Comprehensive and integrative gas drainage method

Abstract

The invention discloses a comprehensive and integrative gas drainage method which can be used for solving the problems that gas drainage is difficult to realize due to soft coal beds and low air permeability of the existing mines and the drainage effect of the current single gas drainage technology is unsatisfied. The method disclosed by the invention comprises the following steps: (1) high-position fracture borehole drainage of the top plate of a coal bed; (2) heterotropic high-position borehole drainage of a return airway; and (3) upper corner pipe-laying drainage of a gob. According to the invention, the stress field and fracture field caused by mining and a gas migration rule are fully utilized, so that drilled holes are high in drainage efficiency and flexible in arrangement, a drainage system is simple, the gas concentration at a drainage outlet can be up to 15-24%, and the gas drainage efficiency can reach 55-67.3%. The method disclosed by the invention is a new technology and method in fully mechanized caving face gas control methods, can be used for reducing the occurrence of excessive gas accidents and reducing the losses of life and property, has very important and far-reaching significance and is strongly worthy to be popularized and applied.

Description

technical field [0001] The invention relates to a mine gas drainage method, in particular to a comprehensive and integrated gas drainage method. Background technique [0002] my country's energy composition of "rich coal-poor oil-less gas" cannot be changed in the short term. Coal has provided 70%-75% of my country's energy for a long time. Strong guarantee. About 95% of my country's coal is mined underground, and almost all underground coal mines are gas mines. High-gas mines in key state-owned coal mines account for 26.8%, and coal and gas outburst mines account for 17.6%. Among various accidents in coal mines, gas accidents rank first, accounting for about 37%. Gas accidents account for more than 70% of fatal accidents with more than 10 deaths, and more than 90% of fatal accidents with more than 100 deaths. Gas accidents are the main factor causing mass deaths and injuries in coal mines, which have seriously affected the safe production of coal mines, caused huge negativ...

AI Technical Summary

Problems solved by technology

However, when the coal seam is deeply buried, the ground stress is large, and the gas permeability is low, gas drainage is difficult, resulting in a low drainage rate and unsatisfactory effect of the existing gas drainage technology; Coal, loose coal basically fills all the space in the goaf, and there is no storage space for a large amount of gas released from the coal body. In addition, due to the high intensity of coal falling during fully mechanized mining, the corresponding gas emission also increases significantly, which can easily cause the gas in the upper corner to exceed the limit; these not only greatly restrict the safe production of coal mines, but also Serious threat to the safety and health of workers

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