Electrochemical investigation of the effect of temperature, salinity and salt type on brine/mineral interfacial properties

Muhammad Arif, Franca Jones, Ahmed Barifcani, Stefan Iglauer

    Research output: Contribution to journalArticlepeer-review

    52 Scopus citations

    Abstract

    CO2wettability of minerals and CO2/brine interfacial tension are critical parameters that significantly influence the underground geological storage of CO2. These interfacial phenomena are proven to be a function of pressure, temperature, salinity and salt type. However, there is a clear lack in understanding of the principal mechanisms such as the electrochemical interactions at the brine/mineral interface, which are responsible for altering wettability. Moreover, the literature lacks experimental data on contact angle and interfacial tension for a broad range of salinity conditions. Therefore, in this article, we investigated the electrochemical processes at the brine/mica interface by measuring the zeta potentials of brine/mica systems as a function of temperature (298 K–343 K), salinity (0 wt% NaCl–5 wt% NaCl) and salt type (NaCl, CaCl2, MgCl2) and we measured advancing and receding contact angles for the same experimental matrix to derive the relationship between surface charge (at the brine/mineral interface) and wettability. Further, we measured advancing and receding contact angles for 20 wt% CaCl2and 20 wt%MgCl2at high pressures (0.1 MPa–20 MPa) and a temperature of 323 K, and CO2-brine interfacial tensions for the same conditions to allow wettability characterization at a broader scale. Such investigations are aimed at understanding and reducing the risk associated with CO2geo-storage projects, by allowing the conceptual understanding of the factors influencing wettability. Finally, we provided a guided estimate of CO2column heights that can be permanently immobilized beneath the caprock, and we found that elevated temperature and less saline brine lead to better storage capacities.

    Original languageBritish English
    Pages (from-to)136-147
    Number of pages12
    JournalInternational Journal of Greenhouse Gas Control
    Volume59
    DOIs
    StatePublished - 2017

    Keywords

    • Brine
    • Interfacial tension
    • Wettability
    • Zeta potential

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