Indoor Experiment and Simulation Research on Long Column Plug Air Pumps
In China's mid to late stages of oilfield development,the issue of lifting high gas-liquid ratio oil wells has become increasingly prominent.To address this,the long plug gas pump was designed with an exhaust structure outside the original pump barrel.This allows the gas entering the pump to return to the annulus,achieving the goal of improving pump efficiency.However,the applicability of long column plug gas pumps remains unknown due to a lack of cost-effective evaluation methods.To address this issue,we adopted the CFD method and introduced dynamic grid technology.We established a numerical model of gas-liquid transient flow and pump valve motion law in the long column plug anti gas pump barrel based on control equations and wave equations.The purpose of the indoor visualization experiments was to verify the accuracy of es-tablishing numerical models.The average model error was found to be 5.84％.A numerical mod-el was used to simulate and analyze the gas-liquid two-phase flow pattern inside the upper and lower stroke pump barrel of a long column plug gas pump.The impact of stroke and stroke on pump efficiency was also analyzed.The applicable gas-liquid ratio range was determined.When the gas-liquid ratio exceeds 400 m3/m3,the pump efficiency of the long column plug gas pump decreases below the economic pump efficiency.
high gas-liquid ratioanti air pumpvisualization experimentsCFDpump efficiency
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NSTL
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