Gas control method for triple-purpose use of drilled holes in coal floor of close distance seam group

Abstract

The invention discloses a gas control method for triple-purpose use of drilled holes in a coal floor of a close distance seam group, and belongs to coal mine gas control methods. In the coal floor of a mine, drilled holes in the same drill site are used, and gas extraction is performed according to the steps as follows: firstly, before coal mining, gas in a coal seam is extracted in advance through the drilled holes in the coal floor of the mine, and danger of the outburst of coal in the coal seam at the upper part and the gas is eliminated; secondly, the coal at the upper part is mined, when the coal seam at the upper part is mined, mining pressure relief and stress relief are caused to coal seams at the upper part and in the middle, the drilled holes of the original drill site are used, and gas in the coal seams at the upper part and in the middle in a mining pressure relief zone is extracted in a negative pressure manner; and finally, the coal seam in the middle and the coal seam at the lower part are mined, and simultaneously, the original drilled hole is used again, and gas in a mining layer is extracted in the negative pressure manner. The work efficiency can be improved, the gas extraction efficiency is high, the cost is saved, the concentration of the extracted gas is high, and the utilization of the gas is facilitated. The gas control method comprises the control of gas in close distance seam groups of two or more coal seams.

Description

technical field [0001] The invention relates to a method for controlling coal mine gas, in particular to a method for controlling gas in which one hole is used for three purposes in the bottom extraction roadway of a group of close-distance coal seams. Background technique [0002] Coal mine gas is one of the main disasters that threaten the safe production of coal mines, but at the same time, gas is a kind of clean energy with very abundant reserves. Nowadays, most coal mines in my country are preventing and controlling gas disasters through drainage, which can not only achieve safe production in coal mines, but also make rational 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 underground in a coal mine, and a drilling rig is used to drill holes along the coal seam or drill through layers, and then connect the constructed boreholes with the gas ex...

AI Technical Summary

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

Images