The Prediction of the PVT/phase Behavior of the Geothermal Fluid Mixtures

Abstract

fluid systems plays a very important role in reservoir performance and energy production studies. In this study, two methods to predict the behavior of geothermal systems were evaluated. As a first attempt, the use of a cubic equation of state (EOS) was applied. Experimental data were matched with the Peng-Robinson EOS and a strong dependence of binary interaction coefficients to temperature was observed The use of experimental correlations giving the solubility of and related properties was observed more convenient for this purpose at the pressuretemperature- concentration ranges that are typical for geothermal reservoirs. Therefore, a PVT package which calculates the of systems using empirical correlations was developed. As a second step, the effects of salt content on the thermodynamic properties of geothermal fluids were added into the PVT package developed in the present study. Then, the use of the PVT package for different purposes was evaluated incorporating it into prepared to model reservoir performance and wellbore flow including calcite deposition modeling.