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Numerical Simulation of Thermo-Hydro-Mechanical Processes at Soultz-sous-Forêts

Author

Listed:
  • Saeed Mahmoodpour

    (Group of Geothermal Technologies, Technical University Munich, 80333 Munich, Germany)

  • Mrityunjay Singh

    (Group of Geothermal Science and Technology, Institute of Applied Geosciences, Technische Universität Darmstadt, Schnittspahnstrasse 9, 64287 Darmstadt, Germany)

  • Ramin Mahyapour

    (Department of Chemical Engineering, Sharif University of Technology, Tehran 11365-11155, Iran)

  • Sri Kalyan Tangirala

    (Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India)

  • Kristian Bär

    (GeoThermal Engineering GmbH, 76227 Karlsruhe, Germany)

  • Ingo Sass

    (Group of Geothermal Science and Technology, Institute of Applied Geosciences, Technische Universität Darmstadt, Schnittspahnstrasse 9, 64287 Darmstadt, Germany
    Geoenergy Section, GFZ, 14473 Potsdam, Germany)

Abstract

Porosity and permeability alteration due to the thermo-poro-elastic stress field disturbance from the cold fluid injection is a deciding factor for longer, more economic, and safer heat extraction from an enhanced geothermal system (EGS). In the Soultz-sous-Forêts geothermal system, faulted zones are the main flow paths, and the resulting porosity–permeability development over time due to stress reorientation is more sensitive in comparison with the regions without faulted zones. Available operational and field data are combined through a validated numerical simulation model to examine the mechanical impact on the pressure and temperature evolution. Results shows that near the injection wellbore zones, permeability and porosity values are strongly affected by stress field changes, and that permeability changes will affect the overall temperature and pressure of the system, demonstrating a fully coupled phenomenon. In some regions inside the faulted zones and close to injection wellbores, porosity doubles, whereas permeability may be enhanced up to 30 times. A sensitivity analysis is performed using two parameters which are not well discussed in the literature the for mechanical aspect, but the results in this study show that one of them impacts significantly on the porosity–permeability changes. Further experimental and field works on this parameter will help to model the heat extraction more precisely than before.

Suggested Citation

  • Saeed Mahmoodpour & Mrityunjay Singh & Ramin Mahyapour & Sri Kalyan Tangirala & Kristian Bär & Ingo Sass, 2022. "Numerical Simulation of Thermo-Hydro-Mechanical Processes at Soultz-sous-Forêts," Energies, MDPI, vol. 15(24), pages 1-21, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:24:p:9285-:d:996444
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    References listed on IDEAS

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    1. Salimzadeh, Saeed & Nick, Hamidreza M. & Zimmerman, R.W., 2018. "Thermoporoelastic effects during heat extraction from low-permeability reservoirs," Energy, Elsevier, vol. 142(C), pages 546-558.
    2. Mahmoodpour, Saeed & Singh, Mrityunjay & Bär, Kristian & Sass, Ingo, 2022. "Thermo-hydro-mechanical modeling of an enhanced geothermal system in a fractured reservoir using carbon dioxide as heat transmission fluid- A sensitivity investigation," Energy, Elsevier, vol. 254(PB).
    3. Zhao, Yangsheng & Feng, Zijun & Feng, Zengchao & Yang, Dong & Liang, Weiguo, 2015. "THM (Thermo-hydro-mechanical) coupled mathematical model of fractured media and numerical simulation of a 3D enhanced geothermal system at 573 K and buried depth 6000–7000 M," Energy, Elsevier, vol. 82(C), pages 193-205.
    4. Kang, Fangchao & Li, Yingchun & Tang, Chun'an & Huang, Xin & Li, Tianjiao, 2022. "Competition between cooling contraction and fluid overpressure on aperture evolution in a geothermal system," Renewable Energy, Elsevier, vol. 186(C), pages 704-716.
    5. Mahmoodpour, Saeed & Singh, Mrityunjay & Turan, Aysegul & Bär, Kristian & Sass, Ingo, 2022. "Simulations and global sensitivity analysis of the thermo-hydraulic-mechanical processes in a fractured geothermal reservoir," Energy, Elsevier, vol. 247(C).
    6. Slatlem Vik, Hedda & Salimzadeh, Saeed & Nick, Hamidreza M., 2018. "Heat recovery from multiple-fracture enhanced geothermal systems: The effect of thermoelastic fracture interactions," Renewable Energy, Elsevier, vol. 121(C), pages 606-622.
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    Cited by:

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