Journal of Soil and Groundwater Environment (한국지하수토양환경학회지:지하수토양환경)

Korean Society of Soil and Groundwater Environment (한국지하수토양환경학회)
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Measuring Interfacial Tension between Brine and Carbon Dioxide in Geological CO2 Sequestration Conditions using Pendant Bubble Methods

수적(垂滴)법을 이용한 이산화탄소 지중저장 조건에서의 염수-이산화탄소 간 계면장력 측정

  • Park, Gyuryeong (Department of Energy Resources Engineering, Pukyong National University) ;
  • An, Hyejin (Department of Energy Resources Engineering, Pukyong National University) ;
  • Kim, Seon-ok (Department of Energy Resources Engineering, Pukyong National University) ;
  • Wang, Sookyun (Department of Energy Resources Engineering, Pukyong National University)
  • 박규령 (부경대학교 에너지자원공학과) ;
  • 안혜진 (부경대학교 에너지자원공학과) ;
  • 김선옥 (부경대학교 에너지자원공학과) ;
  • 왕수균 (부경대학교 에너지자원공학과)
  • Received : 2016.08.30
  • Accepted : 2016.12.13
  • Published : 2016.12.31
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Abstract

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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References

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