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    Swelling-induced changes in coal microstructure due to supercritical CO2 injection

    245752_245752.pdf (1.948Mb)
    Access Status
    Open access
    Authors
    Zhang, Y.
    Lebedev, Maxim
    Sarmadivaleh, M.
    Barifcani, Ahmed
    Iglauer, Stefan
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhang, Y. and Lebedev, M. and Sarmadivaleh, M. and Barifcani, A. and Iglauer, S. 2016. Swelling-induced changes in coal microstructure due to supercritical CO2 injection. Geophysical Research Letters. 43 (17): pp. 9077-9083.
    Source Title
    Geophysical Research Letters
    DOI
    10.1002/2016GL070654
    ISSN
    0094-8276
    School
    School of Chemical and Petroleum Engineering
    Remarks

    Copyright © 2016 The American Geophysical Union

    URI
    http://hdl.handle.net/20.500.11937/22445
    Collection
    • Curtin Research Publications
    Abstract

    ©2016. American Geophysical Union. All Rights Reserved. Enhanced coalbed methane recovery and CO2 geostorage in coal seams are severely limited by permeability decrease caused by CO2 injection and associated coal matrix swelling. Typically, it is assumed that matrix swelling leads to coal cleat closure, and as a consequence, permeability is reduced. However, this assumption has not yet been directly observed. Using a novel in situ reservoir condition X-ray microcomputed tomography flooding apparatus, for the first time we observed such microcleat closure induced by supercritical CO2 flooding in situ. Furthermore, fracturing of the mineral phase (embedded in the coal) was observed; this fracturing was induced by the internal swelling stress. We conclude that coal permeability is drastically reduced by cleat closure, which again is caused by coal matrix swelling, which again is caused by flooding with supercritical CO2.

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