Method for measuring gas permeation coefficient of compact rock under three dimensional stress condition
A technology of three-dimensional stress and gas permeation, which is applied in the directions of measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problems of complex on-site sample operation, long test period, and huge cost, and achieve test results. The effect of short process, overcoming large measurement error, and simple and convenient test operation
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Embodiment 1
[0042] 1) This example is to measure the permeability coefficient of tight sandstone under the action of each stress path. First, a test rock sample with a diameter of 50 mm and a height of 100 mm is made according to the standard, and the rock sample is dried in an oven for 24 hours and then loaded into a triaxial pressure chamber;
[0043] 2) Apply the confining pressure to the predetermined value of 20MPa, and keep the confining pressure unchanged;
[0044] 3) After the confining pressure is stable, apply a bias voltage to 60MPa and keep the bias voltage unchanged;
[0045] 4) After the bias voltage is stabilized, close the gas outlet switch and increase the gas pressure at the gas inlet to 10MPa. Due to the pressure difference, the gas gradually flows through the rock sample to the gas discharge system, and the pressure at both ends of the sample is gradually balanced to 5MPa;
[0046] 5) When the pressure value of the air inlet and the air outlet are equal, the pressure o...
Embodiment 2
[0050] 1) This example is to measure the permeability coefficient of granite gneiss under each stress path. Firstly, a test rock sample with a diameter of 50 mm and a height of 100 mm is made according to the standard. The rock sample is dried in an oven for 24 hours and then loaded into a triaxial pressure chamber. middle;
[0051] 2) Apply the confining pressure to the predetermined value of 20MPa, and keep the confining pressure unchanged;
[0052] 3) After the confining pressure is stable, apply a bias voltage to 60MPa and keep the bias voltage unchanged;
[0053] 4) After the bias voltage is stabilized, close the gas outlet switch and increase the gas pressure at the gas inlet to 10MPa. Due to the pressure difference, the gas gradually flows through the rock sample to the gas discharge system, and the pressure at both ends of the sample is gradually balanced to 5MPa;
[0054] 5) When the pressure value of the air inlet and the air outlet are equal, the pressure of the ai...
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