RU204960U1 - SHUT-OFF VALVE FOR UNDERGROUND WELL REPAIR - Google Patents

Abstract

The utility model relates to the field of hydrocarbon production and can be used for underground workover of wells equipped with electric submersible pumps. The technical result is to ensure the possibility of controlled shutdown of the productive part of the formation, eliminating the harmful effect of process fluids on the bottomhole zone of the productive formation. maintaining well productivity during underground repairs. Reliability is ensured due to the hermetic separation of the above-packer and below-packer zones of the formation, which makes it possible to reduce the risk of gas and oil water seepage and the ingress of process fluid into the bottomhole formation zone.

Description

The utility model relates to the field of hydrocarbon production and can be used for underground workover of wells equipped with electric submersible pumps.

Known shut-off valve (patent RU No. 2672898, publ. 20.11.2018), including a housing, the inner cavity of which is divided into chambers for discharge, drain and spring installation, a saddle installed in the discharge chamber, a shut-off element placed in the drain chamber, pressed against the saddle by a spring through the rod, which is installed in the hole of the inner baffle of the body, separating the drain chamber and the spring installation chamber. An annular protrusion is made on the rod, contacting with the body below the inner baffle of the body. Above the annular protrusion of the rod there are lateral channels that communicate with the pressure chamber through an axial channel made in the rod and the shut-off element. The upper end of the stem is blind. A collet is installed in the drain chamber, the heads of the petals of which rest on a tapered bushing fixed to the rod. The saddle is mounted on a threaded bushing fixed in the body and pressed from above by an elastic element and a nut connected to the body, thereby having the possibility of limited axial movement upward.

The disadvantage of this design is that the spring, installed in the inner cavity of the body, is not adjustable in compression ratio, as a result of which complications arise when working in various mining conditions.

Known borehole shut-off valve (patent RU No. 2651860, publ. 24.04.2018), including a housing with radial outlet windows, a stepped bushing, a locking element, a drive in the form of a chamber and a rod having the possibility of limited reciprocating axial movement. In the housing below the radial outlet windows, inlet radial windows are made. The stepped sleeve is installed on the body with the formation of an annular gap between them, communicating with the body cavity through the inlet radial windows. The locking element is installed on the rod with the possibility of overlapping the radial inlet windows of the housing in the upper position of the rod. The body is closed from below with a plug, while the body cavities above and below the closure element are hydraulically connected through longitudinal channels in the body of the latter.

The disadvantage of this design is that the sealing elements of the locking unit when the piston moves to the open or closed position are deformed and lead to failure of the device.

Known control bypass valve (patent RU No. 2610953, publ. 02/17/2017), including the upper and lower subs with a cylindrical cavity, a hollow body, placed between the sub, is made with a radial through hole, a spring-loaded piston, on the surface of which a figured controllable groove is made, a control pin, a nozzle located in the piston under the upper sub, a glass, a drain plug, a bearing, O-rings and their corresponding grooves in the glass, upper and lower subs, a spiral spring that bolsters the piston.

The disadvantage of this design is that the coil spring is not protected from the ingress of mechanical impurities from the annular space, which leads to its jamming and, consequently, failure of the device.

Known mechanical cut-off valve (patent RU No. 2738553, publ. 12/14/2020), taken as a prototype, including a body, a saddle installed inside the body with a ball made with an axial hole, a collet, a pusher, with which the valve is opened or closed -splitter. A piston is installed inside the housing with the possibility of communicating its radial channels with the holes of the upper and lower seats. The piston is connected to the collet through strips that transmit rotation to the ball through crackers installed in the grooves of the ball. The pusher in the lower part has an external protrusion interacting with the upper collars of the collet when removing the pusher from the body to close the shut-off valve and with the lower collars of the collet when installing the pusher into the housing, moving the collet to the upper and lower positions, respectively.

The disadvantage of this design is that the execution of the connections of the piston, strap, collet, cracker and ball is made using flexible joints, as a result of which there are foci of an increased stress-strain state and depressurization of the radial channels between the piston and the lower seat, which leads to valve failure. cutter.

The technical result is to provide the possibility of controlled shutdown of the productive part of the formation, excluding the harmful effect of process fluids on the bottomhole zone of the productive formation.

The technical result is achieved by the fact that a stinger is additionally installed, on the surface of which perforations are made at the same distance from each other, and a pressure-acting valve assembly is installed in the inner cavity, and the spring is fixed inside the saddle and one end is connected to the ball, and the other to the bottom of the saddle ...

A shut-off valve for well workover is illustrated by the following figures:

fig. 1 is a block diagram of a downhole shut-off valve;

fig. 2 - push-action valve assembly, where:

1 - control station;

2 - pumping and compressor pipes (tubing);

3 - power cable;

4 - fastening belts;

5 - electric submersible pump;

6 - electric motor;

7 - pusher mechanism;

8 - stinger;

9 - perforations;

10 - packer assembly;

11 - shut-off element;

12 - productive formation;

13 - stock;

14-tapered neck;

15 - ball;

16 - spring;

17 - channels;

18 - saddle.

The shut-off valve contains a stinger 8 (figure 1), on the surface of which perforations 9 are made at the same distance from each other. The stinger 8 is connected to the pushing mechanism 7 by a threaded connection and is coaxially located in the packer assembly 10. The packer assembly 10 is mounted using an expandable rubber cuff (not shown in the figures). The locking element 11 is fixed in the body of the packer assembly 10 in the longitudinal grooves. The locking element 11 is made in the form of a ball mechanism and is sealed with the walls of the stinger 8. In the inner cavity of the stinger 8, a push-action valve assembly is installed (Fig. 2), which includes a rod 13 connected to a pusher mechanism 7, and a ball 15. Ball 15 is connected to spring 16, for example, by spot welding. The spring 16 is installed inside the seat 18, and is rigidly fixed to the bottom. On the end surfaces of the saddle 16, channels 17 are made. The saddle 18 is connected to the surface of the stinger 8, for example by butt welding. The connection of the inner surface of the stinger 8 and the tapered neck 14 is carried out, for example, by butt welding.

The device works as follows. Oil entering the well from the productive formation 12 moves from the sub-packer zone into the inner cavity of the stinger 8. The rod 13 is in the extreme lower position. Passing through the stinger 8, oil through the perforations 9 enters the above-packer zone and goes to the intake of the electric submersible pump 5.

To turn off the productive part of the formation, a command is sent from the control station 1 through the power cable 3 to the electric motor 6. The pushing mechanism retracts the rod 13, while the ball 15 rises with the help of the spring 16, overlapping the flow section of the tapered neck 14 and, accordingly, the stinger 8. The above-packer zones are reliably insulated.

To extract underground equipment, the wellhead is depressurized. The electric submersible pump 5 and the electric motor 6 are removed together with the pusher mechanism 7 and the stinger 8 attached to it. When the stinger 8 is removed from the packer assembly 10, the shut-off element 11 is automatically closed.

If it is necessary to conduct research or treatment of the productive formation 12, the tubing string 2 is lifted with the simultaneous removal of the fastening belts 4 and the extraction of the power cable 3. Next, the electric submersible pump 5 and the electric motor 6 are dismantled. After that, the tubing string 2 with a hollow stinger is lowered into the well fixed at the end of this column. When entering and sealing the hollow stinger in the inner cavity of the packer assembly 10, the hollow stinger interacts with the elements of this assembly 10, which open the shut-off element 11, which ensures further passage of the hollow stinger and the tubing string into the sub-packer zone. Thus, a sealed channel is realized from the sub-packer space to the wellhead.

The use of the claimed device will allow maintaining the productivity of the well during underground repairs due to the structural design of the push-action valve assembly and the shut-off element of the packer assembly, which allow to reliably isolate the sub-packer and above-packer spaces.

Claims (1)

A shut-off valve for underground workover, including a shut-off element, a packer, a pusher and a perforated branch pipe, characterized in that a stinger is additionally installed, on the surface of which perforations are made at the same distance from each other, and a push-action valve assembly is installed in the inner cavity, and the spring is fixed inside the saddle and is connected to the ball at one end and to the bottom of the saddle at the other.

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