Simulation And Experimental Study On Axial Flow Guide Vane Oil-Gas Separator

Because of its compact structure,high separation efficiency,low cost and adaptability to gas and liquid flow volume,axial flow guide vane gas-liquid separator has a wide application prospect in various oilfields.However,due to insufficient theoretical research and imperfect design methods,the engineering application of this separator is greatly limited.By theoretical analysis,numerical simulation and experimental verification,this paper analyzes the flow field characteristics of axial flow guide vane gas-liquid separator,thus improving the separation performance of the separator and developing and perfecting the design method of axial flow guide vane gas-liquid separator.The main results and conclusions are as follows:(1)In this paper,the basic theory,structural optimization and design application of axial flow guide vane gas-liquid separator are summarized.Based on the principle of gas-liquid two-phase separation,the force and motion of liquid droplets in the swirling flow field are analyzed.Combined with the principle of each structure of the separator,the preliminary design method of axial flow guide vane gas-liquid separator is further improved.This provides theoretical guidance and reference for the design and application of axial flow guide vane gas-liquid separator.(2)In this paper,Fluent numerical simulation software was used to study the influence of guide vane structural parameters and outer cylinder structural parameters on the separation performance of axial flow guide vane gas-liquid separator.The optimal guide vane structure parameter established is a 45 ° circular arc blade.The optimal structural parameters of the outer cylinder are the height ratio of the inner and outer cylinders ranging from 2.2 to 2.7,and the diameter ratio of the inner and outer cylinders ranging from 3.2 to 4.2.(3)Based on the optimized structure of the axial flow guide vane gas-liquid separator,the influence of flow parameters on the separation performance of the axial flow guide vane gas-liquid separator was studied.Under normal pressure,as the gas-liquid ratio increases,the separation efficiency of the separator first increases and then decreases.When the gas-liquid ratio is 3.75,the optimal separation efficiency is achieved.The increase in inlet gas content will first increase and then decrease the comprehensive separation efficiency of the separator.The optimal inlet gas content is 0.4.(4)The operating pressure has little effect on the separator separation performance.At low inlet flow rates,the separation efficiency of the separator decreases with increasing viscosity.However,at higher inlet flow rates,the separation efficiency of the separator decreases first and then increases with increasing viscosity.(5)A circular pipeline experimental system was designed for performance testing of axial flow guide vane gas-liquid separator.Under different conditions of gas and liquid velocities,liquid viscosity,and height ratio of inner and outer cylinders,the variation of separation performance of the separator was studied.The experimental results verified the accuracy of the preliminary design method for the separator and the rationality of the numerical simulation method.