Coalbed methane extraction system and construction method

Abstract

The invention discloses a coalbed methane extraction system and a construction method. The coalbed methane extraction system comprises a communicating expansion cavity, a discharge and mining pipeline and a pumping well, wherein the communicating expansion cavity is used for collecting coalbed methane from a coalbed and is arranged in the coalbed; the discharge and mining pipeline is paved along the extending direction of a roadway, is a negative pressure pipeline and comprises an output end used for outputting the coalbed methane, the output end extends to the ground surface, the tail end of the pumping well is communicated with the communicating expansion cavity, and the head end of the pumping well is communicated with the discharge and mining pipeline. The invention further provides the construction method of the coalbed methane extraction system to construct the coalbed methane extraction system. According to the provided coalbed methane extraction system and the construction method, the energy consumption is reduced, the extraction cost of the coalbed methane is lowered, the cost for ground construction is lowered, and the operation cost for a drilling well is lowered.

Description

technical field [0001] The invention relates to the technical field of coalbed methane exploitation, in particular to a coalbed methane extraction system and a construction method. Background technique [0002] Coalbed methane, commonly known as gas, is unconventional natural gas. Coal bed is not only the source rock of coalbed methane production, but also the reservoir of coalbed methane. Generally, special extraction technology is required to extract coalbed methane and use it as energy. [0003] In the prior art, coalbed methane in coal mines is generally exploited by techniques such as vertical well drainage, cluster well drainage, and ground U-shaped connected well drainage. During the mining process, it is necessary to set up a separate suction device on the ground to extract coalbed methane, which increases the cost of coalbed methane suction and increases energy consumption; secondly, the pipeline network system and supporting facilities for transporting coalbed meth...

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Problems solved by technology

[0003] In the prior art, coalbed methane in coal mines is generally exploited by techniques such as vertical well drainage, cluster well drainage, and ground U-shaped connected well drainage. During the mining process, it is necessary to set up a separate suction device on the ground to extract coalbed methane, which increases the cost of coalbed methane suction and increases energy consumption; secondly, the pipeline network system and supporting facilities for transporting coalbed methane need to be laid on the ground , which increases the cost of ground construction; thirdly, the drilling is a channel for coalbed methane extraction, and regular maintenance is required for the drilling during the extraction process, which increases the operating cost of the drilling

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