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    Dilute iota- and kappa-Carrageenan solutions with high viscosities in high salinity brines

    Access Status
    Fulltext not available
    Authors
    Iglauer, Stefan
    Wu, Y.
    Shuler, P.
    Tang, Y.
    Goddard, W.
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Iglauer, Stefan and Wu, Yongfu and Shuler, Patrick and Tang, Yongchun and Goddard III, William A. 2011. Dilute iota- and kappa-Carrageenan solutions with high viscosities in high salinity brines. Journal of Petroleum Science and Engineering. 75 (3-4): pp. 304-311.
    Source Title
    Journal of Petroleum Science and Engineering
    DOI
    10.1016/j.petrol.2010.11.025
    ISSN
    09204105
    School
    Department of Petroleum Engineering
    URI
    http://hdl.handle.net/20.500.11937/9615
    Collection
    • Curtin Research Publications
    Abstract

    We evaluated the rheological characteristics of ι- and κ-Carrageenan in aqueous solutions. Viscosities strongly increased with increasing polymer concentration or salinity. Monovalent Na+ cations were more effective in increasing viscosity than divalent Ca2+ cations. A more complex brine containing Na+, Mg2+ and Ca2+ cations also showed high viscosities at a high salinity. We observed shear thinning behavior for these polysaccharide solutions. We explain these rheological phenomena with molecular processes, specifically the conformation change of the ι-Carrageenan from random coil to double helix. In the context of enhanced oil recovery, ι-Carrageenan solutions can reach much higher viscosities at high salinities than standard polyacrylamide solutions. Moreover, Carrageenans are renewable, nontoxic, green substances.

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