高含水期水平管油气水三相流动数值模拟

由于油气水三相间存在着不稳定的混合界面,在不同的条件下可产生多种流型。采用VOF多相流模型对水平管道中油气水三相流动进行数值模拟,得出在不同含气体积分数、含油体积分数、黏度及流速条件下油气水三相在水平管道中流动的相分布图。分析可知,在高含水期,随着含气体积分数的增加,流型由气泡流发展成分层流;随着混合物流速的增长,流型由分层流发展成段塞流。含气体积分数和混合物流速对流型有较大的影响。含油体积分数和原油黏度对流型的影响不明显。计算结果与相关理论比较吻合,对实际工程具有一定的指导意义。

Numerical Simulation of Oil-Gas-Water Three Phase Flow in Horizontal Pipeline during the High Water-Cut Period

Due to the oil-gas-water three phase existing unstable mixing interface, it can produce a variety of flow patterns in different conditions. The oil-gas-water three phase in horizontal pipeline flow by numerical simulation of VOF model of multiphase flow was studied, and it gets the phase distribution diagram of oil-gas-water three phase in horizontal pipeline flow in different conditions of volume gas fraction, oil fraction, viscosity and velocity. The analysis shows that, during the high water-cut period, with the increasing of the volume air fraction, flow patterns develop from the bubble flow to the laminar flow~ with the increasing of the mixture velocity, flow patterns develop from the laminar flow to slug flow. Volume air fraction and mixture velocity have a major influence on flow pattern. And volume oil rate and viscosity of crude oil do not. Calculation results are fitted with the related theory, which has some guiding significance for actual engineering.