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Mechanical Behavior and Permeability Evolution of Reconstituted Coal Samples under Various Unloading Confining Pressures—Implications for Wellbore Stability Analysis

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  • Qiangui Zhang

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
    College of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China)

  • Xiangyu Fan

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
    College of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China)

  • Yongchang Liang

    (College of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China)

  • Minghui Li

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China)

  • Guangzhi Li

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China)

  • Tianshou Ma

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
    College of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China)

  • Wen Nie

    (Quanzhou Institute of Equipment Manufacturing, Haixi Institutes, Chinese Academy of Sciences, Quanzhou 362200, China
    Landslide Research, Faculty of Civil Geo and Environmental Engineering, Technische Universität München, Munich 80333, Germany)

Abstract

Low pressure, low permeability, and low saturation of Chinese coal-bed methane (CBM) reservoirs make underbalanced drilling (UBD) widely used for mining CBM in China. In this study, mechanical behavior and permeability of coal rock were investigated under different degrees of unloading confining pressure (UCP)-reloading axial stress (RAS) by a triaxial experimental apparatus. These tests revealed that: (1) peak deviatoric stress of coal rock in UCP-RAS is lower than that in a conventional triaxial compression (CTC) test, and the peak deviatoric stress linearly relates the degree of unloading confining pressure. The deformation modulus of coal in UCP-RAS is lower than that in CTC, while the lateral expansion ratio is larger than that in CTC; (2) higher UCP leads to a faster increase of permeability during RAS until the failure of coal; (3) the cohesion and internal friction angle tested by UCP-RAS are lower by 4.57% and 15.18% than those tested by CTC. In addition, a field case (Zhaozhuang well, Qinshui Basin, China) of a well collapse problem validates the higher probability of wellbore collapse due to the increase of equivalent collapse fluid density, which is calculated by using coal rock parameters tested by UCP-RAS rather than by CTC.

Suggested Citation

  • Qiangui Zhang & Xiangyu Fan & Yongchang Liang & Minghui Li & Guangzhi Li & Tianshou Ma & Wen Nie, 2017. "Mechanical Behavior and Permeability Evolution of Reconstituted Coal Samples under Various Unloading Confining Pressures—Implications for Wellbore Stability Analysis," Energies, MDPI, vol. 10(3), pages 1-19, March.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:3:p:292-:d:91984
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    References listed on IDEAS

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    1. Jasinge, D. & Ranjith, P.G. & Choi, Xavier & Fernando, J., 2012. "Investigation of the influence of coal swelling on permeability characteristics using natural brown coal and reconstituted brown coal specimens," Energy, Elsevier, vol. 39(1), pages 303-309.
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    Cited by:

    1. Zetian Zhang & Ru Zhang & Zhiguo Cao & Mingzhong Gao & Yong Zhang & Jing Xie, 2020. "Mechanical Behavior and Permeability Evolution of Coal under Different Mining-Induced Stress Conditions and Gas Pressures," Energies, MDPI, vol. 13(11), pages 1-26, May.
    2. Niu, Qinghe & Cao, Liwen & Sang, Shuxun & Zhou, Xiaozhi & Wang, Zhenzhi & Wu, Zhiyong, 2017. "The adsorption-swelling and permeability characteristics of natural and reconstituted anthracite coals," Energy, Elsevier, vol. 141(C), pages 2206-2217.
    3. Yubing Liu & Enyuan Wang & Dong Zhao & Li Zhang, 2023. "Energy Evolution Characteristics of Water-Saturated and Dry Anisotropic Coal under True Triaxial Stresses," Sustainability, MDPI, vol. 15(2), pages 1-16, January.
    4. Heng Gao & Jun Lu & Zetian Zhang & Cong Li & Yihang Li, 2023. "Experimental Study on the Effect of Freeze-Thaw Cycles on the Mechanical and Permeability Characteristics of Coal," Sustainability, MDPI, vol. 15(16), pages 1-15, August.
    5. Xuyue Chen & Jin Yang & Deli Gao & Yongcun Feng & Yanjun Li & Ming Luo, 2018. "The Maximum-Allowable Well Depth While Drilling of Extended-Reach Wells Targeting to Offshore Depleted Reservoirs," Energies, MDPI, vol. 11(5), pages 1-17, April.

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