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    Gypsum solubility under pressure conditions relevant to CO2 geological storage

    Access Status
    Fulltext not available
    Authors
    Rendel, P.
    Gavrieli, I.
    Wolff-Boenisch, Domenik
    Ganor, J.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Rendel, P. and Gavrieli, I. and Wolff-Boenisch, D. and Ganor, J. 2016. Gypsum solubility under pressure conditions relevant to CO2 geological storage. International Journal of Greenhouse Gas Control. 55: pp. 15-22.
    Source Title
    International Journal of Greenhouse Gas Control
    DOI
    10.1016/j.ijggc.2016.10.017
    ISSN
    1750-5836
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/18610
    Collection
    • Curtin Research Publications
    Abstract

    Deep saline aquifers are among the preferred potential repositories for carbon dioxide Geological Storage (CGS). Modeling the interaction of the injected CO2 with the brine is essential for proper planning of CGS, including avoidance of local precipitation of minerals such as sulfates which may clog the injection borehole and decrease the injectivity of the surrounding rock mass. In the present study gypsum solubility at various molal concentrations of dissolved CO2 at pressures of up to 100 bar was investigated. A series of semi-batch experiments was performed in a novel flow-through reactor system, designed to withstand high pressures, temperatures and corrosion. Solubilities attained in the experiments match (within a 3% uncertainty) the new PHREEQC v.3's predictions (Appelo et al., 2014) in which pressure and dissolved CO2 concentrations are two of the new variables. Accordingly, gypsum solubility was found to increase as pressure rises and to decrease as CO2 concentration ascends.

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