Abstract
Summary This paper presents the new general cubic equation of state (EOS) for predicting phase and volumetric behavior of natural multicomponent systems under pressure and temperature conditions that conform to reservoir engineering processes. A new effective method to calculate the critical pressure of C5+ or C7+ fractions in reservoir fluids is presented. The method is of great importance for successful simulation at pressures greater than 25 MPa and can be used with any cubic EOS. The results of the mathematical simulation are described and the effects of porous media on phase behavior for natural multicomponent systems and of capillary pressure on dew- and bubblepoint parameters are investigated.
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