A simulator for the study of phase behaviour based on the SOAVE equation of state and material balance calculations.
Abstract
This paper shows the predictive features, speed and accuracy of a phase behavior simulator which calculates and analyzes the vapor-liquid equilibrium of volatile oils and gas condensates. The simulator calculates the PVT properties (gas volumetric factor (Bg), oil volumetric factor (Bo), gas/ oil ratios (Rso, Rsg) required by reservoir simulators and used in two-phase flow equations and reservoir material balances.The model uses the Soave-Redlich-Kwong equation of state (SRK-EOS) to predict phase behavior without any parameter adjustment. lt only utilizes the concept of volume translation and a simple C7+ characterization. A rigorous material balance checks the consistency of the measured PVT data and· calculates properties such as: liquid composition at different pressures, K values, molecular weight, liquid densities and PVT properties, among others. The C7+ characterization method used by the simulator was compared to that presented by Pedersen et al. (1984). The CPU time in the constant volume depletion test (CVD) was significantly reduced (up to 80%) by using the simple C1+ characterization method.
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