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    Drivers of pH increase and implications for low salinity effect in sandstone

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    Fulltext not available
    Authors
    Chen, Yongqiang
    Xie, Sam
    Pu, W.
    Saeedi, Ali
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Chen, Y. and Xie, S. and Pu, W. and Saeedi, A. 2018. Drivers of pH increase and implications for low salinity effect in sandstone. Fuel. 218: pp. 112-117.
    Source Title
    Fuel
    DOI
    10.1016/j.fuel.2018.01.037
    ISSN
    0016-2361
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/66516
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Elsevier Ltd. Low salinity water flooding appears to be a cost-effective and environmentally friendly means to shift wettability of oil/brine/rock system towards more water-wet, thus improving hydrocarbon recovery. While the contribution of kaolinite (edge-charged clays) on low salinity effect has been extensively investigated, how basal-charged clays (e.g., illite, smectite, and chlorite) contributing to the low salinity effect remains unclear. We thus hypothesize that low salinity water facilitates ion exchange in the presence of basal charged clays, thus lifting off oil films from pore surfaces. To test the hypothesis, we performed a geochemical study using PHREEQC in light of double layer diffuse theory. We quantitatively interpreted the pH increase and low salinity effect from corefloods conducted by RezaeiDoust et al. [RezaeiDoust A, Puntervold T, Austad T. Chemical verification of the EOR mechanism by using low saline/smart water in sandstone. Energy & Fuels. 2011;25(5):2151–62.]. We demonstrate that low salinity water triggers a pH increase at the presence of basal-charged clays, thus a more water-wet because of ion exchange. We therefore expand the application envelope of low salinity water flooding to reservoirs with basal-charged clays.

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