In this paper, we describe a method for characterization of crude oils for predictions of phase behavior of CO2 /crude oil mixtures with an equation of state (EOS). The method includes the use of supercritical fluid chromatography (SFC) with CO2 as the carrier fluid. Pressure-composition diagrams calculated using the the Peng-Robinson EOS and this characterization scheme agree well with PVT observations.

The advantage of this technique is that it produces predictions of the phase behavior of CO2/crude oil mixtures with much less experimental effort than is required to perform PVT experiments.

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