Device and method for shortening coal seam gas pressure measurement observation time

Abstract

The embodiment of the invention discloses a device and a method for shortening coal seam gas pressure measurement observation time, relates to the technical field of coal seam gas pressure measurement, and mainly aims to solve the problems of low gas flow field balance speed and long observation time in the conventional coal seam gas pressure measurement device and method. The device comprises a grouting mechanism, a capsule located in a drill hole, a pressure measuring mechanism, a water conveying mechanism and an expansion liquid conveying mechanism, wherein the surface of the capsule is wrapped with a light, flexible and water-absorbing material, a plurality of sprayers are arranged at the top end of the capsule, and a pressure measuring pipe in the pressure measuring mechanism is fed into the capsule at the front end of the drill hole, so that not only can the pipe be tightly attached to the coal wall around the drill hole before the pressure measuring drill hole is sealed, to hinder flowing of gas in the coal seam around the drilled hole towards the drilled hole, but also can occupy most space of a pressure measuring chamber after the pressure measuring drill hole is sealed, and therefore, the size of the pressure measuring chamber is reduced, the amount of gas flowing into the pressure measuring chamber from the coal wall around the drill hole is reduced, the balance speed of a gas flow field can be increased, and the observation time is shortened.

Description

technical field [0001] The application relates to the technical field of coal seam gas pressure measurement, in particular to a device and method for shortening the observation time of coal seam gas pressure measurement. Background technique [0002] Coal seam gas pressure is a key indicator for mine gas disaster risk assessment (the gas pressure critical value for determining the lower boundary of the gas weathering zone is 0.1-0.15 MPa, and the gas pressure critical value for identifying the risk of coal seam outburst is 0.74 MPa), therefore, obtaining a reliable Coal seam gas pressure data is a key link in the prevention and control of mine gas disasters. [0003] It is a commonly used method to measure coal seam gas pressure by drilling through seams, grouting and sealing holes; however, it takes about 10 hours from the completion of drilling construction to the solidification of the slurry and the start of pressure measurement on the table; during this period, The gas ...

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Problems solved by technology

"Direct Measurement Method of Coal Seam Gas Pressure in Underground Coal Mine" (AQ / T 1047-2007) stipulates that when the coal seam gas pressure is less than 4MPa, the active pressure measurement needs to be observed for 5-10 days. engineering), the observation time of 5-10 days is still relatively long

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