Study on Flow Simulation and Efficiency Enhancement Methods for Downhole Jet Pump-Assisted Heavy Oil Lifting

The offshore heavy oil reservoirs have abundant reserves. To effectively extract these resources, jet pump lifting has been continuously applied and promoted. The jet pump is one of the widely used equipment in artificial lift, with a simple construction design and reliable operation. In order to design and optimize the distribution relationship between the power fluid of the jet pump and the lifting of heavy oil, and to achieve efficient production of the jet pump, this study takes the downhole jet pump as the research object, establishes the physical model of the oil production jet pump and conducts numerical simulation research using FLUENT fluid dynamics software, revealing the distribution law of temperature, pressure and flow fields and energy conversion characteristics in the jet pump under different power fluid displacement. The study found that, under the workings conditions of heavy oil wells, with the oil production remaining constant, as the power fluid displacement increasing from 110 m3/d to 140 m3/d, the negative pressure generation capacity of the pump increased, the suction capacity enhanced, and the efficiency of the jet pump improved. Based on the results of the numerical simulation study, a pump characteristic diagram was established and a design method for the jet pump in field application was proposed. The influence law of the combination of pump pressure and power fluid displacement was studied under the specific conditions of well X. The research results have certain guiding significance for the efficient extraction of heavy oil and have important engineering application value for improving the adaptability of the jet pump lifting system.