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Heat Extraction Evaluation of CO 2 and Water Flow through Different Fracture Networks for Enhanced Geothermal Systems

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  • Zhixue Sun

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Wentong Song

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Hao Zhang

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Xueyuan Li

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Shuang Xie

    (Northwest Oil Field Branch of Sinopec, Urumqi 830011, China)

  • Haifeng Nie

    (Tarim Oilfield Company, Alar 842209, China)

Abstract

Enhanced geothermal system (EGS) technologies have been developed to improve geothermal energy production from hot dry rock (HDR). In this study, discrete fracture network models for geometric topological networks that consider different parameters (the fracture density and the fracture length index) were built on the basis of fractal geometry theory. The heat extraction processes of CO 2 and water as the working fluid through different discrete fracture networks were simulated with the application of the thermal–hydraulic–mechanical (THM) coupled method. A series of sensitivity analyses were carried out to reveal the influences of fracture parameters on heat transfer processes. Based on the simulation results, heat extraction efficiencies and temperature distributions in the reservoir of CO 2 and water as the working fluid were compared, which showed that CO 2 as the working fluid can bring a faster thermal breakthrough. It was found that the fracture length index a = 2.5 and the fracture density I = 5.0 can provide the highest heat extraction rate compared with other cases. This study provides a detailed analysis of fracture parameters and working fluids, which will contribute to the optimized management of geothermal energy production.

Suggested Citation

  • Zhixue Sun & Wentong Song & Hao Zhang & Xueyuan Li & Shuang Xie & Haifeng Nie, 2023. "Heat Extraction Evaluation of CO 2 and Water Flow through Different Fracture Networks for Enhanced Geothermal Systems," Energies, MDPI, vol. 17(1), pages 1-13, December.
    • Handle: RePEc:gam:jeners:v:17:y:2023:i:1:p:86-:d:1305925
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    References listed on IDEAS

    as
    1. Xu, Chaoshui & Dowd, Peter Alan & Tian, Zhao Feng, 2015. "A simplified coupled hydro-thermal model for enhanced geothermal systems," Applied Energy, Elsevier, vol. 140(C), pages 135-145.
    2. 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.
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