Thermal-Hydraulic-Mechanical (THM) Modelling of Short-Term Gas Storage in a Depleted Gas Reservoir—A Case Study from South Germany

This study addresses the use of former gas storage facilities as short-term for renewable energy through power-to-gas (PtG) technology in Germany. Three test cases with coupled thermal-hydromechanical (THM) modelling were conducted to evaluate injection and production schedules. The operating rates controlled by upper lower limits wellbore pressure. maximum difference pore pressure effective stress was 0.6 MPa all cases. Fault reactivation analysis performed on THM models estimate fault stability. critical safe reservoir operation determined be 1.25 times original pressure, corresponding a WBHP value 20.25 MPa. limit rate estimated between 100,000 150,000 m3/day. thermal stresses found negligible capacity PtG reported up 1,322,400 kWh/d electricity, which can contribute Germany becoming greenhouse neutral country 2050. workflows results are applicable porous medium, including methane, CO2, hydrogen.