This short monograph focuses on the theoretical backgrounds and
practical implementations concerning the thermodynamic modeling of
multiphase equilibria of complex reservoir fluids using cubic equations
of state. It aims to address the increasing needs of multiphase
equilibrium calculations that arise in the compositional modeling of
multiphase flow in reservoirs and wellbores.
It provides a state-of-the-art coverage on the recent improvements of
cubic equations of state. Considering that stability test and flash
calculation are two basic tasks involved in any multiphase equilibrium
calculations, it elaborates on the rigorous mathematical frameworks
dedicated to stability test and flash calculation. A special treatment
is given to the new algorithms that are recently developed to perform
robust and efficient three-phase equilibrium calculations.
This monograph will be of value to graduate students who conduct
research in the field of phase behavior, as well as software engineers
who work on the development of multiphase equilibrium calculation
algorithms.