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

Author

Listed:
  • Muhammad Zain-Ul-Abedin

    (Institute of Applied Geosciences, Technical University of Darmstadt, 64287 Darmstadt, Germany)

  • Andreas Henk

    (Institute of Applied Geosciences, Technical University of Darmstadt, 64287 Darmstadt, Germany)

Abstract

This study addresses the use of former gas storage facilities as short-term storage for renewable energy through power-to-gas (PtG) technology in Germany. Three test cases with coupled thermal-hydromechanical (THM) modelling were conducted to evaluate short-term injection and production schedules. The operating rates were controlled by the upper and lower limits of the wellbore pressure. The maximum difference in pore pressure and effective stress was 0.6 MPa in all cases. Fault reactivation analysis was performed on the THM models to estimate fault stability. The critical pore pressure for safe reservoir operation was determined to be 1.25 times the original pore pressure, corresponding to a WBHP value of 20.25 MPa. The upper limit of the gas injection rate for safe storage operation was estimated to be between 100,000 and 150,000 m 3 /day. The thermal stresses were found to be negligible for short-term cases. The storage capacity of PtG technology was reported to be up to 1,322,400 kWh/d of renewable electricity, which can contribute to Germany becoming a greenhouse gas neutral country by 2050. The workflows and results of the study are applicable to all gas storage in a porous medium, including methane, CO 2 , and hydrogen.

Suggested Citation

  • Muhammad Zain-Ul-Abedin & Andreas Henk, 2023. "Thermal-Hydraulic-Mechanical (THM) Modelling of Short-Term Gas Storage in a Depleted Gas Reservoir—A Case Study from South Germany," Energies, MDPI, vol. 16(8), pages 1-29, April.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:8:p:3389-:d:1121743
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    References listed on IDEAS

    as
    1. Jie Zhang & Feifei Fang & Wei Lin & Shusheng Gao & Yalong Li & Qi Li & Yi Yang, 2020. "Research on Injection-Production Capability and Seepage Characteristics of Multi-Cycle Operation of Underground Gas Storage in Gas Field—Case Study of the Wen 23 Gas Storage," Energies, MDPI, vol. 13(15), pages 1-17, July.
    2. Xiaolin Huan & Gao Xu & Yi Zhang & Feng Sun & Shifeng Xue, 2021. "Study on Thermo-Hydro-Mechanical Coupling and the Stability of a Geothermal Wellbore Structure," Energies, MDPI, vol. 14(3), pages 1-15, January.
    3. Muhammad Zain-Ul-Abedin & Andreas Henk, 2020. "Building 1D and 3D Mechanical Earth Models for Underground Gas Storage—A Case Study from the Molasse Basin, Southern Germany," Energies, MDPI, vol. 13(21), pages 1-21, November.
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