RU184281U1 - Wellhead fittings for the development and output of metro-coal wells - Google Patents

Abstract

The invention relates to the field of production of methane from coal seams and can be used in valve industry. Wellhead fittings for development and output to the mode of metro-coal wells includes a housing equipped with a threaded connection with a column head, a channel for communication with the tubing cavity, two channels for communication with the annular space, valves with pressure gauges installed on them, an adjustable throttle on the water line and a channel posts water line with a gas line. It also contains an overflow valve on the gas line. The technical result is to compensate for alternating effects on coal seams, as well as to increase the autonomy and automation of the development and output of the well to a stable mode of operation.

Description

The invention relates to the field of production of methane from coal seams and can be used in valve industry.

The development and bringing to the mode of metro-coal wells is carried out by reducing the pressure of the liquid column in the well below the reservoir pressure to create a depression on the reservoir, due to which the inflow of formation fluid is called. The gradual increase in gas flow rate, as the level of fluid in the well decreases, requires the constant presence of operating personnel to adjust the annular pressure in order to avoid creating excessive back pressure on the reservoir. Also, after reaching the pressure of the start of desorption from the dry coal seams, the accumulation of the desorbed gas occurs. During the day, the number of such gas shows can reach up to 6-8 times, while the annular pressure can vary from 0.5 to 10 atm. The presence of such alternating effects on productive coal seams (periods of depression and repression) have a negative impact on the coal reservoir, subsequently reducing its permeability.

The well-known scheme of the gushing fittings for gas wells (GOST 13846-89. Fountain and pressure fittings. Typical schemes, basic parameters and technical requirements for the design), comprising a body of a tubing head with two side branches.

However, reinforcement made according to this scheme cannot be used at low temperatures due to its exposure to freezing. Fountain fittings for gas wells have large dimensions in height, which makes it inconvenient to maintain and operate. This valve also includes a choke on the gas line, which requires the presence of personnel to adjust the pressure and does not exclude alternating effects on coal seams.

Well-known wellhead armature (Patent RF №2168605, IPC Е21В 33/03, publ. 10.06.2001), comprising a housing with a communication channel with the tubing cavity, a communication channel, with annular space, shut-off members installed in the mentioned communication channels .

However, this design does not have a redundant communication channel with the annular space of the cable entry and its operation is possible only in oil production. The wellhead armature is not protected from freezing and has excessive metal consumption due to attachment to the column head using a flange connection. This valve also requires the presence of personnel to adjust the pressure and does not exclude alternating effects on coal seams.

Famous horizontal flow armature (RF Patent No. 23379788, IPC Е21В 33/03, publ. 2008.11.27), comprising a tubular head body with two channels of communication with the annular space, a channel of communication with the tubing cavity, valves, adjustable throttles.

However, this design has excessive metal consumption due to attachment to the column head using a flange connection. In addition, in the extraction of coal bed methane, the injection of methanol through a redundant channel does not require communication with tubing pipes, and maintenance and operation become more complicated due to the large overall dimensions in height. The horizontal flow valve is not protected from freezing, also requires the presence of personnel to adjust the pressure in the well and does not solve the problem of the influence of alternating effects on coal seams during the period of well development and output them to a stable mode of operation.

The closest technical solution to the proposed utility model is the wellhead fittings for metro-coal wells (RF Patent No. 2498046, IPC EV 21/03, publ. 10.11.2013), comprising a housing with a channel for communication with the tubing, two channels for communication with the annular space, valves, adjustable throttles, and a channel to connect the water line to the gas line.

The disadvantage of this valve is also the need for the presence of personnel to adjust the pressure and the absence of the possibility of eliminating alternating effects on coal seams during the period of well development and bringing them to the mode.

The technical result of the proposed utility model is to compensate for alternating effects on coal seams, as well as to increase the autonomy and automation of the development and output of the well to a stable mode of operation.

This technical result is achieved by the fact that the wellhead fittings for the development and output to the mode of metro-coal wells, including a housing equipped with a threaded connection with a column head, a channel of communication with the tubing cavity, two channels of communication with the annular space, valves with pressure gauges installed on them An adjustable choke on the water line and a channel for communicating the water line with the gas line, according to the proposed description of the utility model, additionally contains a by-pass valve on the gas line.

The invention is illustrated in the drawing, which shows a general view of the wellhead fittings for the development and output to the mode of metro-coal wells.

Wellhead fittings for development and output to the mode of metro-coal wells include body 1 with communication channel 2 with tubing cavity, two communication channels 3 and 4 with annular space, communication channel 5 of water line 6 with gas line 7, cable input 8 for cable submersible telemetry systems. Spherical taps 9 are installed in communication channels 2, 3, 4, 5. An adjustable throttle 10 is installed on the water line 6, plugs 11 are connected to the quick-disconnect connections. The housing 1 is installed on the column head by means of a threaded connection 14. The water through the communication channel 2 the compressor pipes goes through the spherical valve 9 to the water line 6, where the flow is regulated by an adjustable throttle 10. Gas flows through the channels 3 and 4 to the annular space through the spherical valve 9 to the gas line 7. The channel 4 to the annular space is reserved and is used to measure the level of fluid in the well bore gauge. To remotely control the pressure in the annular space, valves 12 are provided with pressure gauges 13 mounted on them. To facilitate the use of the well at low temperatures, a channel 5 of water line 6 to gas line 7 is provided, which allows cleaning the water line 6 with gas flow during freezing.

To compensate for alternating effects during the development of metro-coal wells and bring them to the mode, as well as to increase the autonomy and automate the development and output of the well to a stable mode of operation on the gas line 7, an overflow valve 15 is installed, allowing to regulate the flow and take off excess gas.

Thus, the wellhead fittings with a bypass valve for the development and bringing to the mode of metro-coal wells allows to reduce transportation costs by eliminating the need for operating personnel at the well site to regulate the annular pressure and eliminate alternating effects on coal seams opened by the well, by removing the excess gas with increasing pressure above the installed relief valve.

Claims (1)

Wellhead fittings for development and output to the mode of metro-coal wells, including a housing equipped with a threaded connection with a column head, a channel of communication with the tubing cavity, two channels of communication with the annular space, valves with pressure gauges installed on them, an adjustable throttle on the water line, channel of the water line with the gas line, characterized in that it additionally contains a by-pass valve on the gas line, providing compensation for alternating effects on coal seams, and also increasing autonomy and automating the development and production of a well for stable operation.

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