Device and method for detecting sealing quality and gas-leakage position of coal seam gas extraction drill-hole

Abstract

The invention discloses a device and a method for detecting the sealing quality and gas-leakage position of a coal seam gas extraction drill-hole. The device for detecting the sealing quality and gas-leakage position of a coal seam gas extraction drill-hole comprises a quick-connect tee, a detection tube and a gas analyzer, wherein the quick-connect tee is provided with three connecting ports, the gas analyzer is connected with the detection tube, and the quick-connect tee is also provided with a sampling measuring port. The method for detecting the sealing quality and gas-leakage position of a coal seam gas extraction drill-hole is implemented through carrying out detection on different measuring points by using the device for detecting the sealing quality and gas-leakage position of a coal seam gas extraction drill-hole so as to judge the gas-leakage position. According to the invention, through detecting the gas concentrations and extraction negative pressures and the like of positions at different depths in an extraction drill-hole in a detecting negative pressure state, and analyzing the migration rule of gas in the extraction drill-hole, the sealing quality and gas-leakage position of the extraction drill-hole are determined.

Description

technical field [0001] The invention relates to a method for detecting the sealing quality of a coal seam gas drainage borehole and the gas leakage position. Background technique [0002] Coalbed methane, also known as coalbed methane, occurs in coal seams. It is one of the main hazards in the production process of coal mines, and it is also a valuable clean energy. my country's coal seam gas resources are abundant, and the geological reserves of coal seam gas with a depth of less than 2000m are 36.8×104×108m 3 . Gas drainage is a fundamental measure to eliminate major gas accidents in coal mines, and it is also an important measure to obtain clean energy, increase energy supply, and reduce environmental pollution. In 2011, my country's coal mine gas drainage volume was 115×108m 3 , Utilization 53×108m 3 , of which the underground gas drainage volume of the coal mine is 92×108m 3 , Utilization 35×108m 3 . [0003] Due to the large burial depth, low gas permeability, a...

AI Technical Summary

Problems solved by technology

The lengthening of the sealing depth and the enlarging of the sealing material can increase the gas concentration of the drilling hole, but it also brings a series of negative effects, not only reducing the coal seam extraction area, but also making the sealing material Increased cost, complex hole sealing process, and increased labor intensity

At present, due to the lack of detection methods and devices for the sealing quality of coal seam gas drainage boreholes and the location of gas leakage, it is impossible to detect and analyze the sealing quality of drainage boreholes and the location of gas leakage, and it is difficult to accurately determine the reasons for the decrease in gas concentration in drainage boreholes. There is a certain blindness in the determination of the reasonable sealing depth of the drainage drilling

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