A combined extraction method and system for coal seam gas and adjacent goaf gas
A coal seam gas and gas extraction technology, applied in the field of coal mine gas extraction, can solve the problems of increased cost, waste of manpower and material resources, etc.
Active Publication Date: 2021-04-06
宁夏煤炭勘察工程有限公司
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Problems solved by technology
[0005] This application provides a coal seam gas and adjacent goaf gas combined drainage method and system to solve the problem that the existing coal seam gas and adjacent goaf gas are extracted separately, which wastes a lot of manpower and material resources and increases costs. The problem
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[0032] In order to make the above objects, features and advantages of the present application more obvious and comprehensible, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0033] This application provides a coal seam gas and adjacent goaf gas combined drainage method and system to solve the problem that the existing coal seam gas and adjacent goaf gas are extracted separately, which wastes a lot of manpower and material resources and increases costs The problem.
[0034] In the first aspect, the embodiment of the present application provides a combined drainage method of coal seam gas and adjacent goaf gas, the method is completed by a drilling rig, and the method includes:
[0035] Set up at least one docking drill field vertically at the edge of the preparation roadway in the coal mine; the effect of the docking drilling field is to drill a 40-80m butt drilling hole from...
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The embodiment of the present application discloses a coal seam gas and adjacent goaf gas combined drainage method, through the horizontal directional drilling set in the coal seam gas layer extending to the ground to form a horizontal directional well, and the horizontal docking in the adjacent goaf Wells and conventional directional wells extend to the ground to form goaf surface vertical wells, connect the horizontal directional wells with the control gate valves set in the middle of goaf surface vertical wells, and use the original gas pumping pipes connected to the gas drainage pipelines in the coal mine. Pump and deliver directly to the gas gathering station without additional work. Using the aforementioned extraction method, coal seam gas and adjacent goaf gas are extracted in a combined way, which saves manpower and material resources and reduces costs. Furthermore, the combined extraction is done from the ground, and the existing drainage in the underground roadway of the coal mine can be used. The production pipeline directly transports the produced gas to the gas gathering station, and there is no problem of land occupation.
Description
technical field [0001] This application relates to the technical field of coal mine gas drainage, in particular to a combined drainage method and system for coal seam gas and adjacent goaf gas. Background technique [0002] In the current energy structure, coal has always occupied a dominant position. Coal seams containing coal (i.e. coal mines) generally exist 300 to 500 meters underground. Therefore, coal mining is carried out underground, and its environment is relatively harsh, and major disasters and accidents occur frequently. Coal seam gas is one of the main disasters that endanger the safety of coal production. Coal seam gas is an accompanying product in the process of coal formation and is stored in the coal seam in an adsorbed state. The main component of coal seam gas is methane, which is a clean energy source. However, when the concentration of methane in the coal seam is too high, the oxygen content in the air will be significantly reduced, causing people to su...
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IPC IPC(8): E21F7/00E21B43/00E21B43/30
CPCE21B43/006E21B43/305E21F7/00
Inventor 巫斌伟王建华常力文计生卿王信沙涛梁鹏
Owner 宁夏煤炭勘察工程有限公司