Research On Erosion Mechanism Of Hydrocyclone By Liquid-solid Two-phase Flow

With the injection-production technology for the same well in oilfield,there is a large amount of sediment in the oilfield production fluid.As the fluid carring sand into the downhole cyclone separator during the separation process,the wall of the cyclone not only bears the erosion of the fluid carrying solid impurities,but also bears the corrosion of the corrosive medium in the fluid.The two sides promote each other,while reducing the life of the hydrocyclone,resulting in changes in the size of the hydrocyclone,thereby reducing the separation efficiency of the cyclone separator.1Cr18Ni9 Ti and 35 CrMo materials are widely used in downhole cyclone separators because of their excellent mechanical properties.The erosion behavior of two kinds of materials in the liquid-solid two-phase flow environment is studied,which has practical significance for optimizing the parameters of the downhole hydrocyclone and delaying the failure of the cyclone.In this paper,based on the two-phase flow model,the numerical simulation of the wear of the inner wall of the cyclone was carried out to analyze the wear characteristics of the inner wall.The single-particle erosion model was established by using ANSYS LS-DYNA to study the erosion mechanism of the target under different erosion angles.Using jet erosion test-bed,the commonly used two kinds of materials for downhole hydrocyclone 35 CrMo,1Cr18Ni9Ti,using 3.5wt% NaCl solution mixed quartz sand,distilled water mixed quartz sand as the experimental medium,the effects of four factors,flow velocity,erosion time,sand content and erosion angle on the erosion law of two kinds of materials,were studied for 1Cr18Ni9 Ti and35CrMo.At the same time,the regularity of the erosion and interaction of the two materials was studied,and the erosion mechanism of the two kinds of materials was analyzed by sem.