-sealed washing well packer of a kind of double-piston according to claim 1 is characterized in that: the lower end of lock sleeve (8) and the upper end that promotes cover (15) are for being threaded.

3, the self-sealed washing well packer of a kind of double-piston according to claim 1 is characterized in that: fixed piston (13) blocks with the boss place of central tube (4) and mutually for being threaded.

4, the self-sealed washing well packer of a kind of double-piston according to claim 1 is characterized in that: set the lower end bore area of cutting ferrule (7) and the upper end of following well-flushing piston (9) and be complementary.

5, the self-sealed washing well packer of a kind of double-piston according to claim 1 is characterized in that: following well-flushing piston (9) is a circular steel piston inner core (10).