Interfacial tension between CO2 and brine (NaCl + CaCl2) at elevated pressures and temperatures: The additive effect of different salts

• Published in: Advances in water resources Vol. 34; no. 4; pp. 505 - 511
• Main Authors: AGGELOPOULOS, C. A, ROBIN, M, VIZIKA, O
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier 01-04-2011
• Subjects: Additives; Aquifers; Carbon dioxide; Earth sciences; Earth, ocean, space; Exact sciences and technology; Hydrology. Hydrogeology; Interfacial tension; Saline; Salinity; Salt water; Water resources; experimental studies; salinity; cations; tension; salt; Brine; concentration; pressure; storage; chemically precipitated rocks; C0; evaporites; Saline aquifers; sedimentary rocks; brines; water resources; aquifers; solution; Interfacial tension; temperature; laboratory studies
• ISSN: 0309-1708; 1872-9657
• DOI: 10.1016/j.advwatres.2011.01.007

An extensive laboratory study was conducted to measure the interfacial tension (IFT) between CO2 and brine consisting in equal molal concentrations of NaCl and CaCl2. The experiments were repeated at various pressures, temperatures and salinities that are representative of conditions prevailing during CO2 storage in deep saline aquifers. The dependence of CO2/brine IFT on pressure and temperature is similar to that previously reported for the systems: CO2/NaCl solution and CO2/CaCl2 solution. CO2/brine IFT increases linearly with water salinity and the magnitude of this increase was found equal to the sum of the individual CO2/NaCl solution and CO2/CaCl2 solution IFT increments, indicating a strong additive effect on IFT when the brine is composed of various salts.