Gas control method for drilling one hole and three purposes in the bottom pumping roadway of close-distance coal seam group

Abstract

The utility model relates to a gas control method in which one hole and three functions are drilled in the bottom pumping roadway of a group of close coal seams, which belongs to the gas control method of coal mines. In the mine bottom extraction roadway, the boreholes in the same drilling site are used for gas drainage in the following stages: first, before the coal seam is mined, the gas in the coal seam is pre-drained through the drill holes in the mine bottom extraction roadway drilling site, and the gas is eliminated. The danger of coal and gas outburst in the upper coal seam; secondly, when the upper coal seam is mined, the mining pressure and stress release of the lower coal seam and the middle coal seam will be caused by mining the upper coal seam, and the original drilling site will be used to extract the gas in a negative pressure way The gas in the middle coal seam and the lower coal seam in the mining pressure relief zone; finally, the middle coal seam and the lower coal seam are mined, and at the same time, the gas in the mined-out area of ​​the mined-out seam is extracted again by using the original borehole in a negative pressure manner. It can improve work efficiency, high gas extraction rate, cost saving, high concentration of gas extraction, and facilitate the utilization of gas. Gas control of close coal seam groups containing two or more coal seams.

Description

Technical field [0001] The invention relates to a gas treatment method for coal mines, in particular to a gas treatment method with one hole for three purposes in short-distance coal seam group bottom extraction roadway drilling. Background technique [0002] Coal mine gas is one of the main disasters threatening coal mine safety production, but at the same time gas is a kind of clean energy with abundant reserves. Nowadays, most coal mines in our country are using gas extraction to prevent and control gas disasters, which can not only realize coal mine safety production, but also make reasonable use of the extracted gas to reduce energy loss. [0003] At present, many mines adopt the method of underground drilling for gas extraction, that is, a drilling site is set up in the coal mine, and the drilling rig is used to drill along the coal seam or through the layer, and then the constructed drilling and the drainage in the roadway The mining pipelines are connected, and the coal se...

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Problems solved by technology

[0004] However, at present, the function of drainage drilling in underground coal mines is relatively simple, and the actual maintenance is not strong enough. Usually, after the gas in a coal seam is drained, if you want to pump gas in other coal seams or goafs, etc., you have to reinstall the gas. Drilling, especially in the gas control of close coal seam groups, not only increases the workload but also costs a lot

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