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The stress dependent permeability of a mudstone sample was measured using a transient pulse technique in a specially designed apparatus in which the confining pressure, pore pressure, and temperature were independently controlled. Experiments were conducted with the confining pressure first gradually increased from 10 to 30MPa and then subsequently reduced back to 10MPa. And the pore pressure was kept constant of 5MPa during the whole process. During the loading process of effective confining pressure, the permeability of the mudstone had a nonlinear reduction with increasing stress and showed a high stress sensitivity (varying three orders of magnitude). The phenomenon can be explained that microcrack closure is the dominant mechanism controlling the evolution of mudstone permeability with the effective confining pressure during the loading process. The experimental results indicate that there is good fit of a model with exponential relationship of permeability and effective confining pressure to the data points. When unloading the effective confining pressure, the permeability of mudstone had very tiny increase and showed weak recovery capability. This is the result of the irreversibility of crack closure

Experimental Study of the Laws Between the Effective Confining Pressure and Mudstone Permeability