Device integrating leakage detection and sealing of gas extraction drill hole

Abstract

The invention discloses a device integrating leakage detection and sealing of a gas extraction drill hole. The device includes shallow hole extraction pipes, a filling pipe, a gas extraction pump anda pressurizing injection pump, wherein the filling pipe, the gas extraction pump and the pressurizing injection pump are communicated with a three-way pipe separately. The filling pipe stretches intothe drill hole in coal rock, and a fixing assembly is arranged in a gap between the filling pipe and the drill hole; an exploring tube is arranged in the filling pipe, one end of the exploring tube stretches out of the filling pipe, and a filtering net cover is installed outside the filling pipe and the exploring tube; the exploring tube stretches into the three-way pipe and penetrates out of a detection hole in the upper portion of the three-way pipe to be connected to a gas analysis instrument; the shallow hole extraction pipes are arranged on the two sides of the filling pipe, installed inshallow holes and communicated with an adjusting pump. The device integrates leakage detection and sealing of the gas extraction drill hole, the gas extraction efficiency is effectively improved, andthe extraction safety of the drill hole is ensured. The device is simple in structure, convenient to use, low in input cost, high in treatment efficiency and great in sealing effect.

Description

technical field [0001] The invention relates to the technical field of coal gas extraction, in particular to an integrated device for leak detection and plugging of gas extraction boreholes. Background technique [0002] The correct prevention and control of gas disasters is of great significance to the safe production of coal mines. In the engineering practice of gas prevention and control, the coal seam gas pressure must be accurately obtained first, followed by efficient coal seam gas drainage; coal gas drainage is to reduce the amount of mine gas gushing out and prevent gas explosions. It is also an important measure for coal and gas outburst disasters. At the same time, as a kind of unconventional natural gas, gas is also a valuable energy wealth. However, the current situation of large fluctuations in extraction concentration results in the difficulty of fully utilizing gas and the low utilization rate of gas. Moreover, due to the negative pressure of more than 30Kpa i...

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Problems solved by technology

[0002] The correct prevention and control of gas disasters is of great significance to the safe production of coal mines. In the engineering practice of gas prevention and control, it is first necessary to accurately obtain the pressure of coal seam gas, and then to efficiently extract coal seam gas; coal gas drainage is to reduce the amount of mine gas gushing out and prevent gas explosions. It is an important measure for coal and gas outburst disasters. At the same time, as a kind of unconventional natural gas, gas is also a kind of precious energy wealth. However, the current situation of large fluctuations in the extraction concentration has made it difficult to fully utilize the gas and the gas utilization rate is low. Moreover, due to the negative pressure of more than 30Kpa in the gas drainage pipeline, coal and other sundries are easily sucked into the pipeline, affecting the smoothness of the gas drainage pipeline; most of the methods currently used for gas pressure measurement use capsule mucus measurement. According to the research and analysis of the pressure method, when the coal seam gas pressure exceeds 4Mpa, the structure of the pressure measuring device will be squeezed and deformed, and even the entire pressure measuring device will pop out of the borehole, so that the accurate measurement of the high-concentration gas pressure cannot be realized; in addition, The current drilling hole sealing method is to only measure the gas pressure or gas drainage for a drilling hole, which increases the amount of drilling construction and wastes time and consumables

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