Prediction of dew points and liquid dropouts of gas condensate mixtures

Thermodynamic modeling of reservoir fluids behavior is of great importance for the oil and gas industry. For design and safe operation purposes, it is necessary to have an accurate, simple and robust model for the prediction of the phase equilibrium of reservoir fluids. In this work, the UMR-PRU model is applied in the prediction of dew points and liquid dropouts of gas condensate mixtures, and is compared with the widely used cubic equations of state Soave-Redlich-Kwong (SRK) and Peng-Robinson (PR) as well as the non-cubic Perturbed Chain Statistical Associating Fluid Theory (PC-SAFT) equation of state. The evaluation of the models was based both on synthetic and real gas condensate mixtures. For real gas condensates, a characterization method for the C7+ fraction based on the one proposed by Pedersen is developed for UMR-PRU. The results reveal that UMR-PRU is a sufficiently accurate model for dew point and liquid dropout predictions of gas condensates.