RU202373U1 - Wellhead check valve - Google Patents

Abstract

The utility model relates to valve engineering, in particular to check valves used in the oil and gas industry. The valve contains a body equipped with inlet and outlet channels and a central blind stepped hole, a seat, a channel for the passage of a conductive medium is located in the valve body, made in one piece with the seat, and having the ability to contact the seat in the "closed" position by a spool, and the spool is installed in the body with the ability to move, opening the passage section of the seat, the seat is made coaxially with the guide surface of the body, on the spool, coaxially of the sealing surface, a guide surface is made that can contact the guide surface of the body, in addition, the spool is equipped with a groove that can equalize the pressure in the cavity under cover and body cavities above the valve, and the cavities are located with the ability to communicate with each other at any position of the spool. The technical result is to increase the service life of the valve and to quickly determine the tightness, as well as to expand the arsenal of technical means. 1 wp f-ly, 1 dwg.

Description

The utility model relates to the valve industry, in particular to check valves used in the oil and gas industry.

The utility model is intended for use in the oil and gas complex as a device that blocks the reverse flow of the transported medium in various process pipelines.

The closest to the claimed technical solution is a single-way valve (patent CN207034284 dated 2018-02-23), which includes a body with an inlet and outlet, a seat, a ball and a baffle located in the buffer cavity. A threaded plug is installed in the upper part of the housing. The disadvantages of this technical solution are:

- there is no residual pressure relief point on the valve, which is unsafe when unscrewing the upper plug;

- when installing an electric centrifugal pump (ESP) on the existing piping of oil wells, the installation of additional flange connections and the use of two O-rings on the flange connections are required;

- during the winter period, the operation of this valve makes it difficult for the accumulation of condensate in the lower part, which can lead to freezing and the removal of this valve from the working state;

- complexity of installation due to the lack of compactness of the valve.

The problem to be solved by the claimed utility model is the development of a check valve with increased tightness and reliability of operation, provided that an aggressive medium is under pressure and at low temperatures.

This problem is solved by the fact that the wellhead check valve contains a body equipped with inlet and outlet openings and a gate, a central stepped hole, a seat for the gate, while the seat is made coaxially with the guide surface of the body, a guide surface is made on the gate coaxially to the sealing surface, which has the ability to contact with the guiding surface of the body.

The technical result, provided by the above set of features, is the equalization of the pressure in the cavity under the valve and above the valve. An additional technical result can be considered an increase in the service life of the valve and the prompt determination of tightness, as well as an expansion of the arsenal of technical means.

The increase in service life is achieved due to the absence of a spring mechanism and the use of a ball with a ring as a plug.

The operative determination of the tightness is achieved due to the lower valve, by means of which the gas is released, namely by closing the annular valve on the check valve, opening the valve and releasing the pressure to atmospheric, there is no liquid flow, which determines the tightness of the check valve and facilitates the work of the maintenance personnel in determining the decrease debit at the well, which also leads to a reduction in the workflow time to one minute.

The device is intended for use directly in the oil and gas industry. The valve is installed on the wellhead tubing and operates automatically without the participation of maintenance personnel.

The utility model is illustrated in the drawing of the general view of the check valve, where:

1 - case,

2 - blind stepped hole,

3 - shutter,

4 - landing saddle,

5 - cover,

6 - cavities under the lid,

7 - cavity in front of the shutter,

8 - adapter,

9 - valve,

10 - guide surface of the body,

11 - valve sealing surface,

12 - gate guiding surface.

The wellhead check valve contains a body 1, equipped with inlet and outlet openings and a central blind stepped hole 2, a gate 3, a saddle 4. A channel for the passage of the conductive medium is located in the body 1 of the gate. The shutter 3 is a steel ball. The valve body is made in one piece with the seat and has the ability to contact in the "closed" position of the valve. The valve is installed in the body with the ability to move, opening the flow area of the saddle. By removing the valve, you can revise the valve body and seat. The saddle is made coaxially with the guiding surface of the body.

The shutter is equipped with a groove, has the ability to equalize the pressure in the cavity under the cover 6 and in the body cavity in front of the shutter 7, and the cavities are arranged to communicate with each other at any position of the shutter.

The saddle is made coaxially with the guide surface of the housing 10, a guide surface 12 is made on the gate coaxially with the sealing surface 11, which can contact the guide surface of the housing 10.

In the upper part of the valve there is a cover 5. The cover 5 is a cylindrical sleeve with a thread. The cover is made of CT45 steel.

The presence of the cover and the shutter allows the valve to be inspected without dismantling and disassembling the flange connections of the Christmas tree.

An adapter 8 with a valve 9 is installed in the lower part of the check valve body, which makes it possible to determine the tightness of the check valve by closing the annular valve and bleeding the pressure in the check valve. In addition, a chemical reagent can be pumped through the valve to dissolve salt deposits. You can also measure pressure through the adapter.

The device works as follows.

The flow of discharged gas from the annular space enters the check valve and, under the action of the gas flow, the gate (steel ball) is lifted from the seat located in the lower part of the check valve, the gas flow is discharged through the upper opening in the check valve. This eliminates the problem of accumulation of the produced well product in the landing seat of the check valve.

The declared check valve has advantages over existing analogues:

- simplicity of design;

- trouble-free operating principle;

- reliable tightness;

- functional efficiency;

- low cost for long-term intensive operation;

- the valve does not freeze at low temperatures in working wells without additional electric heaters and thermal protection;

- provides a quick determination of the check valve tightness;

- high quality of body material and tightness of locking mechanisms;

- product durability;

- ease of installation and maintenance;

- lack of a spring mechanism;

- increased reliability, ensuring operational safety;

- availability of wide functionality;

- when mounted on a Christmas tree, no additional O-rings are required.

In the manufacture of the check valve, expensive and quickly failing materials such as brass, bronze, titanium, high-temperature ferritic steel, non-metallic materials, cast irons, steels (including austenitic, alloyed and stainless steel), corrosion-resistant and heat-resistant Hastelloy and the like, and no rubber or plastic is used.

Due to the use of this valve, the size of the Christmas tree piping is reduced, and the closer the valve is to the production well, the less probability of condensate freezing.

Claims (2)

1. A wellhead check valve, comprising a body equipped with inlet and outlet openings and a gate, characterized in that it is also equipped with a central stepped hole, a seat for the gate, while the seat is made coaxially with the guide surface of the body, a guide surface is made on the gate of the coaxial sealing surface, having the ability to contact with the guide surface of the housing. 2. The wellhead check valve according to claim 1, characterized in that an adapter with a valve is installed in the lower part of the valve.

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