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Changes in thermomechanical properties due to air and water cooling of hot dry granite rocks under unconfined compression

Author

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  • Zhu, Zhennan
  • Kempka, Thomas
  • Ranjith, Pathegama Gamage
  • Tian, Hong
  • Jiang, Guosheng
  • Dou, Bin
  • Mei, Gang

Abstract

Water has been used as a working fluid injected into the hot reservoirs during the exploitation of deep geothermal energy, therefore, understanding the thermomechanical properties of reservoir rocks after water cooling is essential. For that reason, we have conducted a series of laboratory tests on air and water cooled granites from normal temperature to 600 °C, to reveal the changes in their thermomechanical properties. At 600 °C, the average values of uniaxial compressive strength, elastic modulus and P-wave velocity of water cooled granite decrease by 84.9%, 73.1% and 66.2%, which are 11.0%, 17.0% and 17.7% larger than those of air cooled granite. Through optical microscopic analysis, the microcrack density and average width of water cooled granite increase with thermal temperature and are 4.18 mm/mm2 and 54.62 μm at 600 °C, while the values of air cooled granite are only 1.97 mm/mm2 and 25.16 μm. We thus combined the deterioration of the macroscopic mechanical characteristics of air and water cooled granites with the propagation and development of microcracks. Supported by data from international literature, the changes in the thermomechanical characteristics of granite has been systematically compared to international literature, which is hoped to provide technical support for the geothermal energy exploitation.

Suggested Citation

  • Zhu, Zhennan & Kempka, Thomas & Ranjith, Pathegama Gamage & Tian, Hong & Jiang, Guosheng & Dou, Bin & Mei, Gang, 2021. "Changes in thermomechanical properties due to air and water cooling of hot dry granite rocks under unconfined compression," Renewable Energy, Elsevier, vol. 170(C), pages 562-573.
    • Handle: RePEc:eee:renene:v:170:y:2021:i:c:p:562-573
    DOI: 10.1016/j.renene.2021.02.019
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    Citations

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    Cited by:

    1. Qu, Hai & Li, Chengying & Chen, Xiangjun & Liu, Xu & Guo, Ruichang & Liu, Ying, 2023. "LN cooling on mechanical properties and fracture characteristics of hot dry granites involving ANN prediction," Renewable Energy, Elsevier, vol. 216(C).
    2. Qiang Li & Tubing Yin & Xibing Li & Ronghua Shu, 2021. "Experimental and Numerical Investigation on Thermal Damage of Granite Subjected to Heating and Cooling," Mathematics, MDPI, vol. 9(23), pages 1-15, November.
    3. Haitham M. Ahmed & Hussin A. M. Ahmed & Sefiu O. Adewuyi, 2021. "Characterization of Microschist Rocks under High Temperature at Najran Area of Saudi Arabia," Energies, MDPI, vol. 14(22), pages 1-20, November.
    4. Xu, Fuqiang & Shi, Yu & Song, Xianzhi & Wu, Wei & Song, Guofeng & Li, Shuang, 2024. "Experimental characterization of damage during geothermal production of hot dry rocks: Comprehensive effects of the damage-elastic deformation on conductivity evolution," Energy, Elsevier, vol. 294(C).
    5. 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).
    6. Mohamed Elgharib Gomah & Guichen Li & Changlun Sun & Jiahui Xu & Sen Yang & Jinghua Li, 2022. "On the Physical and Mechanical Responses of Egyptian Granodiorite after High-Temperature Treatments," Sustainability, MDPI, vol. 14(8), pages 1-22, April.

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