Hydraulic pressure and permeability will change in upper aquifer during flow injection in shale gas production.

Different induced hydraulic stresses create variable hydraulic pressures and permeabilities, which are quantified.

An Experimental device is developed to investigate the hydromechanical effect of the induced hydraulic stresses.

The coupled hydromechanical model produces better numerical results compared to the single hydraulic model.

A higher injection pressure is found to increase the permeability of the upper layer.