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    Residual trapping of supercritical CO2 in oil-wet sandstone

    238474_238474.pdf (2.143Mb)
    Access Status
    Open access
    Authors
    Rahman, T.
    Lebedev, Maxim
    Barifcani, Ahmed
    Iglauer, S.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Rahman, T. and Lebedev, M. and Barifcani, A. and Iglauer, S. 2016. Residual trapping of supercritical CO2 in oil-wet sandstone. Journal of Colloid and Interface Science. 469: pp. 63-68.
    Source Title
    Journal of Colloid and Interface Science
    DOI
    10.1016/j.jcis.2016.02.020
    ISSN
    0021-9797
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/10927
    Collection
    • Curtin Research Publications
    Abstract

    Residual trapping, a key CO2 geo-storage mechanism during the first decades of a sequestration project, immobilizes micrometre sized CO2 bubbles in the pore network of the rock. This mechanism has been proven to work in clean sandstones and carbonates; however, this mechanism has not been proven for the economically most important storage sites into which CO2 will be initially injected at industrial scale, namely oil reservoirs. The key difference is that oil reservoirs are typically oil-wet or intermediate-wet, and it is clear that associated pore-scale capillary forces are different. And this difference in capillary forces clearly reduces the capillary trapping capacity (residual trapping) as we demonstrate here. For an oil-wet rock (water contact angle θ = 130°) residual CO2 saturation SCO2,r (≈8%) was approximately halved when compared to a strongly water-wet rock (θ = 0°; SCO2,r ≈ 15%). Consequently, residual trapping is less efficient in oil-wet reservoirs.

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