SU1694862A1 - Gas well cut valve - Google Patents

Abstract

FIELD: well equipment. used in gas industry during well operation to cut off gas flow from the reservoir and in case of an emergency. The purpose of the invention is to increase the efficiency and operational reliability by providing the possibility of its automatic switching on while at the same time limiting the decrease in pressure in the tracking chamber when the closure member is closed. The shut-off valve includes a housing (K) 1 with an axial channel, means 2 for throttling and a seat, a locking member in the form of a spring-loaded disk-type valve 4 with a control unit including an axial movement installed in K 1 with a locking member and a three-stage piston (TP ) 5 with an axial channel forming with K 1 sequentially placed and hydraulically connected with each other and with the axial channel K 1 of an annular and tracking chamber 6,7 and means for supplying the sieve agent. A sealing sleeve 8 with axial and longitudinal channels (PC) hydraulically connected to the annular chamber 6 and the axial channel K 1 is located in the lower part of K 1 under the locking body with the ability to interact with the lower stage of the TP 5, below the level of the valve body with an annular groove hydraulic communication of the PC with a calibrated destructible diaphragm. Last installed in PC under groove. Throttling means 2 are placed between chambers 7 and 6. Steps of TP 5 have diameters decreasing in the direction of the locking member, and, between K 1, the upper and middle stages of TP 5 are formed by a control chamber 13 with means for supplying a power agent. 4 il. smiling 00 o you

Description

The invention relates to downhole equipment and can be used in the gas industry in the operation of wells, for cutting off gas flow from the formation, and in the event of an emergency.

The purpose of the invention is to increase the efficiency and operational reliability by ensuring safety.

automatically switching it on while simultaneously reducing the pressure decrease in the tracking chamber when the closure member is closed.

Fig. 1 shows a general view of a valve-extractor for a gas well; Fig. 2 shows a sealing sleeve; on fig.Z - spring-loaded trap valve in the closed position; Fig 4 - the same. at

the position of the flow of gas in the initial period of opening.

The valve for the gas well includes a housing 1 with an axial channel and means 2 for throttling and a saddle 3, a locking member in the form of a spring-loaded disk-type valve 4 with a control unit including, installed in the housing 1 with axial displacement and interaction with the locking member, a piston 5 with an axial channel forming with the housing 1 sequentially arranged and hydraulically connected with each other and with the axial channel of the housing 1 annular and tracking chambers 6,7 and means for supplying the power agent. The shut-off valve is also provided with a sealing sleeve 8 with an axial and longitudinal channels 9,10 which are hydraulically connected to the annular chamber 6 and the axial channel of the housing 1 below the valve body 8 located in the lower part of the housing 1 under the locking member. installation of a locking member with an annular groove 11 for hydraulic communication of the longitudinal channels 9,10 and with a calibrated destructive diaphragm 12 installed in the longitudinal channel 10 under the annular groove 11, means 2 for throttling once escheno between 7 and following the annular chambers 6, wherein the step of piston 5 have diameters umenshayuschies towards the closure member, and between the housing 1 upper and middle stages of the piston 5 is formed by the control chamber 13 with means for supplying the power agent. The locking member is made in the form of a spring-loaded and disc flap 4 mounted on axis 14. Hole 15 in the disc x flap 4 is elliptical. This allows the formation of an additional axis of rotation around the support point 16 of the flap 4 on the saddle 3. The movable elements of the valve are the cutter and sealing assemblies are provided with sealing rings 17. The means for feeding the power agent comprises a supply channel 18 and a pulse tube 19.

Shutoff valve operates as follows.

It is lowered into the well on the tubing, running a pulse tube 19 from the wellhead. A valve 3 is installed in the valve body 1, on which a spring-loaded damper valve 4 can be seated when the valve is closed. The closure member is driven by a hollow three-stage piston 5, which

forms with the housing 1 three chambers - a control chamber 13, a tracking chamber 7 and an annular chamber 6, Chambers 6 and 7 communicate with each other by means of throttling 2, the purpose of chamber 7 to monitor the pressure in the cavity of the tubing and if it drops sharply or in the event of an accident, close the valve, affecting the second piston stage 5.

0 Throttle 2, on the one hand, provides pressure transfer to chamber 7, and on the other hand, slow gas bypass from it. In chamber 6 there is a spring-loaded trap valve 4 and before the start of work

5 of the device, the cavity of the chamber 6 is isolated from the well fluid, and the pressure in it is atmospheric. The sealing sleeve 8 is designed to protect the chambers 6 and 7 from the drilling fluid in the well, which

0 should not get into the following chamber 7 before the well is mastered and it switches to gas. In the sleeve 8 is made of a longitudinal channel 10 with the calibrated destructible diaphragm 12 installed in it (FIG. 2). When the well is drilled, the pressure in the tubing cavity after the replacement of the drilling fluid begins to increase, and with the calculated gas pressure, the diaphragm 12 breaks through, the cut off part of it is trapped in the annular groove

0 11. This groove is connected to the annular chamber 6 by means of longitudinal channels 9. The tracking chamber 7 is filled with produced gas. With a sharp drop in pressure in the axial bore

5, the stepped piston 5 begins to move upwards as far as it will go, while the spring-loaded damper 4 rotates and sits down on the valve body seat 3 (FIG. 3). In an emergency situation, when there is no sharp drop in pressure in the cavity of the production tubing (fistula formation, cracks, etc.), it is necessary to ensure the forced closure of the channel. For this, a control chamber 13 is provided, in

5 which, from the wellbore, is fed through the channel 18 and the impulse pipe 19 to an overpressure. When the product pressure exceeds the piston area above the gas pressure from the top of the piston 5 from the elevator cavity, the piston 5 will move up and the valve 4 will block the well. To open the closed valve, the gas pressure from the loop is supplied to the lift cavity above the valve. Piston 5 will start

5 move downward, opening the shutter 4 at a pressure above the shutter 4 less than underneath.

For the final pressure equalization, excluding the breaking of the valve axis 14, the latter is thus made (Fig. 3).

and 4) that the lower end of the piston 5 first contacts the edge of the flap 4 (as shown in FIG. 3), ensuring the latter rotates around a new axis of rotation formed on the surface of the seat 36, the support point 16, which is formed by an elliptical gap in the bore 15. At When the end face reaches the piston 5 and the flap position shown in FIG. 4, the gas will flow into the cavity above the flap and the pressure will equalize, after which the piston 5 will move down to the stop, turning the unloaded flap 4 to the open position.

Claims (1)

Claims for gas well shutoff valve, comprising a housing with an axial channel, with throttling means and a seat, a locking member in the form of a spring-loaded disk-type damper with a control unit including an axially mounted axially displaced member in the housing with a locking member channel forming with the housing sequentially placed and hydraulically connected to each other and with the axial channel an annular chamber and a tracking chamber, and means for supplying a force agent, characterized in that with the aim of increasing the efficiency and operational reliability of the operation by providing the possibility of automatically switching it on while simultaneously reducing the pressure in the tracking chamber when the closure member is closed, supplied hosted in the lower part of the housing under the valve body with the ability to interact with the lower degree of the piston sealing sleeve with axial and longitudinal channels, hydraulically connected with the annular chamber and the axial channel of the housing below the level of the valve body, with an annular groove for hydraulic communication of the longitudinal channels and with a calibrated diaphragm destroyed installed in a longitudinal channel under the annular groove; the means for throttling is placed between the servo and annular chambers, the piston stages having diameters decreasing in the direction a control chamber with means for supplying a power agent is formed between the closure member, and between the housing, the upper and middle stages of the piston. nineteen FIG. 3 Fy FIG. 2