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Assessing the applicability of unsaturated effective stress models to tensile fracturing of sandstone in CO 2 ‐water two‐phase fluids

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  • Mingze Liu
  • Bing Bai
  • Xiaochun Li
  • Shuai Gao
  • Shaobin Hu
  • Lei Wang
  • Haiqing Wu

Abstract

The description of rock effective stress in CO 2 ‐water two‐phase fluid (CWTPF) is a key issue in the mechanical stability analysis of CO 2 geological sequestration. Related simulation studies often directly used the unsaturated effective stress models without verifying their applicability. In this study, we present a self‐developed hollow‐cylinder tensile tester and a corresponding experimental method to measure the fracturing pressure of sandstone in CWTPF. Based on the apparatus, we conducted tensile fracturing experiments of sandstone in CWTPF. We also carried out fracturing tests of sandstone saturated with water under different effective confining pressure to fit the function of the sandstone's fracturing pressure and effective confining pressure. Then, we selected seven typical unsaturated effective stress models and Finally, we compared the results from the prediction models and experiments to indirectly verify the applicability of these unsaturated effective stress models under CWTPF conditions. The results indicated that the model proposed by Bishop and Donald in 1961 could best describe the effective stress of the tested sandstone in tension fracturing behavior under CWTPF condition. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd

Suggested Citation

  • Mingze Liu & Bing Bai & Xiaochun Li & Shuai Gao & Shaobin Hu & Lei Wang & Haiqing Wu, 2016. "Assessing the applicability of unsaturated effective stress models to tensile fracturing of sandstone in CO 2 ‐water two‐phase fluids," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 6(5), pages 670-681, October.
    • Handle: RePEc:wly:greenh:v:6:y:2016:i:5:p:670-681
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    File URL: http://hdl.handle.net/10.1002/ghg.1596
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    1. Qi Li & Wenbin Fei & Xuehao Liu & Xiaochen Wei & Miao Jing & Xiaochun Li, 2014. "Challenging combination of CO 2 geological storage and coal mining in the Ordos basin, China," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 4(4), pages 452-467, August.
    2. Streit, Jürgen E & Hillis, Richard R, 2004. "Estimating fault stability and sustainable fluid pressures for underground storage of CO2 in porous rock," Energy, Elsevier, vol. 29(9), pages 1445-1456.
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