关键词: 油水分散流 , 反相点 , 反相特性 , 两相共存区

Abstract: Oil-water dispersed flow is one of the liquid-liquid two-phase main flow patterns encountered in pipeline operations, in which phase inversion will occur. The flow characteristics of the dispersion and pressure drop change abruptly and significantly at or near the phase inversion point, which will exert dramatically adverse influence on pipeline operations. In this paper three oil samples of different viscosities were used as test fluids. Data analysis showed that pressure gradient of three kinds of oil samples behaved differently in the phase inversion process, mainly reflected in the “climbing stage” and “leaping stage”, at the phase inversion point under two different experiments (starting from water dominated mixtures gradually to oil dominated mixtures or reverse) and the O/W or W/O dispersions forming process. However, when far away from phase inversion point, pressure gradient exhibited slight difference. The effect of mixture flow rate on the ambivalent range depends on the viscosity of oil. At the same mixture flow rate, the ambivalent range decreased with viscosity increasing. Droplets changed their shapes after phase inversion and double dispersed system appeared in the water to oil dominated mixtures experiment.

Key words: Oil-water dispersed flow, Point of inversion, Inversion characteristics, Ambivalence range