Development of a Vapor-Liquid-Equilibrium Module for Reservoir Simulation
Arthur Besen Soprano1; António Fábio Carvalho da Silva2
1 Engineering Simulation and Scientific Software - ESSS; 2 Universidade Federal de Santa Catarina - UFSC
doi:10.20906/CPS/CILAMCE2017-0335
Resumo
This work presents the study and implementation of a vapor-liquid-equilibrium (VLE) module that to be used in reservoir simulation models. The formulation assumes an arbitrary number of components distributed in the oil and gas phases, with the chemical equilibrium being solved only in oil and gas phases. In the model, flash calculations and the stability test based on the minimization of Gibbs free energy are solved using a more advanced and robust procedure, combining the Newton method with a successive substitution procedure. To validate the model, comparisons are made with the results obtained with a commercial PVT simulator and the results showed good agreement. The implementation of the model and all the numerical modules used in this work were done with advanced programming techniques in C++, allowing code reuse for solving multicomponent thermodynamic problems, which require the use of a cubic equation of state. Moreover, is it presented a procedure for calculating black oil model properties based on a compositional analysis which can be useful in order to generate input fluid data for black-oil reservoir simulators.
Palavras-chave: vapor-liquid equilibrium; compositional model; reservoir simulation; black-oil