Underground coal seam gas pressure testing and hole sealing device and method

Abstract

The invention discloses a coal mine underground coal seam gas pressure testing and hole sealing device and method which are suitable for direct measurement of coal mine underground coal seam gas pressure under complex geological conditions. The testing system device comprises an orifice pipe, a cylindrical drill bit, a hole sealing material, a pressure measuring pipe, a grouting pipe, a grout return pipe, a pressure gauge, a grouting pump and a flange plate. The basic method comprises the steps that firstly, a large-diameter drill bit is selected for drilling, an orifice pipe A is driven for primary grouting pipe fixing, a small-diameter drill bit is selected for continuous drilling after grout is solidified, an orifice pipe B is driven for secondary grouting pipe fixing again, a pressuregauge connector is welded to the pipe wall of the orifice pipe B, and a pressure gauge is screwed; then a cylindrical drill hole is selected for continuous drilling to a coal seam, and a grouting pipe, a pressure measuring pipe and a grout return pipe are lowered down, and then grouting and sealing are carried out on the cylindrical drill bit; and finally the pressure representation is read to obtain the pressure of the coal seam. By means of hole sealing through the method, coal mine underground coal seam gas pressure measurement hole sealing can be achieved, surrounding rock of drilled holesis stabilized and sealed, the sealing performance is good, and the coal seam pressure measurement efficiency and accuracy are improved.

Description

technical field [0001] The invention relates to a gas pressure sealing device and method for underground coal seam testing, which is suitable for direct measurement of coal seam gas pressure in coal mines under complex geological conditions. Background technique [0002] In my country's coal mine production, coal and gas outburst disasters seriously threaten the safety of coal mine production and the safety of workers. It is an important measure to prevent coal mine gas disasters and enhance mine production safety by measuring the gas pressure in coal seams and evaluating the danger of coal and gas outburst by drilling outburst prevention holes. my country's gas outburst prediction methods can be divided into three categories: traditional contact prediction methods, emerging non-contact prediction methods, and modern mathematical theory methods. Among them, non-contact gas outburst predictions are all realized through drilling. Coal seam gas pressure test method commonly use...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a gas pressure sealing device and method for underground coal seam testing in view of the problems existing in the existing coal mine gas pressure testing technology and method

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