Structural Optimization Of Single-stage Axial Inlet Oil-water Cyclone Separator

As the key component of downhole oil-water pre-separation device,axial inlet oilwater cyclone plays an important role in the same well production and injection technology because its radial structure size is suitable for the space of slender tubular string.Firstly,the research progress of hydrocyclone is summarized in this paper,including the side wall cavity structure,guide vane structure,computer numerical simulation technology and structural optimization research methods.The application prospect of axial flow guide vane cyclone separation technology was analyzed.Aiming at the operating parameters of the mixed liquid to be separated,combined with the existing structure of hydrocyclone,an axial flow guide vane hydrocyclone with axial inlet,middle through cone and variable pitch helical guide vane was designed,and its separation mechanism was analyzed,and its three-dimensional modeling was carried out by using UG.The separation effect of initial design model of axial flow guide vane hydrocyclone was analyzed by numerical simulation method.The fluid dynamics software Fluent was used to simulate the oil-water two-phase volume fraction,velocity and pressure drop distribution.The simulation results show that a cylindrical oil core is formed at the axis of the axial flow guide vane hydrocyclone.The separation efficiency E = 59.8%,and the pressure loss is about 0.18 MPa.?According to the five key structures of the initial design model of the axial flow guide vane hydrocyclone,five parameters to be optimized are set up.Three-dimensional modeling and numerical simulation are carried out one by one.The separation efficiency and pressure drop of the hydrocyclone under different optimization parameters are compared and analyzed,and the optimum structural parameters of separation efficiency and pressure drop are determined.The separation efficiency was increased from 59.8% to 75.9%,and the pressure drop was reduced from 0.18 MPa to 0.16 MPa.