A device and method for determining the horizon of gas-occurring rock formations in overlying rock strata

Abstract

A device and method for determining the stratum of gas-occurring rock formations in an overlying rock stratum. The device includes a grouting protection pipe, a grout return pipe, a gas collection hood, a drainage pipeline, a gas concentration probe, a substation, and a downhole tablet computer. The gas collection hood is installed at the hole of the borehole, and a grouting protection pipe and a grout return pipe are arranged in the borehole. The gas collection hood is connected to one end of the extraction pipeline through a flange. A second stop valve and a gas concentration probe are installed on the drainage pipeline, and the second stop valve is set closer to the gas collection hood than the gas concentration probe. The station is connected to the downhole tablet computer, and the other end of the drainage pipeline is connected to the drainage supervisor. The device is simple in structure, easy to operate and low in cost. It can simply and effectively determine the stratum where the gas occurs, and provides solid data support for optimizing the extraction parameters. Safe recovery.

Description

technical field [0001] The invention belongs to the technical field of gas occurrence in rock formations, and in particular relates to a device and a method for determining the stratum level of gas occurrence in overlying rock formations. Background technique [0002] With the increase of mine mining depth and mining intensity, the amount of mine gas emission has gradually increased. Coal mine gas disasters have become the most important threat to the safe production of coal mines in my country and the most important factor restricting the sustainable development of the coal industry. Usually, gas exists in coal seams in two states: free and adsorbed, but in the actual production process, gas occurs in rocks from time to time. Affected by coal seam gas, it is difficult to determine the rock formation where the gas occurs, resulting in a lack of basis for the design of gas drainage boreholes, and the inability to accurately extract rock formation gas. The drainage effect is n...

AI Technical Summary

Problems solved by technology

Usually, gas exists in coal seams in two states: free and adsorbed, but in the actual production process, gas occurs in rocks from time to time. Affected by coal seam gas, it is difficult to determine the rock formation where the gas occurs, resulting in a lack of basis for the design of gas drainage boreholes, and the inability to accurately extract rock formation gas. The drainage effect is not good, which seriously affects the safety of the mining face. Safe recovery

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