一种旋流+膜联合油水分离器流场数值模拟

Numerical Simulation of Flow Field in Swirl+Membrane Combined Oil-Water Separator

相对于单原理油水分离方法而言,利用旋流+膜联合原理进行油水分离是一种新的油水分离方式。为提高井下油水分离性能,探讨一种联合原理的油水分离器。建立旋流+膜联合油水分离器的物理数学模型,并用数值模拟的方法计算其中的流场分布规律,针对不同分流比、入口流速和入口含油体积分数对其性能进行系统研究。结果表明:分流比的变化影响第一级和第二级出油口相汇流动规律,应用时应进行性能核算从而保证两级分离的效果;随着入口流速的增大,旋流+膜分离性能逐渐更优,若流速过低,则旋流+膜分离性能较差;随着入口含油体积分数增大,旋流所分离的油相占比减小,留给膜分离的油相占比增大,即含油体积分数较大时,旋流+膜联合油水分离的应用更有必要。

Compared with the single principle oil-water separation method,the combined principle of swirl+membrane is a new oil-water separation method.In order to improve the performance of downhole oil-water separation,a combined principle oil-water separator is discussed.The physical and mathematical model of swirl+membrane combined oil-water separator is established.The flow field distribution is calculated by the numerical simulation method.The effects of different split ratios,inlet flow velocities and inlet oil volume fractions on the performance are systematically studied.The results show that:the change of split ratio affects the flow rule of the first stage and the second stage oil outlet,and performance accounting should be carried out to ensure the effect of two-stage separation;with the increase of inlet flow rate,the performance of swirl+membrane separation becomes better,and the performance of swirl+membrane separation is poor when the flow rate is too low;with the increase of inlet oil volume fraction,the proportion of oil phase separated by swirl decreases,and the proportion of oil phase left for membrane separation increases,that is,when the oil volume fraction is high,the application of swirl+membrane combined oil-water separation is more necessary.