Research on Particle-drilling Fluid Two-phase Flow Characteristics in a Deep-sea Slurry Lifting Pump

The behavior of solid-liquid two-phase flow in a deep-sea slurry lifting pump is crucial to the stability and efficiency of the offshore drilling system. In this work, a hydraulic geometry model of a two-stage slurry lifting pump was established. Solid-liquid two-phase flow characteristics under clear water and drilling fluid conditions were examined through numerical simulation using the computational fluid dynamics-discrete element method. The use of Pearson correlation analysis revealed a statistical link between particle passage time and particle forces. The performance of the slurry lifting pump was also evaluated experimentally, supporting the reliability of the numerical results. Findings show that under drilling fluid conditions, the flow field and particle forces display greater complexity, accompanied by a ۲.۰۵% increase in particle volume concentration and a ۰.۲۱ s extension in average particle passage time. Among all forces, the drag force exhibits the strongest association with passage time. Reducing particle drag force can improve the transportability of particles in the slurry lifting pump. These results provide practical insight for optimizing the anti-clogging performance of deep-sea slurry lifting pumps.

کلیدواژه ها:

">Deep-sea drilling ، ">Computational fluid dynamics-discrete element method (CFD-DEM) ، ">Solid-liquid two-phase flow ، ">Particle dynamics ، "> ، ">Pearson correlation analysis