Compositional characterization of fluids based on EoS´s: From reservoir to separation plants

GILARDONE, CARLOS; TASSIN, NATALIA GISELLE; CANEL, CARLOS; CISMONDI, MARTÍN

Villa Carlos Paz

Congreso; XI Iberoamerican Conference on Phase Equilibria; 2018

Universidad Nacional de Córdoba

The simulation of reservoir fluids thermodynamic behavior based on equations of state (compositional method) has been and will continue to be of increasing importance in the oil and gas industry. This is due to different reasons, including the recent discoveries of deeper reservoirs, with temperatures and pressures higher than usual, which are often associated to very volatile oils, rich gas condensates and near critical fluids. The material balance models, integral models (Material Balance + Nodal Analysis + Production Network) and numerical simulators need to have compositional characterization routines in order to model the behaviour of these reservoir fluids, production facilities and wells. Sometimes it is necessary to study projects of miscible gas reinjection and gas cycling, where the use of compositional characterization is unavoidable. During the last years, the development of Shale Gas and Shale Oil resources in Argentina has become more intensive. Many of these reservoirs also contain fluids with high volatility, high condensation and near critical behaviour, but deposition problems with waxes and asphaltenes have also appeared in many wells, and all of this requires predictive models for solid-fluid and liquid-liquid-vapor equilibria respectively, in order to assist engineering designs. In this work we characterize different volatile oil and gas condensate samples, and tune an equation of state (EoS) model based on laboratory PVT studies and rheological studies detecting the appearance of a solid phase