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A thermo-hydromechanical displacement discontinuity method to model fractures in high-pressure, high-temperature environments

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  • Abdollahipour, Abolfazl
  • Fatehi Marji, Mohammad

Abstract

Geothermal reservoirs, oil wells, radioactive waste disposals, and deep underground mines deal with high-temperature and high-pressure problems. The thermo-hydromechanical coupling may significantly affect the behavior of the rock mass in these applications. Fractures and joints are the main conduits of thermal and hydraulic transition. The displacement discontinuity method (DDM) is ideally suited to model problems containing fractures. However, the DDM in its original formulation is restricted to elasticity problems. It is formulated in this study to take into account the thermo-hydromechanical effects. A numerical formulation and implementation for the thermo-hydromechanical DDM is derived. The proposed numerical model is validated in three parts. The poroelastic, thermoelastic, and thermo-hydromechanical couplings are each validated by analytical or experimental results. The results showed good agreement between the proposed numerical model and analytical or experimental results over various periods. The validations proved the accuracy and applicability of the proposed thermo-hydromechanical numerical model in a wide range of problems. Furthermore, the thermo-hydromechanical effect on crack opening displacement (COD) is modeled. Numerical simulation showed that the maximum COD due to only thermal effects may be reached after almost a year.

Suggested Citation

  • Abdollahipour, Abolfazl & Fatehi Marji, Mohammad, 2020. "A thermo-hydromechanical displacement discontinuity method to model fractures in high-pressure, high-temperature environments," Renewable Energy, Elsevier, vol. 153(C), pages 1488-1503.
    • Handle: RePEc:eee:renene:v:153:y:2020:i:c:p:1488-1503
    DOI: 10.1016/j.renene.2020.02.110
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    References listed on IDEAS

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    1. Li, Sanbai & Feng, Xia-Ting & Zhang, Dongxiao & Tang, Huiying, 2019. "Coupled thermo-hydro-mechanical analysis of stimulation and production for fractured geothermal reservoirs," Applied Energy, Elsevier, vol. 247(C), pages 40-59.
    2. Hofmann, Hannes & Babadagli, Tayfun & Zimmermann, Günter, 2014. "Hot water generation for oil sands processing from enhanced geothermal systems: Process simulation for different hydraulic fracturing scenarios," Applied Energy, Elsevier, vol. 113(C), pages 524-547.
    3. Wei, Xin & Feng, Zi-jun & Zhao, Yang-sheng, 2019. "Numerical simulation of thermo-hydro-mechanical coupling effect in mining fault-mode hot dry rock geothermal energy," Renewable Energy, Elsevier, vol. 139(C), pages 120-135.
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    1. Qiang Xie & Gao Li & Xu Yang & Hongli Peng, 2023. "Evaluating the Degree of Tectonic Fracture Development in the Fourth Member of the Leikoupo Formation in Pengzhou, Western Sichuan, China," Energies, MDPI, vol. 16(4), pages 1-16, February.

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