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Thermoporoelastic effects during heat extraction from low-permeability reservoirs

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  • Salimzadeh, Saeed
  • Nick, Hamidreza M.
  • Zimmerman, R.W.

Abstract

Thermoporoelastic effects during heat extraction from low permeability geothermal reservoirs are investigated numerically, based on the model of a horizontal penny-shaped fracture intersected by an injection well and a production well. A coupled formulation for thermo-hydraulic (TH) processes is presented that implicitly accounts for the mechanical deformation of the poroelastic matrix. The TH model is coupled to a separate mechanical contact model (M) that solves for the fracture contact stresses due to thermoporoelastic compression. Fractures are modelled as surface discontinuities within a three-dimensional matrix. A robust contact model is utilised to resolve the contact tractions between opposing fracture surfaces. Results show that due to the very low thermal diffusivity of the rock matrix, the thermally-induced pore pressure partially dissipates even in the very low-permeability rocks that are found in EGS projects. Therefore, using the undrained thermal expansion coefficient for the matrix may overestimate the volumetric strain of the rock in low-permeability enhanced geothermal systems, whereas using a drained thermal expansion coefficient for the matrix may underestimate the volumetric strain of the rock. An “effective” thermal expansion coefficient can be computed from the drained and undrained values to improve the prediction for the partially-drained matrix.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:142:y:2018:i:c:p:546-558
    DOI: 10.1016/j.energy.2017.10.059
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    References listed on IDEAS

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    1. 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.
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    Cited by:

    1. Xin-Yue Duan & Di Huang & Wen-Xian Lei & Shi-Chao Chen & Zhao-Qin Huang & Chuan-Yong Zhu, 2023. "Investigation of Heat Extraction in an Enhanced Geothermal System Embedded with Fracture Networks Using the Thermal–Hydraulic–Mechanical Coupling Model," Energies, MDPI, vol. 16(9), pages 1-19, April.
    2. 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.
    3. Salimzadeh, S. & Grandahl, M. & Medetbekova, M. & Nick, H.M., 2019. "A novel radial jet drilling stimulation technique for enhancing heat recovery from fractured geothermal reservoirs," Renewable Energy, Elsevier, vol. 139(C), pages 395-409.
    4. 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).
    5. Guo, Tiankui & Zhang, Yuelong & He, Jiayuan & Gong, Facheng & Chen, Ming & Liu, Xiaoqiang, 2021. "Research on geothermal development model of abandoned high temperature oil reservoir in North China oilfield," Renewable Energy, Elsevier, vol. 177(C), pages 1-12.
    6. Gong, Facheng & Guo, Tiankui & Sun, Wei & Li, Zhaomin & Yang, Bin & Chen, Yimei & Qu, Zhanqing, 2020. "Evaluation of geothermal energy extraction in Enhanced Geothermal System (EGS) with multiple fracturing horizontal wells (MFHW)," Renewable Energy, Elsevier, vol. 151(C), pages 1339-1351.
    7. Zhang, Yuliang & Zhao, Gao-Feng, 2023. "A multiphysics method for long-term deformation analysis of reservoir rock considering thermal damage in deep geothermal engineering," Renewable Energy, Elsevier, vol. 204(C), pages 432-448.
    8. Willems, C.J.L. & M. Nick, H., 2019. "Towards optimisation of geothermal heat recovery: An example from the West Netherlands Basin," Applied Energy, Elsevier, vol. 247(C), pages 582-593.
    9. Dong Zhu & Yuqing Fan & Xiaofei Liu & Xiangling Tao & Liegang Miao & Huiwu Jin, 2022. "Characteristics of Acoustic Emission Response during Granite Splitting after High Temperature-Water Cooling Cycles," Sustainability, MDPI, vol. 14(20), pages 1-16, October.
    10. Ziabakhsh-Ganji, Zaman & Nick, Hamidreza M. & Donselaar, Marinus E. & Bruhn, David F., 2018. "Synergy potential for oil and geothermal energy exploitation," Applied Energy, Elsevier, vol. 212(C), pages 1433-1447.
    11. 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.
    12. Babaei, Masoud & Nick, Hamidreza M., 2019. "Performance of low-enthalpy geothermal systems: Interplay of spatially correlated heterogeneity and well-doublet spacings," Applied Energy, Elsevier, vol. 253(C), pages 1-1.
    13. Ding, Junfeng & Wang, Shimin, 2018. "2D modeling of well array operating enhanced geothermal system," Energy, Elsevier, vol. 162(C), pages 918-932.
    14. 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.

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