Abstract
The results of an experimental investigation of the transition from ordinary to critical flow conditions in samples of sandstones, limestones and aleurolites are presented. The porosity of the samples varied on the interval from 0.08 to 0.24, and the permeability coefficient on the interval from 2·10−3 to 0.47 µm2. It is shown that the critical regimes are realized at a ratio of the pressure ahead of the sample to the pressure at its outlet on the interval 2.3–9. The pressure at the sample outlet was considerably higher than atmospheric, and the average gas velocities in the pores at the sample outlet were much lower than the speed of sound and did not exceed a few meters per second. The effect of the various parameters on the critical gas flow rate is analyzed.
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