### Abstract

Assuming that the number densities of each component in a mixture
are linearly distributed across the interface between the
coexisting vapor-liquid or liquid-liquid phases, we developed in
this research work a linear-gradient-theory (LGT) model for
computing the interfacial tension of hydrocarbon-water mixtures on
the basis of the SRK equation of state. With this model, it is
unnecessary to solve the time-consuming density-profile equations
of the gradient-theory model. In addition, a correlation was
developed for representing the effect of electrolytes on the
interfacial tension of hydrocarbon-brine systems. The new model
was tested on a number of hydrocarbon-water/brine mixtures and two
crude oil-water systems under reservoir conditions. The results
show good agreement between the predicted and the experimental
interfacial tension data.

Original language | English |
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Journal | In Situ |

Volume | 22 |

Issue number | 2 |

Pages (from-to) | 157-180 |

Publication status | Published - 1998 |

## Cite this

Zuo, Y-X., & Stenby, E. H. (1998). Calculation of Interfacial Tensions of Hydrocarbon-water
Systems under Reservoir Conditions.

*In Situ*,*22*(2), 157-180.