为了明确含砂工况下分流比对水力旋流器内介质运移造成的影响，基于常规双切向入口式水力旋流器，以溢流分流比为可变参数，利用单因素试验设计，通过CFD-DEM模拟技术，开展不同工况下水力旋流器内部油砂两相介质的运移轨迹分析及研究。研究结果表明：分流比对砂相单颗粒和颗粒流的运移轨迹影响不大，但会造成砂相在旋流腔内停留时间的非线性增加；油相介质受溢流分流比的影响较大，随着分流比的增加，油滴粒子的分离效率从0%上升至100%，且运移轨迹向上延升。采用高速摄像系统进行实验研究，在不同分流比条件下，模拟结果和实验结果呈现较好的一致性。研究成果可对井下水力旋流器在除砂中的应用提供一定的理论支撑。

To clarify the impact of the split ratio on the medium migration within the hydrocyclone under sand-containing working conditions. Based on the conventional double-tangential inlet hydrocyclone and taking the overflow split ratio as the variable factor, the migration trajectories of oil-sand two-phase media in the hydrocyclone under different operating conditions were studied using the single factor test design and CFD-DEM simulation technic. The results show that the split ratio has little impact on the migration trajectories of single sand particle and particle flows, but it leads to a nonlinear increase in the residence time of the sand phase within the cyclone cavity. The oil phase media are significantly affected by the overflow split ratio. As the split ratio increase, the separation efficiency of oil particles rises from 0% to 100%, along with the upward extension of the migration trajectory. The experimental research was conducted using the high-speed camera system, revealed a good consistency between simulations and experimental results under different split ratio conditions. The research can provide theoretical support for the application of downhole hydrocyclone in sand removal.