Miscibility determination from gas-oil interfacial tension and P-R equation of state

Document Type

Article

Publication Date

1-1-2007

Abstract

Recently a new experimental technique of vanishing interfacial tension (VIT) has been developed to enable rapid and cost-effective determination of miscibility in gas-oil systems. In this study, VIT experiments have been extended to two standard gas-oil systems of n-decane-CO2 and live decane-CO2 at elevated pressures and temperatures. The VIT miscibilities of the two standard gas-oil systems and the two reservoir crude oil-gas systems, namely Rainbow Keg River (RKR) and Terra Nova, were compared with Peng-Robinson (P-R) equation of state (EOS) calculations. The close match of VIT miscibilities with other conventional experimental techniques in the standard gas-oil systems, as well as the reasonable match obtained with untuned PR-EOS calculations for several systems studied, clearly demonstrates the sound conceptual basis of VIT technique to determine fluid-fluid miscibility in multi-component hydrocarbon systems.

Publication Source (Journal or Book title)

Canadian Journal of Chemical Engineering

First Page

302

Last Page

312

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