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Propagation Characteristics of Supercritical Carbon Dioxide Induced Fractures under True Tri-Axial Stresses

Author

Listed:
  • Yi Hu

    (State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China)

  • Feng Liu

    (Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China
    School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China)

  • Yuqiang Hu

    (Underground Gas Store Management Agency of Huabei Oilfield Company, Renqiu 062550, China)

  • Yong Kang

    (Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China
    School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China)

  • Hao Chen

    (Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China
    School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China)

  • Jiawei Liu

    (Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China
    School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China)

Abstract

Supercritical carbon dioxide (SC-CO 2 ) fracturing is a non-aqueous fracturing technology, which has attracted considerable attention on exploiting shale gas. In this study, shale specimens and artificial sandstone specimens were used to conduct SC-CO 2 fracturing and water fracturing experiments to investigate the characteristics of SC-CO 2 induced fractures. An acoustic emission (AE) monitoring device was employed to monitor the AE energy release rate during the experiment. The experiment results indicate that the breakdown pressure of SC-CO 2 fracturing is lower than that of water fracturing under the same conditions, and the AE energy release rate of SC-CO 2 fracturing is 1–2 orders of magnitude higher than that of water fracturing. In artificial sandstone, which is homogeneous, the main fracture mainly propagates along the directions perpendicular to the minimum principal stress, no matter if using SC-CO 2 or water as the fracturing fluid, but in shale with weak structural planes, the propagation direction of the fracture is controlled by the combined effect of a weak structural plane and in-situ stress.

Suggested Citation

  • Yi Hu & Feng Liu & Yuqiang Hu & Yong Kang & Hao Chen & Jiawei Liu, 2019. "Propagation Characteristics of Supercritical Carbon Dioxide Induced Fractures under True Tri-Axial Stresses," Energies, MDPI, vol. 12(22), pages 1-13, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:22:p:4229-:d:284012
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    References listed on IDEAS

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    1. Wang, Lei & Yao, Bowen & Xie, Haojun & Winterfeld, Philip H. & Kneafsey, Timothy J. & Yin, Xiaolong & Wu, Yu-Shu, 2017. "CO2 injection-induced fracturing in naturally fractured shale rocks," Energy, Elsevier, vol. 139(C), pages 1094-1110.
    2. Wang, Qiang & Chen, Xi & Jha, Awadhesh N. & Rogers, Howard, 2014. "Natural gas from shale formation – The evolution, evidences and challenges of shale gas revolution in United States," Renewable and Sustainable Energy Reviews, Elsevier, vol. 30(C), pages 1-28.
    3. Middleton, Richard S. & Carey, J. William & Currier, Robert P. & Hyman, Jeffrey D. & Kang, Qinjun & Karra, Satish & Jiménez-Martínez, Joaquín & Porter, Mark L. & Viswanathan, Hari S., 2015. "Shale gas and non-aqueous fracturing fluids: Opportunities and challenges for supercritical CO2," Applied Energy, Elsevier, vol. 147(C), pages 500-509.
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