Coal bed methane extraction method based on directional drilling and liquid nitrogen freezing heat cracking

A technology for gas extraction and coal seam gas, which is applied in the field of gas control, can solve the problems of fast decay of gas extraction volume, etc., and achieves the effects of high technology and economy, simple construction and good extraction effect.

Active Publication Date: 2019-12-27
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a method of coal seam gas extraction based on directional drilling and liquid nitrogen quick freezing and thermal fracturing to solve the problem of high gas or coal and gas outburst gas in the mining face The problem of rapid decay of extraction volume

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  • Coal bed methane extraction method based on directional drilling and liquid nitrogen freezing heat cracking
  • Coal bed methane extraction method based on directional drilling and liquid nitrogen freezing heat cracking
  • Coal bed methane extraction method based on directional drilling and liquid nitrogen freezing heat cracking

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Embodiment Construction

[0032] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.

[0033]Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should ...

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Abstract

The invention relates to a coal bed methane extraction method based on directional drilling and liquid nitrogen freezing heat cracking, and belongs to the technical field of methane treatment. An inclined drill hole is formed in the upper roadway of the extraction work face, and the inclined drilled hole is merged into an extraction pipe network to be subjected to methane extraction; after the work face methane extraction amount is attenuated, the inclined drill hole is detected, a drill hole with extraction failure is marked, meanwhile, a long-distance orientation drill hole is constructed ina retracement channel or air return main roadway of the extraction work face in the coal seam direction to serve as a liquid nitrogen injection hole, liquid nitrogen is injected into the long-distance orientation drill hole, through detection of the temperature in the drill hole marked as extraction failure, whether the drill hole is a liquid nitrogen influence hole or not is judged, if the holeis the liquid nitrogen influence hole, high-temperature air is injected into the drill hole, and the coal around the drill hole is cracked under the freezing heat condition, and the coal permeation characteristics are improved. The methane extraction amount is improved, the process is simple, and the work cost is low.

Description

technical field [0001] The invention belongs to the technical field of gas control, and relates to a coal seam gas extraction method based on directional drilling and liquid nitrogen quick-freezing and thermal cracking. Background technique [0002] The coal industry provides an important support for economic and social development. Although the new energy industry is in the ascendant, its current market share is relatively small, which has not shaken the main advantage of the coal industry. Coal mine gas (also known as "coalbed methane") is a kind of unconventional natural gas associated with coal and mainly stored in coal seams in the state of adsorption. Its main component is methane, with a small amount of ethane, propane and butane, generally Contains hydrogen sulfide, carbon dioxide, nitrogen and moisture, and traces of inert gases such as helium and argon. Gas is the main factor that threatens the safe production of mines, but it is also a kind of clean energy. As ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B47/00E21F7/00
CPCE21B43/006E21B43/26E21B47/00E21F7/00
Inventor 程波邹银辉王振向衍斌张锋黄光利颜文学杨亮彭明辉邓鹏杨森秦玉兵马智勇何显能刘辉魏宏宇舒海
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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