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Experimental investigation of granite properties under different temperatures and pressures and numerical analysis of damage effect in enhanced geothermal system

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  • Guo, Liang-Liang
  • Zhang, Yong-Bo
  • Zhang, Yan-Jun
  • Yu, Zi-Wang
  • Zhang, Jia-Ning

Abstract

In this work, the variation in granite mechanical property with temperature (30 °C–150 °C) under different confining stresses (0.1–60 MPa) is experimentally investigated specifically for reservoir secondary damage of hot dry rock through a series of triaxial tests. On the basis of the test results, the damage equations of elastic modulus and Poisson’s ratio of granite are obtained in accordance with damage theory. These equations are programmed into the TOUGHREACT-FLAC3D software. A field scale simulation is conducted to analyze the effect of secondary damage on the final generated electricity. The results indicated that as temperature and confining pressure gradually increase, the expansion direction of fracture turns from vertical to oblique and decreases to a single fracture plane. The mechanical properties of rock are continuously weakened with the increase in temperature. The confining pressure exerts a positive influence on elastic modulus and Poisson’s ratio of granite. The rock property around the discharge section of injection well is damaged significantly and is fractured because of the high temperature difference. The reservoir secondary damage decreases the reservoir temperature gradually, thereby reducing the generated power.

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  • Guo, Liang-Liang & Zhang, Yong-Bo & Zhang, Yan-Jun & Yu, Zi-Wang & Zhang, Jia-Ning, 2018. "Experimental investigation of granite properties under different temperatures and pressures and numerical analysis of damage effect in enhanced geothermal system," Renewable Energy, Elsevier, vol. 126(C), pages 107-125.
    • Handle: RePEc:eee:renene:v:126:y:2018:i:c:p:107-125
    DOI: 10.1016/j.renene.2018.02.117
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    5. Huang, Yibin & Zhang, Yanjun & Yu, Ziwang & Ma, Yueqiang & Zhang, Chi, 2019. "Experimental investigation of seepage and heat transfer in rough fractures for enhanced geothermal systems," Renewable Energy, Elsevier, vol. 135(C), pages 846-855.
    6. Yu, Likui & Wu, Xiaotian & Wang, Yadan & Ma, Weiwu & Liu, Gang, 2020. "Stratified rock hydraulic fracturing for enhanced geothermal system and fracture geometry evaluation via effective length," Renewable Energy, Elsevier, vol. 152(C), pages 713-723.
    7. Yang, Fujian & Wang, Guiling & Hu, Dawei & Liu, Yanguang & Zhou, Hui & Tan, Xianfeng, 2021. "Calibrations of thermo-hydro-mechanical coupling parameters for heating and water-cooling treated granite," Renewable Energy, Elsevier, vol. 168(C), pages 544-558.
    8. Yan-Jun Shen & Xin Hou & Jiang-Qiang Yuan & Chun-Hu Zhao, 2019. "Experimental Study on Temperature Change and Crack Expansion of High Temperature Granite under Different Cooling Shock Treatments," Energies, MDPI, vol. 12(11), pages 1-17, May.
    9. Yangchun Wu & Linqi Huang & Xibing Li & Yide Guo & Huilin Liu & Jiajun Wang, 2022. "Effects of Strain Rate and Temperature on Physical Mechanical Properties and Energy Dissipation Features of Granite," Mathematics, MDPI, vol. 10(9), pages 1-20, May.

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