Structural Optimization Design And Flow Field Analysis Of Gas-Liquid Separator In Pumping Well

In the process of oil production,the liquid to be lifted in the wellbore often contains a lot of associated gas,which reduces the pump efficiency and shortens the service life of the lift pump.In serious cases,the lift pump produces "air lock" phenomenon,it is impossible to complete the lifting process.In view of this phenomenon,this paper carries out the research on the gas-liquid separator in the well of pumping unit and optimizes the structure of the separator accordingly.At the same time,the separation performance of the new optimized separator was studied under different operating parameters.This study is of great significance for prolonging the service life of the pump,improving pump efficiency and saving oil production cost.Firstly,the effects of different gas content on oil-water separation were studied.The effects of different gas content on the separation performance of oil-water cyclone were studied by using computational fluid dynamics software FLUENT and computational fluid dynamics analysis method;Secondly,by analyzing the influence of different gas content on the internal velocity field,concentration field and separation performance of the cyclone,the oil-water two-phase separation performance of the cyclone varies with different gas content;Then,for the liquid extraction work after oil water separation and gas-bearing conditions,a new type of gas-liquid separator suitable for pumping well is proposed,and the response surface design method is used to optimize the structural parameters of the gas-liquid separator;Finally,the optimized gas-liquid separator can ensure the efficient separation of gas-liquid two phases under different well conditions,thereby reducing the negative influence of gas on the pumping structure.The analysis of the gas-liquid separator after structural optimization was carried out,and the influence of the separation effect of the separator under a certain inlet pressure was explored when the liquid inlet amount and the number of gas integration changes within a certain range,and the applicability of the separator in this range was obtained.The results show that when the pressure is constant,the separation efficiency of the gas-liquid separator is within a certain range,which gradually increases with the increase of liquid intake,and shows a trend of first increasing and then decreasing with the increase of the gas integration number;At the same time,a gas-liquid separator experiment system was set up in the room.Experiments were carried out on the new gas-liquid separator under a certain inlet pressure,different liquid intake and gas-containing integral number within a certain range,and experimental data were collected and compared with the separation effect of the separator under numerical simulation parameters.The results show that the new separator described in this paper can meet most application conditions.