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Unconventional Gas: Experimental Study of the Influence of Subcritical Carbon Dioxide on the Mechanical Properties of Black Shale

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  • Qiao Lyu

    (School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
    Key Laboratory of Hubei Province for Water Jet Theory & New Technology, Wuhan 430072, China
    Deep Earth Energy Lab, Department of Civil Engineering, Monash University, Melbourne 3800, Australia)

  • Xinping Long

    (School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
    Key Laboratory of Hubei Province for Water Jet Theory & New Technology, Wuhan 430072, China)

  • Pathegama Gamage Ranjith

    (Deep Earth Energy Lab, Department of Civil Engineering, Monash University, Melbourne 3800, Australia)

  • Yong Kang

    (School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
    Key Laboratory of Hubei Province for Water Jet Theory & New Technology, Wuhan 430072, China)

Abstract

An experimental study was performed to investigate the effect of subcritical carbon dioxide (CO 2 ) adsorption on mechanical properties of shales with different coring directions. Uniaxial compressive strength (UCS) tests were conducted on shale samples with different CO 2 adsorption time at a pressure of 7 MPa and a temperature of 40 °C. The crack propagation and the failure mechanism of shale samples were recorded by using acoustic emission (AE) sensors together with ARAMIS technology. According to the results, samples with parallel and normal bedding angles present reductions of 26.7% and 3.0% in UCS, 30.7% and 36.7% in Young’s modulus after 10 days’ adsorption of CO 2 , and 30.3% and 18.4% in UCS, 13.8% and 22.6% in Young’s modulus after 20 days’ adsorption of CO 2 . Samples with a normal bedding angle presented higher brittleness index than that with a parallel bedding angle. The strain distributions show that longer CO 2 adsorption will cause higher axial strains and lateral strains. The AE results show that samples with a parallel angle have higher AE energy release than the samples with a normal angle. Finally, samples with longer CO 2 adsorption times present higher cumulative AE energy release.

Suggested Citation

  • Qiao Lyu & Xinping Long & Pathegama Gamage Ranjith & Yong Kang, 2016. "Unconventional Gas: Experimental Study of the Influence of Subcritical Carbon Dioxide on the Mechanical Properties of Black Shale," Energies, MDPI, vol. 9(7), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:7:p:516-:d:73441
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    References listed on IDEAS

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    1. Perera, M.S.A. & Ranjith, P.G. & Choi, S.K. & Airey, D., 2011. "The effects of sub-critical and super-critical carbon dioxide adsorption-induced coal matrix swelling on the permeability of naturally fractured black coal," Energy, Elsevier, vol. 36(11), pages 6442-6450.
    2. Perera, M.S.A. & Ranjith, P.G. & Viete, D.R., 2013. "Effects of gaseous and super-critical carbon dioxide saturation on the mechanical properties of bituminous coal from the Southern Sydney Basin," Applied Energy, Elsevier, vol. 110(C), pages 73-81.
    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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    Cited by:

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    2. Yin, Hong & Zhou, Junping & Xian, Xuefu & Jiang, Yongdong & Lu, Zhaohui & Tan, Jingqiang & Liu, Guojun, 2017. "Experimental study of the effects of sub- and super-critical CO2 saturation on the mechanical characteristics of organic-rich shales," Energy, Elsevier, vol. 132(C), pages 84-95.
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    5. Lyu, Qiao & Long, Xinping & Ranjith, P.G. & Tan, Jingqiang & Kang, Yong & Wang, Zhanghu, 2018. "Experimental investigation on the mechanical properties of a low-clay shale with different adsorption times in sub-/super-critical CO2," Energy, Elsevier, vol. 147(C), pages 1288-1298.
    6. Beining Zhang & Weiguo Liang & Pathegama Gamage Ranjith & Wei He & Zhigang Li & Xiaogang Zhang, 2018. "Effects of Coal Deformation on Different-Phase CO 2 Permeability in Sub-Bituminous Coal: An Experimental Investigation," Energies, MDPI, vol. 11(11), pages 1-25, October.
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