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Influence of long-term operation of supercritical carbon dioxide based enhanced geothermal system on mineralogical and microstructurally-induced mechanical alteration of surrounding rock mass

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  • Isaka, B.L. Avanthi
  • Ranjith, P.G.
  • Rathnaweera, T.D.
  • Perera, M.S.A.
  • Kumari, W.G.P.

Abstract

Chemico-microstructural and mineralogically-induced time-dependent mechanical alterations of the reservoir rock found in the peripheral zone of a CO2-based EGS is experimentally investigated. A series of uniaxial compressive and triaxial (under 30 MPa constant confining pressure with different temperatures; 25-300 °C) strength tests on granite specimens reacted in ScCO2+water medium for different time periods was performed by coupling acoustic emission (AE) technique. The results were compared with those for intact and water-reacted rock specimens in order to better understand this weakening phenomenon. Scanning electron microscopy (SEM) was also incorporated to evaluate the microstructural and mineralogical alterations.

Suggested Citation

  • Isaka, B.L. Avanthi & Ranjith, P.G. & Rathnaweera, T.D. & Perera, M.S.A. & Kumari, W.G.P., 2019. "Influence of long-term operation of supercritical carbon dioxide based enhanced geothermal system on mineralogical and microstructurally-induced mechanical alteration of surrounding rock mass," Renewable Energy, Elsevier, vol. 136(C), pages 428-441.
    • Handle: RePEc:eee:renene:v:136:y:2019:i:c:p:428-441
    DOI: 10.1016/j.renene.2018.12.104
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    References listed on IDEAS

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    1. Perera, M.S.A. & Ranjith, P.G. & Viete, D.R., 2013. "Effects of gaseous and super-critical carbon dioxide saturation on the mechanical properties of bituminous coal from the Southern Sydney Basin," Applied Energy, Elsevier, vol. 110(C), pages 73-81.
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    5. Badulla Liyanage Avanthi Isaka & Ranjith Pathegama Gamage & Tharaka Dilanka Rathnaweera & Mandadige Samintha Anne Perera & Dornadula Chandrasekharam & Wanniarachchige Gnamani Pabasara Kumari, 2018. "An Influence of Thermally-Induced Micro-Cracking under Cooling Treatments: Mechanical Characteristics of Australian Granite," Energies, MDPI, vol. 11(6), pages 1-24, May.
    6. Xiaogang Zhang & Ranjith Pathegama Gamage & Mandadige Samintha Anne Perera & Ashani Savinda Ranathunga, 2018. "Effects of Water and Brine Saturation on Mechanical Property Alterations of Brown Coal," Energies, MDPI, vol. 11(5), pages 1-17, May.
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    Cited by:

    1. Wu, Yu & Li, Pan & Hao, Yang & Wanniarachchi, Ayal & Zhang, Yan & Peng, Shuhua, 2021. "Experimental research on carbon storage in a CO2-Based enhanced geothermal system," Renewable Energy, Elsevier, vol. 175(C), pages 68-79.
    2. Zhang, Yuliang & Zhao, Gao-Feng, 2023. "A multiphysics method for long-term deformation analysis of reservoir rock considering thermal damage in deep geothermal engineering," Renewable Energy, Elsevier, vol. 204(C), pages 432-448.
    3. Song, Weiqiang & Wang, Chunguang & Du, Yukun & Shen, Baotang & Chen, Shaojie & Jiang, Yujing, 2020. "Comparative analysis on the heat transfer efficiency of supercritical CO2 and H2O in the production well of enhanced geothermal system," Energy, Elsevier, vol. 205(C).
    4. An, Qiyi & Zhang, Qingsong & Li, Xianghui & Yu, Hao & Zhang, Xiao, 2022. "Experimental study on alteration kinetics for predicting rock mechanics damage caused by SC-CO2," Energy, Elsevier, vol. 259(C).
    5. An, Qiyi & Zhang, Qingsong & Li, Xianghui & Yu, Hao & Yin, Zhanchao & Zhang, Xiao, 2022. "Accounting for dynamic alteration effect of SC-CO2 to assess role of pore structure on rock strength: A comparative study," Energy, Elsevier, vol. 260(C).

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