The pore throat of gas-filled tight sandstone is very slim, and the pore throat volume of the reservoir is compressed with the decline of the pore pressure during the process of exploitation, which results in rapid permeability decrease in the gas-filled reservoir and serious reservoir damages. As the conventional capillary pressure test can't reflect the changes of rock pore structure in the reservoir with the raise of the effective stress during the exploitation, the paper introduced capillary pressure te...
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