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与常规的油-气-水三相流动相比,低持液率三相流动混合物由于液体含量极少,因而具有独特的流动特性,使得对其持液率和管输压降的预测更加困难。针对低含液湿天然气的集输特点,根据流体力学的基本原理,建立了用于预测管道内油-气-水三相混合物的持液率和管输压降模型,简化了关于湿壁分数、液-壁摩擦因子、界面摩擦因子、油水混合粘度的经验闭合关系式,提出了液滴夹带的气体流速判断条件,并考虑气液界面之间的非水平特点,给出了曲面气液界面的处理方法。模型的计算结果与室内实验结果吻合较好,能够较准确地预测管道内油-气-水三相混合物的持液率和管输压降等流动参数,对于低持液率湿天然气管道的设计和运营管理等具有很好的指导作用。
Compared with the conventional oil-gas-water three-phase flow, the low-liquid-rate three-phase flow mixture has unique flow characteristics due to its very low liquid content, making it more difficult to predict its liquid holdup and pressure drop . According to the characteristics of gas gathering and transportation of low hydrocarbon-containing wet gas, a model for predicting liquid holdup and pipe pressure drop of oil-gas-water three-phase mixture in pipeline was established according to the basic principles of fluid mechanics, , Liquid-wall friction factor, interfacial friction factor and oil-water mixing viscosity, the condition of determining the gas flow rate of the entrained liquid droplets is put forward. Considering the non-horizontal characteristics of gas-liquid interface, The method of treatment. The calculated results of the model are in good agreement with the experimental results in the laboratory and can predict the flow parameters such as liquid holdup and pipe pressure drop of the oil-gas-water three-phase mixture in the pipeline more accurately. And operations management has a good guide.