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International journal of heat and mass transfer v.121, 2018년, pp.503 - 513   SCI SCIE
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A new analysis of pressure dependence of the equilibrium interfacial tensions of different light crude oil–CO2 systems

Zhang, Kaiqiang (Petroleum Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, Regina, Saskatchewan S4S 0A2, Canada ) ; Tian, Leng (Faculty of Petroleum Engineering, China University of Petroleum Beijing, Beijing 102249, China ) ; Liu, Lirong (Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina, Saskatchewan S4S 0A2, Canada ) ;
  • 초록  

    Abstract In this paper, the equilibrium two-phase compositions are predicted and analyzed to elucidate the pressure dependence of the equilibrium interfacial tensions (IFTs) of three different light crude oil–CO 2 systems. First, three series of the dynamic IFT tests for a dead light crude oil–pure CO 2 system, a live light crude oil–pure CO 2 system, and a dead light crude oil–impure CO 2 system at different equilibrium pressures from the literature are used. Second, the modified Peng–Robinson equation of state (PR-EOS) is tuned by using measured pressure–volume–temperature (PVT) data to predict the equilibrium two-phase compositions of the three light crude oil–CO 2 systems. Such tuned PR-EOS together with the parachor model is applied to predict the equilibrium IFTs, which are compared with and validated by the measured IFT data. Third, the pressure dependence of the equilibrium IFTs, the initial oil and gas composition effects, and the initial gas fraction effect are examined. The density difference between the light crude oil and gas phase is found to be a key factor in the parachor model for the IFT predictions. The equilibrium IFT vs. pressure curve is found to have three different pressure ranges, which correspond well to those for the density difference. Moreover, the initial oil and gas compositions affect the equilibrium two-phase compositions and IFTs to different extents. The live light crude oil–pure CO 2 equilibrium IFT is reduced with an increased initial gas fraction. For the dead light crude oil–pure/impure CO 2 system, the miscibility with zero IFT can be achieved only if the initial gas phase has more than 0.70 mol fraction. Otherwise, it is the complete gas dissolution into the light crude oil that leads to zero IFT. Highlights A new analysis explain pressure dependence of light oil–CO 2 IFTs from PR EOS. Density difference is a key factor in the parachor model for the IFT predictions. Equilibrium IFT vs. pressure curve has three different ranges. Initial gas composition has a stronger effect on the IFTs. Miscibility can be achieved only if the initial gas is more than 0.70 mol fraction. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Equilibrium interfacial tensions .   Two-phase compositions .   Parachor model .   Peng–Robinson equation of state .   Light crude oil–CO2 systems.  

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