Measuring method for coal seam gas permeability coefficient
A test method and gas permeability technology, applied in the field of coal seam gas permeability coefficient test, can solve the problems of difficult to accurately measure borehole gas flow, long test period, unable to find suitable calculation formula, etc., and achieve the effect of simple and easy test process.
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 The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
 see figure 1 , in this embodiment, two boreholes are constructed on the coal seam 3 at a certain distance d, one is the gas injection hole 1, and the other is the extraction detection hole 2, the gas injection hole 1 is connected to the air compressor 4 through the connecting hose 6, the two They are connected through the flange plate 7, and the pressure provided by the air compressor 4 is observed through the pressure gauge 5; the drainage detection hole 2 is connected to the gas drainage system pipeline 9 through a connecting hose, and the two are connected through a flange The gas drainage system pipeline is also connected through the flange plate, and the gas drainage system pipeline is under negative pressure, which can extract the gas in the drainage detection hole 2; the drainage detection hole 2 and Gas detection ports are provi...
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