Abstract
AbstractRecently 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.
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