XXSim Reservoir Simulator
3-phase flash EOS based with fully implicit formulation
XXSim Reservoir Simulator is an Equation of State (EOS) based general purpose compositional reservoir simulator with fully implicit formulation. XXSim uses the most advanced thermal and non-thermal recovery models equipped with fully coupled EOS three phase flash and three-phase separator. The three-phase flash algorithm uses the three-phase (aqueous, oilic, vapour) equation of state to calculate the solubility of every component in each phase, or the number of moles of every component in each phase.
For example; Carbon dioxide can exist at the same time in oil phase, aqueous phase and gas phase. How to calculate the number of moles of CO2 in each phase? Literature reviews show that all commercial reservoir simulators use table of CO2 solubility in water, or Henry’s law.
This may work well for simple steam injection but could be unstable or produce wrong results in more advanced EOR processes,such as in-situ solvent+steam injection or CO2+steam injection. They use two-phase flash or pseudo three-phase flash and have to neglect solubility of water in oil phase and C20+ or C30+ in gas phase in high temperature, etc.
In contrast to others, XXSim uses the innovative three-phase flash algorithm. It can be simplified to simulate the conventional or traditional black oil, compositional and thermal modules. In addition, it can be expanded to fully EOS based thermal simulator.
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