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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. Yuan Zhao & Lingfeng Shu & Shunyi Chen & Jun Zhao & Liangliang Guo, 2022. "Optimization Design of Multi-Factor Combination for Power Generation from an Enhanced Geothermal System by Sensitivity Analysis and Orthogonal Test at Qiabuqia Geothermal Area," Sustainability, MDPI, vol. 14(12), pages 1-35, June.
    6. 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.
    7. Lei, Zhihong & Zhang, Yanjun & Yu, Ziwang & Hu, Zhongjun & Li, Liangzhen & Zhang, Senqi & Fu, Lei & Zhou, Ling & Xie, Yangyang, 2019. "Exploratory research into the enhanced geothermal system power generation project: The Qiabuqia geothermal field, Northwest China," Renewable Energy, Elsevier, vol. 139(C), pages 52-70.
    8. Guo, Liang-Liang & Zhang, Yong-Bo & Wang, Zhi-Chao & Zeng, Jian & Zhang, Yan-Jun & Zhang, Zhi-Xiang, 2020. "Parameter sensitivity analysis and optimization strategy research of enhanced geothermal system: A case study in Guide Basin, Northwestern China," Renewable Energy, Elsevier, vol. 153(C), pages 813-831.
    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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