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Combined Effects of CO 2 Adsorption-Induced Swelling and Dehydration-Induced Shrinkage on Caprock Sealing Efficiency

Author

Listed:
  • Xiaoji Shang

    (State Key Laboratory for Geomechanics & Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Jianguo Wang

    (State Key Laboratory for Geomechanics & Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Huimin Wang

    (College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China)

  • Xiaolin Wang

    (School of Engineering, University of Tasmania, Hobart 7001, Australia)

Abstract

Carbon dioxide (CO 2 ) may infiltrate into the caprock and displace brine water in the caprock layer. This causes two effects: one is the caprock swelling induced by the CO 2 adsorption and the other is the caprock dehydration and shrinkage due to CO 2 –brine water two-phase flow. The competition of these two effects challenges the caprock sealing efficiency. To study the evolution mechanism of the caprock properties, a numerical model is first proposed to investigate the combined effects of CO 2 adsorption-induced expansion and dehydration-induced shrinkage on the caprock sealing efficiency. In this model, the caprock matrix is fully saturated by brine water in its initial state and the fracture network has only a brine water–CO 2 two-phase flow. With the diffusion of CO 2 from the fractures into the caprock matrix, the CO 2 sorption and matrix dehydration can alter the permeability of the caprock and affect the entry capillary pressure. Second, this numerical model is validated with a breakthrough test. The effects of the two-phase flow on the water saturation, CO 2 adsorption on the swelling strain, and dehydration on the shrinkage strain are studied, respectively. Third, the permeability evolution mechanism in the CO 2 –brine water mixed zone is investigated. The effect of dehydration on the penetration depth is also analyzed. It is found that both the shale matrix dehydration and CO 2 sorption-induced swelling can significantly alter the sealing efficiency of the fractured caprock.

Suggested Citation

  • Xiaoji Shang & Jianguo Wang & Huimin Wang & Xiaolin Wang, 2022. "Combined Effects of CO 2 Adsorption-Induced Swelling and Dehydration-Induced Shrinkage on Caprock Sealing Efficiency," IJERPH, MDPI, vol. 19(21), pages 1-22, November.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:21:p:14574-:d:964989
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    References listed on IDEAS

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    1. Paul E. Hardisty & Mayuran Sivapalan & Peter Brooks, 2011. "The Environmental and Economic Sustainability of Carbon Capture and Storage," IJERPH, MDPI, vol. 8(5), pages 1-18, May.
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    3. Ahmed Fatah & Ziad Bennour & Hisham Ben Mahmud & Raoof Gholami & Md. Mofazzal Hossain, 2020. "A Review on the Influence of CO 2 /Shale Interaction on Shale Properties: Implications of CCS in Shales," Energies, MDPI, vol. 13(12), pages 1-27, June.
    4. Hou, Lianhua & Yu, Zhichao & Luo, Xia & Wu, Songtao, 2022. "Self-sealing of caprocks during CO2 geological sequestration," Energy, Elsevier, vol. 252(C).
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