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首页> 外文期刊>Fluid Phase Equilibria >Three-phase free-water flash calculations using a new Modified Rachford-Rice equation
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Three-phase free-water flash calculations using a new Modified Rachford-Rice equation

机译：使用新的修正Rachford-Rice方程进行三相自由水闪蒸计算

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摘要

A novel Modified Rachford-Rice equation is developed for three-phase equilibrium calculations in hydrocarbon-water systems, based on the free-water assumption, i.e., the water-rich liquid phase consists of pure water only. In the inner loop of the flash algorithm, the three-phase problem (consisting in a system of two non-linear equations) is replaced by a pseudo-two-phase problem (consisting in a non-linear equation). Unlike previous formulations, the new Modified Rachford-Rice function is guaranteed to monotonically decrease between two adjacent asymptotes. The negative flash concept is used, and a search window is proposed for the vapor fraction. The new free-water flash method proved to be robust, and excellent agreement between full three-phase flash and pseudo-two-phase free-water flash was obtained for various test problems. The proposed method is very useful in compositional reservoir simulation of certain oil recovery methods and in process simulation.
机译：基于自由水假设，即富含水的液相仅由纯水组成，开发了一种新颖的Modified Rachford-Rice方程用于烃-水系统中的三相平衡计算。在flash算法的内部循环中，三相问题（由两个非线性方程式组成）由伪两相问题（由非线性方程式组成）代替。与以前的公式不同，新的修改的Rachford-Rice函数可以保证在两个相邻渐近线之间单调递减。使用负闪蒸概念，并为蒸气分数提出了搜索窗口。新的自由水闪蒸方法被证明是鲁棒的，并且针对各种测试问题，获得了完全三相闪蒸和伪两相自由水闪蒸的极好的一致性。该方法在某些采油方法的组成油藏模拟和过程模拟中非常有用。

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