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This experimental study was aimed to estimate interfacial tension of brine-$CO_2$ by using a pendant bubble method and image analysis. Measurements were performed for wide ranges of temperatures, pressures, and salinities covering reservoir conditions in Pohang basin, a possible candidate for $CO_2$ storage operation in Korea. The profiles of $CO_2$ bubbles in brine obtained from image analysis with the densities of brine and $CO_2$ from previous studies were applied to Laplace-Young equation for calculating interfacial twnsion in brine-$CO_2$ system. The experimental results reveals that the interfacial tension is significantly affected by reservoir conditions such as pressure, temperature and water salinity. For conditions of constant temperature and water salinity, the interfacial tension decreases as pressure increases for low pressures (P < $P_c$), and approaches to a constant value for high pressures. For conditions of constant pressure and water salinity, the interfacial tension increases as temperature increases for T < $T_c$, with an asymptotic trend towards a constant value for high temperatures. For conditions of constant pressure and temperature, the interfacial tension increases with increasing water salinity. The trends in changes of interfacial tension can be explained by the effects of the reservoir conditions on the density difference of brine and $CO_2$, and the solubility of $CO_2$ in brine. The information on interfacial tensions obtained from this research can be applied in predicting the migration and distribution of injecting and residual fluids in brine-$CO_2$-rock systems in deep geological environments during geological $CO_2$ sequestrations.
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참고문헌 (19)
참고문헌 신청
Aggelopoulos, C.A. / 2010 / CO2/CaCl2 solution interfacial tensions under CO2 geological storage conditions: influence of cation valence on interfacial tension / Adv. Water Resour 33:691~697
Aggelopoulos, C.A. / 2011 / Interfacial tension between CO2 and brine (NaCl + CaCl2) at elevated pressures and temperatures: The additive effect of different salts / Adv. Water Resour 34:505~511
Andreas, J.M. / 1938 / Boundary tension by pendant drops / J. Phys. Chem 42:1001~1019
Akiba, H. / 2016 / Surface tension between CO2gas and tetra-n-butylammonium bromide aqueous solution / J. Chem. Thermodyn 92:72~75
Arashiro, E.A. / 1999 / Use of the pendant drop method to measure interfacial tension between molten polymers / Mat. Res 2(1):23~32
Aggelopoulos, C.A. / 2011 / Interfacial tension between CO2 and brine (NaCl + CaCl2) at elevated pressures and temperatures: The additive effect of different salts / Adv. Water Resour 34:505~511
Andreas, J.M. / 1938 / Boundary tension by pendant drops / J. Phys. Chem 42:1001~1019
Akiba, H. / 2016 / Surface tension between CO2gas and tetra-n-butylammonium bromide aqueous solution / J. Chem. Thermodyn 92:72~75
Arashiro, E.A. / 1999 / Use of the pendant drop method to measure interfacial tension between molten polymers / Mat. Res 2(1):23~32
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