Development of an Efficient Algorithm for the Calculation of Two-Phase Flash Equilibria

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Abstract
Summary: This paper details the development of an efficient algorithm for the calculation of two-phase equilibrium in multicomponent hydrocarbon systems with an equation of state (EOS). A number of numerical solution algorithms are evaluated for speed and robustness. To ensure generality, the compositions used in the study range from a synthetic 3-component fluid to a real 20-component reservoir fluid, and the calculations are performed at different positions on the fluid-phase diagram. The results of the study are used in the construction of a stable and efficient algorithm. Although the method was developed with reservoir engineering applications in mind, it should also be applicable in chemical, process, and petroleum engineering.

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