On Stress Sensitivity for Permeability in Low-permeability Sandstones

Different evaluation results may be obtained based on different evaluation methodologies.In this study, permeability is measured on a low-permeability clayey sandstone with the variation of confine pressure and pore pressure,and nitrogen is as the pore fluid.Effective stress coefficient for permeability is gained with Bernabe's method.Furthermore,effective stress for permeability can be expressed.Stress sensitivity index is revised,and the sample shows moderate stress sensitivity.