Device and method for determining stratum level of overlying overlying strata reserved gas stratum

Abstract

The invention discloses a device and method for determining a stratum level of an overlying overlying strata reserved gas stratum. The device comprises a grouting protection pipe, a slurry return pipe, a gas collection cover, an extraction pipeline, a gas concentration probe, a substation and a downhole tablet computer, wherein the gas collection cover is mounted at an aperture of a borehole, thegrouting protection pipe and the slurry return pipe are arranged in the borehole, a first stop valve is installed at part of an end head of the gas collection cover, and the gas collection cover is connected with one end of the extraction pipeline through a flange; a second stop valve and the gas concentration probe are arranged on the extraction pipeline, and the second stop valve is arranged close to the gas collection cover relative to the gas concentration probe; and the gas concentration probe is connected with the downhole tablet computer through the substation, and the other end of theextraction pipeline is connected with an extraction main pipe. The device is simple in structure, convenient to operate, low in cost and capable of simply and effectively determining the stratum levelof the reserved gas stratum, so that solid data support for optimizing extraction parameters, rock stratum gas can be accurately extracted, and safe stoping of a stoping working face can be guaranteed

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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