Reduced method for rapid multiphase isenthalpic flash in thermal simulation

摘要: Abstract Thermal enhanced oil recovery (EOR) involves the complex interplay of mass and energy transport processes with phase behavior. Hydrocarbon water components partition across multiple fluid phases as a function composition, pressure temperature. compositional simulation thus requires phase-equilibrium calculations for at least three phases. Isenthalpic flash (phase-split) is needed thermal when molar variables are used in solution global balances. solves compositions amounts, addition to Isothermal algorithms have been consistently refined over past four decades, whereas isenthalpic remains an outstanding challenge study petroleum reservoir thermodynamics. more challenging than isothermal number reasons. First, temperature unknown priori, resulting uncertainty regarding state. Second, narrow boiling point behavior results extremely nonlinear enthalpy respect Finally, EOR injection steam which hydrocarbon–water interactions elevated temperatures. Water thermodynamically dominant component this context, cannot be excluded from equilibrium processes. In research we address problem using reduced formulation. For first time, extend use beyond isothermal-isobaric domain phase-split calculations. We introduce fully coupled Newton method, exhibits rapid convergence even problems. Excellent performance our novel formulation demonstrated through comprehensive testing characterized fluids literature. expect developments fortify coupling conservation laws simulation.