RU2498046C2 - Wellhead equipment for coal-methanol wells - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: wellhead equipment for coal-methanol wells includes housing with channel for communication with cavity of tubing string. There are also two channels for communication with tubular annulus, valves and adjustable chokes. The channel contains channel for communication of water line with gas line additionally. The housing is equipped with threaded coupling with casing head and valves are equipped with pressure gages installed on them.

EFFECT: simplifying of operation and maintenance of coal-methanol wells, including low-temperature conditions, reducing specific amount of metal per structure.

1 cl, 1 dwg

Description

The invention relates to valve engineering, in particular to wellhead valves, and can be used in the extraction of methane from coal seams.

The known scheme of fountain fittings for gas wells (GOST 13846-89. Fountain and pressure fittings. Typical schemes, basic parameters and technical requirements for the design), comprising a pipe head housing with two lateral branches.

However, the reinforcement made according to this scheme cannot be used at low temperatures due to its vulnerability to freezing, and the fountain fittings for gas wells have large dimensions in height, which makes their maintenance and operation inconvenient.

Known wellhead reinforcement (RF Patent No. 2168605, IPC ЕВВ 33/03, publ. 06/10/2001), comprising a housing with a communication channel with a cavity of tubing, a communication channel, with annular space, shut-off bodies installed in the said communication channels .

However, this design does not have a duplicate communication channel with the annular space of the cable entry and its operation is possible only during oil production, and the wellhead reinforcement is unprotected from freezing and has excessive metal consumption due to fastening to the column head using a flange connection.

Closest to the claimed technical solution is horizontal fountain fittings (RF Patent No. 2339788, IPC ЕВВ 33/03, publ. 2008.11.27), comprising a tube head housing with two communication channels with annular space, a communication channel with a tubing cavity, gate valves, adjustable throttles.

However, this design has excessive metal consumption due to fastening to the column head using a flange connection, in addition, methane extraction of coal seams does not require the injection of methanol through the backup communication channel with the tubing, due to the large overall dimensions in height, maintenance and operation are complicated, and also horizontal fountain fittings are unprotected from freezing.

The technical result of the invention is to facilitate the maintenance and operation of methane wells, including at low temperatures, reducing metal consumption.

The specified technical result is achieved by the fact that in the wellhead for methane wells, which includes a housing with a communication channel with a cavity of the tubing, two communication channels with annular space, valves, adjustable chokes, according to the invention, it further comprises a channel of communication of the water line with the gas line , the body is equipped with a threaded connection to the column head, and the valves are made with pressure gauges installed on them.

The invention is illustrated in the drawing, which shows a General view of the wellhead for methane wells.

Wellhead for methane wells includes a housing 1 with a communication channel 2 with a cavity of the tubing, two communication channels 3 and 4 with an annulus, a communication channel 5 of a water line 6 with a gas line 7, a cable entry 8 for the cable of the submersible telemetry system. Spherical cranes 9 are installed in the communication channels 2, 3, 4, 5, adjustable chokes 10 are installed on the water line 6 and gas line 7, plugs on quick connectors 11, valves 12 with the possibility of installing pressure sensors on them, pressure gauges 13. Housing 1 is installed on the column head by means of a threaded connection 14.

Water through the communication channel 2 with the cavity of the tubing enters through the spherical valve 9 into the water line 6, where the flow is regulated by an adjustable throttle 10. Gas through the communication channels 3 and 4 with the annular space flows through the spherical valve 9 into the gas line 7, where the flow is regulated by an adjustable throttle 10. The communication channel 4 with the annular space is a backup and serves to measure the liquid level in the well by a borehole level gauge.

To remotely control the pressure in the annulus, valves 12 are provided, made with pressure gauges 13 mounted on them.

To facilitate the use of the well at low temperatures, a communication channel 5 is provided for the water line 6 with the gas line 7, which makes it possible to clean the water line 6 with a gas stream during freezing.

To control the flow of water and gas, there is no need to use special service areas. To do this, use adjustable chokes and spherical cranes, which facilitates the maintenance and operation of valves.

Thus, wellhead fittings for coal wells can facilitate maintenance and operation by reducing overall dimensions in height, implementing a method for remote monitoring of gas pressure in the annulus, reduce the total metal consumption by installing the housing on the column head by means of a threaded connection, and facilitate the use of the well at low temperatures due to the channel of communication of the water line with the gas line, which allows cleaning the water line with a gas stream during freezing.

Claims (1)

Wellhead fittings for methane wells, including a housing with a communication channel with a tubing cavity, two communication channels with annular space, valves, adjustable chokes, characterized in that it further comprises a water channel communication channel with a gas line, the housing is equipped with a threaded connection with column head, and the valves are made with pressure gauges installed on them.

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