Simulation and Optimization of Downhole Pumps with Focus on IOR Application in Iranian Fields

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Rajaei, Mohammad Mahdi | 2019

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 55116 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Shad, Saeed
Abstract:
Three-dimensional (3D) computational fluid dynamics (CFD) was used in this study to investigate single and multi phase flow behavior related to three stages of ESP pump. Compared to experimental measurements, the numerical prediction for single phase flow of water is matched very well. Furthermore, the effects of viscosity and pump rotational speed for oil were investigated and the results show that by increasing oil viscosity and decreasing rotational speed, the pump head and efficiency reduced. ESP performance under two phase oil-methane flow and the effect of oil viscosity, rotational speed, intake pressure, gas bubble diameter, oil rate and gas volume fraction were studied. ESP boosting pressure and efficiency reduced by increasing gas bubble diameter and gas volume fraction due to gas accumulation in impellers. Increase in oil viscosity has a dual effect on ESP performance. At first, by increasing in oil viscosity, pump's efficiency and boosting pressure will increase. Then the effects are inverse. Also, impeller's rotational speed reduction, depending on inlet gas volume fraction, can increase or decrease the pump's efficiency
Keywords:
Gas-Liquid Flow ; Computational Fluid Dynamics (CFD) ; Electrical Submerible Pump (ESP) ; Single Phase Flow ; Efficiency Maximization

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