The technology of oil-air-water mixed transportation had been applied in offshore pipelines, so it was very necessary to study the characteristic of three- phase flow. A series of oil- air- water three- phase flow experiments were carried out in a inner diameter of 25.7 mm, horizontal, stainless steel pipe, the focus was to study three-phase flow patterns and oil-water phase inversion. Air, tap water and white mineral oil (20 mPa · s viscosity, 855 kg/m3 density at 20 ℃) were used as test fluids. High speed photography was applied to determine flow patterns. Three- phase flow pattern maps on difference of the water volume fracture in the oil-water mixture (water-cut) were plotted, the effects of water-cut on three -phase flow patterns were investigated. The flow pattern maps developed were compared with a theoretical model, and it show that the model provides very close flow pattern predictions from experimental data at low water-cut.%油气水三相混输技术已在海洋和沙漠油田得到广泛的应用,三相流动规律的研究是十分必要的.在长62 m、内径25.7 mm的不锈钢管水平环道上,对油气水三相流型及油水反相进行了实验研究.实验油品的粘度为20 mPa·s(20℃),密度为855kg/m3(20℃).利用高速摄像技术,结合目测来判别流型,绘制了不同含水率情况下的油气水三相流型图.分析了含水率变化对三相流型的影响,并与经典的Taitel流型预测模型进行了对比,发现该模型适合于低含水率下的油气水三相流型预测.
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