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The Establishment and Evaluation Method of Artificial Microcracks in Rocks

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  • Zhenkai Wu

    (College of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
    Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China)

  • Xizhe Li

    (College of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
    Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China
    Research Institute of Petroleum Exploration & Development, Beijing 100083, China)

  • Hanmin Xiao

    (College of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
    Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China
    Research Institute of Petroleum Exploration & Development, Beijing 100083, China)

  • Xuewei Liu

    (Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China
    Research Institute of Petroleum Exploration & Development, Beijing 100083, China)

  • Wei Lin

    (School of Geosciences, Yangtze University, Wuhan 430100, China)

  • Yuan Rao

    (College of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
    Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China)

  • Yang Li

    (Research Institute of Petroleum Exploration & Development, Beijing 100083, China)

  • Jie Zhang

    (College of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
    Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China)

Abstract

It is necessary to carry out experiments on cores with different degrees of crack development when studying the seepage law of cracked reservoirs and evaluating cracks. The seepage experiment in the laboratory requires cores with different degrees of microcrack development; cores obtained via conventional drilling cannot meet the requirements, and the efficacies and evaluation methods of geological parameters used for artificial cracks are not perfect. In this study, cores are loaded using a triaxial gripper, and cracks are produced by changing the difference of stress; the relationship between the increased rate of permeability and the change in stress concentration is used to evaluate the degree of development of the crack in real time. The angle between the cracks and the maximum principal stress direction, calculated using the Mohr–Coulomb failure criterion, is 20–27.5°, which provides theoretical support for the process of crack creation. The experimental results show that the permeability variation curve shows two obvious turning points, which divide the whole zone into a reduction zone, a slow increase zone, and a rapid increase zone. Through the obtained experimental and evaluation results, a complete system for crack creation and evaluation is established, which can provide strong support for the study of cracked reservoirs.

Suggested Citation

  • Zhenkai Wu & Xizhe Li & Hanmin Xiao & Xuewei Liu & Wei Lin & Yuan Rao & Yang Li & Jie Zhang, 2021. "The Establishment and Evaluation Method of Artificial Microcracks in Rocks," Energies, MDPI, vol. 14(10), pages 1-12, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:10:p:2780-:d:553089
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    References listed on IDEAS

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    1. Chaohui Lyu & Qing Wang & Zhengfu Ning & Mingqiang Chen & Mingqi Li & Zhili Chen & Yuxuan Xia, 2018. "Investigation on the Application of NMR to Spontaneous Imbibition Recovery of Tight Sandstones: An Experimental Study," Energies, MDPI, vol. 11(9), pages 1-12, September.
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