Measuring device for gas permeability of coal rock core
A technology for gas permeability and measuring device, which is applied in measuring device, permeability/surface area analysis, DC flow characteristic measurement, etc. There is no uniform method and standard for effective liquid permeability, so as to achieve the effect of low cost, small experimental error and improved measurement accuracy.
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[0017] The embodiment of the present invention will be described in detail below in conjunction with specific experimental steps. The experimental steps are as follows:
[0018] (1) Measure the diameter and length of the coal rock core with a vernier card;
[0019] (2) Check the airtightness of the device;
[0020] (3) Turn off the high-pressure gas cylinder and precision pressure gauge 6, and vacuumize with a vacuum pump;
[0021] (4) Put the coal rock core into the coal rock holder, apply confining pressure to the core with a hand pump, and the confining pressure should be 0.5 MPa higher than the upstream pressure;
[0022] (5) Open the high-pressure gas cylinder, let the gas enter the core holder after passing through the pressure reducing valve and the buffer container, and the inlet pressure is between 0 and 5 MPa. After the gas flow is stable, record the time it takes for the soap film to pass a certain scale;
[0023] (6) Record the upstream pressure value of precis...
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