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Effects of Coal Deformation on Different-Phase CO 2 Permeability in Sub-Bituminous Coal: An Experimental Investigation

Author

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  • Beining Zhang

    (College of Mining Engineering, Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
    Deep Earth Energy Laboratory, Department of Civil Engineering, Monash University, Building 60, Melbourne, VIC 3800, Australia)

  • Weiguo Liang

    (College of Mining Engineering, Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

  • Pathegama Gamage Ranjith

    (Deep Earth Energy Laboratory, Department of Civil Engineering, Monash University, Building 60, Melbourne, VIC 3800, Australia)

  • Wei He

    (College of Mining Engineering, Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

  • Zhigang Li

    (College of Mining Engineering, Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

  • Xiaogang Zhang

    (Deep Earth Energy Laboratory, Department of Civil Engineering, Monash University, Building 60, Melbourne, VIC 3800, Australia)

Abstract

Coal deformation is one of the leading problems for carbon dioxide (CO 2 ) sequestration in coal seams especially with respect to different-phase CO 2 injection. In this paper, a series of core flooding tests were conducted under different confining stresses (8–20 MPa), injection pressures (1–15 MPa), and downstream pressures (0.1–10 MPa) at 50 °C temperature to investigate the effects of coal deformation induced by adsorption and effective stress on sub-critical, super-critical, and mixed-phase CO 2 permeability. Due to the linear relationship between the mean flow rate and the pressure gradient, Darcy Law was applied on different-phase CO 2 flow. Experimental results indicate that: (1) Under the same effective stress, sub-critical CO 2 permeability > mixed-phase CO 2 permeability > super-critical CO 2 permeability. (2) For sub-critical CO 2 flow, the initial volumetric strain is mainly attributed to adsorption-induced swelling. A temporary drop in permeability was observed. (3) For super-critical CO 2 flow, when the injection pressure is over 10 MPa, effective-stress-generated deformation is dominant over the adsorption-induced strain and mainly contributes to the volumetric strain change. Thus, there is a linear increase of the volumetric strain with mean pore pressure and super-critical CO 2 permeability increased with volumetric strain. (4) For mixed-phase CO 2 flow, coupling effects of adsorption-induced swelling and effective stress on the volumetric strain were observed but effective stress made more of a contribution. CO 2 permeability consistently increased with the volumetric strain. This paper reveals the swelling mechanism of different-phase CO 2 injections and its effect on coal permeability.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:11:p:2926-:d:178595
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    References listed on IDEAS

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    3. 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.
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