水平管油-气-水三相流压力梯度变化特性

Variation characteristics of pressure gradient for oil-gas-water three-phase flow in horizontal pipeline

在内径50 mm、长40 m的不锈钢水平环道内,利用压力传感器对油-气-水三相管流压力波动特性进行试验研究,从流型的观点分析三相管流平均压力梯度随液相中入口体积含水率、气相折算速度以及液相折算速度的变化规律。结果表明:油-气-水三相管流条件下的转相点对应的入口体积含水率为40%,低于油水两相管流转相点对应的体积含水率(60%),油-气-水三相流动转相的发生与折算液速、折算气速和液相含水率均有关;Lockhart&Martinelli两相模型可以用来预测AN‖O/W流型的油-气-水三相流动压力梯度。

Fluctuation characteristics of pressure gradient for gas-oil-water three-phase flow were experimentally investigated by use of pressure sensors in the horizontal stainless steel pipe with the inner diameter of 50 mm and the length of 40 m. From the view of flow regime, the influences of input water cut in liquid, gas superficial velocity and liquid superficial veloci- ty on pressure gradient were analyzed. The results show that input water cut of phase inversion in three-phase flow was about 40% , which was lower than that in oil-water two-phase flow （ about 60% ）. For gas-oil-water three-phase flow, water cut for point of phase inversion was related to gas superficial velocity, liquid superficial velocity and input water cut in liquid. Lock- hart ＆ Martinelli two-phase model could predict oil-gas-water three-phase pressure gradient of AN｜｜ O/W flow regime. K