Numerical Simulation on Drilling Fluid Flow and Gas-Liquid Separation of Negative Pressure Shale Shaker
Negative pressure shale shaker is a new type of solid-liquid separation equipment,and it exhibits excellent drying while drilling effect on drilling cuttings.However,there has been no in-depth research on the bas-ic theoretical aspects such as the drilling fluid flow law of the equipment and the gas-liquid separation mechanism and efficiency after the air and drilling fluid have passed through the screen.In this paper,the computational fluid dynamics(CFD)method was used to build a 3D transient two-phase flow screening simulation model of negative pressure shale shaker.Then,the Euler-Euler multiphase flow model(VOF)and porous media model were used to systematically study the flow pattern of drilling fluid on the screen and the pressure distribution characteristics below the screen under the action of negative pressure,and explore the influence of negative pressure on the treatment ca-pacity of shale shaker,drilling fluid sieving speed and gas-liquid separation efficiency.The results show that under the same shaking conditions,the sieving speed of the negative pressure shale shaker is increased by 87%,and the treatment capacity is increased by 18%.When the negative pressure is-10 kPa,the separation efficiency reaches 95.8%.As the negative pressure increases,the gas-liquid separation efficiency decreases.As the height of the gas exhaust duct increases,the gas-liquid separation efficiency increases.The conclusions provide theoretical guidance for the development and application of negative pressure shale shakers.
negative pressure shale shakerdrilling fluid flowgas-liquid separationCFDVOFporous media
万方数据
维普
