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    Micro-scale fracturing mechanisms in coal induced by adsorption of supercritical CO2

    252472.pdf (2.647Mb)
    Access Status
    Open access
    Authors
    Zhang, Y.
    Zhang, Z.
    Sarmadivaleh, Mohammad
    Lebedev, Maxim
    Barifcani, Ahmed
    Yu, H.
    Iglauer, Stefan
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhang, Y. and Zhang, Z. and Sarmadivaleh, M. and Lebedev, M. and Barifcani, A. and Yu, H. and Iglauer, S. 2017. Micro-scale fracturing mechanisms in coal induced by adsorption of supercritical CO2. International Journal of Coal Geology. 175: pp. 40-50.
    Source Title
    International Journal of Coal Geology
    DOI
    10.1016/j.coal.2017.04.002
    ISSN
    0166-5162
    School
    Department of Petroleum Engineering
    URI
    http://hdl.handle.net/20.500.11937/52992
    Collection
    • Curtin Research Publications
    Abstract

    Coal bed methane production can be assisted by CO2 injection. However, CO2 adsorption in the coal matrix leads to a dramatic reduction in permeability and an associated change in microstructure caused by coal matrix swelling. Furthermore, it has been recently observed that the induced swelling stress fractures the unswelling (mineral) phase in laboratory investigations. However, the failure mechanisms are still not understood, and the way internal swelling stresses are generated is not clear. Thus, in this paper, we propose a new method which combines X-ray microtomography imaging, nanoindentation testing and DEM modelling with which we can predict the rock mechanical performance at micro scale. Indeed we successfully simulated such swelling processes inside a coal sample, including a simulation of the fracture mechanism of the mineral phase, and a quantification of the in-situ von Mises stresses generated by swelling. We conclude that our proposed method is an efficient way for analysis and prediction of coal microfracturing and the associated microscale rock mechanical behavior.

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