Method for promoting gas extraction and working face dust fall by injecting water at intervals in drilling holes

Abstract

The invention discloses a method for promoting gas extraction and working face dust fall by injecting water at intervals in drilling holes. In an influence scope of advanced support pressure at a coal mining working face, high pressure water injection is performed, at intervals, on parts of the gas extraction drilling holes of a floor roadway. Intense extraction of advanced pressure relief gas is promoted in the gas extraction drilling holes adjacent to the water injection drilling holes by using a displacement role of the high pressure water to coal seam gas and a pressure relief and fluid increase effect of the coal seam gas at an advanced support pressure relief segment at the coal mining working face. The high pressure water fully permeates the coal body by using a character that coal body fractures are more developmental in the influence scope of the advanced support pressure at the coal mining working face. The flying capacity of original coal dust in the coal body is eliminated. The generation amount of the coal dust is reduced. The dust fall of the working face is promoted. A dilemma that the advanced pressure relief gas extraction at the high gas working face and the coal layer water injection and dust fall cannot be both considered is solved. The advanced pressure relief gas extraction is realized, and a target of effective dust fall at the working face is realized too.

Description

technical field [0001] The invention relates to a method for injecting water into interlayer drilling holes to promote gas extraction and working face dust reduction. Background technique [0002] For high gas mines or coal and gas outburst mines, in accordance with the requirements of laws and regulations on the prevention and control of coal seam gas disasters, coal seam gas must be pre-pumped for a certain period of time to reduce the gas content of coal seams and ensure safe mining of coal mining faces. Among them, arranging a large number of drill holes in the coal seam to pre-extract coal seam gas is one of the effective methods to prevent and control gas disasters in high gas mines or coal and gas outburst mines before mining at the working face. [0003] However, some high-gas mines use fully-mechanized caving mining methods for coal mining. During the production process of the coal mining face, there are problems of coal dust pollution in the working face space and ...

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a method for promoting gas drainage and dust reduction in the working face by injecting water at intervals in drilling through layers, eliminating the flying ability of the original coal dust in the coal body, and reducing the generation of coal dust reduce the amount of dust at the working face, and solve the dilemma that the gas drainage of the high-gas working face and the coal seam water injection for dust reduction can not be taken into account at the same time. It not only realizes the extraction of the gas at the working face ahead of the pressure relief, but also realizes the effective dust reduction of the working face. Target

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