Effect Of The Structure Of The Super-high Pressure Sand Remover Cyclone On The Performance Of Sand Removal

The output of ultra-high pressure oil and gas wells carries a large amount of liquid and mud and sand,which not only affects the oil and gas transportation but also causes erosion and wear on the connected equipment.It takes a lot of manpower and material resources for prevention and research every year.In order to solve this kind of problem,this paper designed a double-cone sand remover capable of three-phase gas-liquid-solid separation.Using the multiphase flow separation theory as a guide,the flow field characteristics of the separator were studied using CFD numerical simulation software FLUENT,Analyze the factors that affect its separation performance.The main research contents and conclusions are as follows:?1?This article first compares three types of three-phase cyclone separators,and selects a model of cyclone separator suitable for ultra-high pressure conditions.Then use SolidWorks software to establish the initial model,Mesh software for mesh division and Fluent software numerical simulation.?2?The Mxiture model was used to analyze the distribution law of gas-liquid flow field,and the main physical quantities of the flow field under ultrahigh pressure and normal pressure were compared.It was found that under ultra-high pressure conditions,the fluid acceleration in the cyclone separator is more obvious,and the static pressure gradient is greater,which is conducive to separation.?3?On the basis of gas-liquid two-phase simulation,DPM model is added to simulate gas-liquid-solid three-phase flow field.The movement trajectories of single particles and particle groups are analyzed,and it is found that the movement trajectories of droplets with different particle sizes and different incident positions are different,and short-circuit flow and back-mixing occur in the initial model,which are not conducive to separation efficiency.The separator is optimized.?4?Analyze and compare the flow field distribution of the five kinds of cyclone structure desander,and find that the taper of the cyclone of the same height has a significant effect on the separation performance,and choose the optimal cyclone size.On this basis,the influence of the swirl chamber diameter on the separation efficiency is studied.?5?Using the optimized model,use the single factor method to analyze the influence of different operating parameters?inlet flow rate,particle size and inlet pressure?and physical parameters(gas-liquid volume ratio R_gll and liquid sand volume ratio R_ls)on the separation performance And get the best value range.The work carried out in this paper provides a theoretical basis and reference for further research on the separation mechanism,separation characteristics and structural optimization design of the three-phase cyclone separator under ultra-high pressure conditions,and provides a useful reference for the on-site sand removal process.