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Numerical simulation of multifracture HDR geothermal reservoirs

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  • Aliyu, Musa D.
  • Archer, Rosalind A.

Abstract

This paper presents a three-dimensional (3D) numerical model of multifracture hot dry rock (HDR) systems using coupled thermo-hydro-mechanical (THM) modelling processes. Several numerical models are implemented in the COMSOL Multiphysics Finite Element (FE) solver to analyse the effect of fracture spacing and number on reservoir productivity. The developed multifracture HDR reservoirs employ vertical fracture systems with deviated wellbores to reflect the state of stress in deep geological formations. The models consider the geomechanical effect of fracture aperture, permeability and stiffness changes on each individual fracture during long-term exploitation of 30 years. The crucial parameters investigated concerning reservoir productivity are production temperature, thermal energy and recovery rate. The results show that both fracture number and spacing affect the productivity of HDR geothermal systems. It is clear from the results that variations of geomechanical parameters of fracture aperture, permeability and stiffness can play a crucial role in enhancing the performance of these systems.

Suggested Citation

  • Aliyu, Musa D. & Archer, Rosalind A., 2021. "Numerical simulation of multifracture HDR geothermal reservoirs," Renewable Energy, Elsevier, vol. 164(C), pages 541-555.
    • Handle: RePEc:eee:renene:v:164:y:2021:i:c:p:541-555
    DOI: 10.1016/j.renene.2020.09.085
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    References listed on IDEAS

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    5. Ning Li & Heping Xie & Ziqi Gao & Cunbao Li, 2022. "Study on the Hydraulic Fracturing Failure Behaviour of Granite and Its Comparison with Gas Fracturing," Sustainability, MDPI, vol. 14(21), pages 1-19, November.
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    7. Cao, Meng & Sharma, Mukul M., 2023. "Effect of fracture geometry, topology and connectivity on energy recovery from enhanced geothermal systems," Energy, Elsevier, vol. 282(C).
    8. Qiao, Mingzheng & Jing, Zefeng & Feng, Chenchen & Li, Minghui & Chen, Cheng & Zou, Xupeng & Zhou, Yujuan, 2024. "Review on heat extraction systems of hot dry rock: Classifications, benefits, limitations, research status and future prospects," Renewable and Sustainable Energy Reviews, Elsevier, vol. 196(C).
    9. Gudala, Manojkumar & Yan, Bicheng & Tariq, Zeeshan & Zhang, Fengshou & Sun, Shuyu, 2024. "Doublet huff and puff: A new technology for efficient geological CO2 sequestration and stable geothermal recovery," Applied Energy, Elsevier, vol. 367(C).
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    11. Zhao, Peng & Liu, Jun & Elsworth, Derek, 2023. "Numerical study on a multifracture enhanced geothermal system considering matrix permeability enhancement induced by thermal unloading," Renewable Energy, Elsevier, vol. 203(C), pages 33-44.
    12. Xue, Yi & Liu, Shuai & Chai, Junrui & Liu, Jia & Ranjith, P.G. & Cai, Chengzheng & Gao, Feng & Bai, Xue, 2023. "Effect of water-cooling shock on fracture initiation and morphology of high-temperature granite: Application of hydraulic fracturing to enhanced geothermal systems," Applied Energy, Elsevier, vol. 337(C).
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    14. Yu, Ziwang & Ye, Xiaoqi & Zhang, Yanjun & Gao, Ping & Huang, Yibin, 2023. "Experimental research on the thermal conductivity of unsaturated rocks in geothermal engineering," Energy, Elsevier, vol. 282(C).

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