CN201212375Y

CN201212375Y - Check valve

Info

Publication number: CN201212375Y
Application number: CNU2008201085990U
Authority: CN
Inventors: 赵海库
Original assignee: BEIJING SINOPETROLEUM TECHNOLOGY Inc
Current assignee: BEIJING SINOPETROLEUM TECHNOLOGY Inc
Priority date: 2008-06-18
Filing date: 2008-06-18
Publication date: 2009-03-25
Anticipated expiration: 2018-06-18

Abstract

The utility model relates to a check valve which aims at overcoming the defects existing in the prior downhole operation integral construction pipe column that formation sand production exists and other mechanical foreign substances enter into a pipe column, which results in the accident that cable tool string is buried and clipped at the bottom of the well. In the utility model, an upper connector (1) and a lower connector (8) are fixedly connected to form a valve body (9); a sliding valve (2) is installed in the inner hole of the valve body (9); the excircle of the sliding valve (2) is a stepped shaft with the shape that the upper part is big and the lower part is small, the area of the upper end surface of the sliding valve (2) is larger than that of the lower end surface; an axial spring (5) is installed between the minor diameter excircle of the sliding valve (2) and the inner hole of the valve body (9); a sealing ring (3) is installed between the upper part of the sliding valve (2) and the inner hole of the valve body (9); a sealing ring (7) is installed between the lower part of the sliding valve (2) and the inner hole of the valve body (9); and a fluid draining hole (4) and an air discharging hole (6) are arranged on the valve body (9). The utility model has the advantages that the structure is simple, the performance is reliable, internal clean of the pipe column is ensured, no mechanical foreign substance exists, thus the safety of the cable operation is improved.

Description

Flap valve

Affiliated technical field

The utility model relates to the supporting downhole tool of a kind of oil and gas development underground work tubing string, particularly relates to a kind of flap valve.

Background technology

At present, in oil and gas development underground work,, use the institutional operation tubing string in order to have reduced lower tubular column more.When using the integrated pipe column operation, need carry out a large amount of cable operations, as pulling blanking plug, switching sliding sleeve, well testing etc., because mechanical admixtures such as formation sand production, perforation relic will enter test string in open flow is asked the process of product.It is very unfavorable to the cable operation that mechanical admixture enters test string, the cable tool string often takes place buried the card down-hole accident.

The utility model content

For formation sand production and other the mechanical foreign material that overcome existing underground work integrated construction tubing string existence enter tubing string, cause the cable tool string to be buried the deficiency that the card down-hole accident takes place, the utility model provides a kind of flap valve, this flap valve is installed in the integrated underground work tubing string, can prevent effectively that formation sand production and other mechanical foreign material from entering tubing string, avoids the cable tool string to be buried the generation of card down-hole accident.

The technical scheme that its technical problem that solves the utility model adopts is: the top connection of flap valve and the lower contact valve body that is composed of a fixed connection; In the valve body is inner bore of step broad in the middle small in ends; Guiding valve is installed in the valve body inner bore; The guiding valve cylindrical is up big and down small multidiameter, and guiding valve upper surface area is greater than the lower surface area; On the minor diameter cylindrical of guiding valve axle spring is installed; Between guiding valve top and the valve body inner bore sealing ring is installed; Between guiding valve bottom and the valve body inner bore sealing ring is installed; When guiding valve is positioned at valve body when upper, and on the valve body of spring top correspondence position outage is arranged; With on the valve body of spring bottom correspondence position steam vent is arranged.

The beneficial effects of the utility model are that simple in structure, dependable performance is guaranteed cleaning in the tubing string, does not have mechanical impurity, improves down-hole cable operational security.

Description of drawings

Fig. 1 is the utility model closure of check ring schematic diagram.

Fig. 2 is that the utility model flap valve is opened schematic diagram.

Among the figure: 1. top connection, 2. guiding valve, 3. sealing ring, 4. outage, 5. spring, 6. steam vent, 7. sealing ring, 8. lower contact, 9. valve body.

The specific embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

The utility model flap valve mainly comprises top connection 1, lower contact 8, guiding valve 2, spring 5 etc., and top connection 1 endoporus is up-small and down-big shoulder hole, and lower contact 8 endoporus are up big and down small shoulder hole; Top connection 1 and lower contact 8 valve body 9 that is composed of a fixed connection.Valve body 9 endoporus are stepped hole broad in the middle small in ends; Guiding valve 2 is installed in the bigger endoporus of valve body 9, and guiding valve 2 can slide up and down along valve body 9 endoporus; When sliding into bottom dead centre, the upper surface of guiding valve 2 is lower than outage 4.

Guiding valve 2 cylindricals are up big and down small multidiameter, and guiding valve 2 upper surface areas are greater than the lower surface area.Between the minor diameter cylindrical of guiding valve 2 and valve body 9 endoporus axle spring 5 is installed.Guiding valve 2 upper ends cooperate with top connection 1 endoporus of valve body 9, for being slidingly matched, between radial direction seal ring 3 is installed; Guiding valve 2 bottoms cooperate with lower contact 8 endoporus of valve body 9, for being slidingly matched, between radial direction seal ring 7 is installed.Guiding valve 2 slides up and down along the endoporus of valve body 9, and sliding scale is by the upper and lower step surface control in the valve body 9.

When guiding valve 2 is positioned at valve body 9 when upper, and on the valve body 9 of spring 5 top correspondence positions outage 4 is arranged; With on the valve body 9 of spring 5 bottom correspondence positions steam vent 6 is arranged.Outage 4 and steam vent 6 are radial hole.

The function of the utility model flap valve is achieved in that guiding valve 3 is in top dead-centre (as shown in Figure 1), i.e. closed condition under the effect of spring 5.When the pressure in the operation tubing string during greater than the pressure outside the tubing string, because there is area difference the upper surface and the lower surface of guiding valve 3, guiding valve 3 is under downward pressure effect, move down compression spring 5, when guiding valve 3 upper surfaces are lower than outage 4, outage 4 is opened (as shown in Figure 2), and liquid can flow to outside the pipe smoothly in the tubing string; Open flow is asked when producing, and the pressure in the tubing string reduces, and guiding valve 3 progressively returns to upper, closes outage 4, and the outer fluid of tubing string can not be entered in the pipe, also effectively stops formation sand production and other foreign material to enter in the tubing string simultaneously.

The utility model flap valve is installed in the integrated pipe column construction operation tubing string, increases an additional channel to tubing string in the acid fracturing operation process, allows acid solution successfully enter the stratum; This passage is closed automatically when product is asked in discharge opeing, and the fluid that enters tubing string can only enter tubing string by sand control screen.In the institutional operation tubing string, flap valve is installed, mechanical admixtures such as perforation relic, formation sand production can be isolated in outside the tubing string, guarantee cleaning in the tubing string, do not have mechanical impurity, improve the cable operational security, avoid the cable tool string to be buried the generation of down-hole accidents such as card.

Claims

1. flap valve is characterized in that: top connection (1) and lower contact (8) valve body (9) that is composed of a fixed connection; In the valve body (9) is inner bore of step broad in the middle small in ends; In valve body (9) endoporus guiding valve (2) is installed;

Guiding valve (2) cylindrical is up big and down small multidiameter, and guiding valve (2) upper surface area is greater than the lower surface area; Axle spring (5) is installed on the minor diameter cylindrical of guiding valve (2);

Between guiding valve (2) top and valve body (9) endoporus sealing ring (3) is installed; Between guiding valve (2) bottom and valve body (9) endoporus sealing ring (7) is installed;

When guiding valve (2) is positioned at valve body (9) when upper, and on the valve body (9) of spring (5) top correspondence position outage (4) is arranged; With on the valve body (9) of spring (5) bottom correspondence position steam vent (6) is arranged.