Simultaneous determination of the effective stress coefficients for permeability and volumetric strain on a tight sandstone

Gas transport processes in low-permeable (tight) sandstones at elevated pore pressures involve a combination of fluid-dynamic (slip flow) and poro-elastic or rock-mechanical stress (pore and bulk compressibility) effects. To assess the interdependency of both processes, permeability experiments with gas (argon) were combined with volumetric strain measurements. The flow studies were performed under controlled effective stress (10, 20 and 30 MPa)...