Optimization of Impeller Structure for Electric Submersible Pumps in Sanding Oil Wells
The electric submersible pump(ESP)is used in oil well sanding,and the impeller of the centrifugal pump will be severely worn by sand particles,resulting in a decrease in suction performance and even pump failure.In order to clarify the wear pattern of the impeller and optimize the structural parameters of the impeller,a simulation analysis of the wear characteristics of the impeller under sand conditions was carried out.A full-scale geometric model of the centrifugal pump was established,in which a hexahedral structured mesh was used for the grid,CFD technology was used for the numerical simulation,RNG k-ε turbulence model and discrete phase model were used for the simulation of the solid-liquid two-phase flow field,erosion wear rate was selected as the evaluation index,and SIMPLEC algorithm was used for the calculation.The orthogonal design method was adopted in the experiment to address the interactive effects of multi-factor sensitivity analysis.The experimental results show that the outlet width has the greatest effect on the wear of the impeller,while the effects of the blade inclusion angle,inlet width and number of blades are reduced accordingly.The larger the outlet width of the impeller,the lower the erosion wear rate.The optimum structural parameters for impeller outlet width,blade inclusion angle,number of blades and inlet width are 21.1 mm,90°,10 and 13.6 mm,respectively.Compared with the original impeller structure of the pump type,the geometry of the new impeller is more divergent.The research results provide a qualitative basis for the selection of pump types for similar oil wells,and also provide theoretical support for the optimization of sand resistance performance in the field of ESP manufacturing.
electric submersible pumperosive wearnumerical simulationstructural optimization
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