Study On The Influence Of Different Leaf Types On Electric Submersible Pump Performance And Internal Flow Field

In recent years,the exploration and development of shale reservoirs is extremely active,and the exploration and development of Daqing Gulong shale oil has made a major strategic breakthrough.Artificial lifting is one of the most effective exploitation methods in the optimized production of shale oil horizontal Wells.According to the current situation of Daqing shale oil exploitation,it is more appropriate to determine the rod-less lifting technology of electric submersible pump through the comparative analysis of the scheme.Due to the characteristics of high gas content and wide displacement range of shale oil,the traditional electric submersible pump cannot be fully applicable,and the pumped gas-liquid mixture has a small gas content,and the displacement condition range is limited.By changing the impeller leaf type,the gas content of the gas-liquid two-phase mixture can be effectively improved,and the displacement amplitude range can be fully improved.This paper selects the electric submersible pump as the research object,and takes the well condition of Guye Ping 1 as an example to explore the influence of different leaf types on the performance of the electric submersible pump and the internal flow field,and optimizes the response surface of the structural parameters of the electric submersible pump according to the characteristics of shale oil,so as to improve the head and efficiency of the electric submersible pump.(1)The research status of shale oil lifting technology,internal flow of electric submersible pump and gas-liquid two-phase flow is analyzed.According to the rheological state of shale oil reservoir,the best control equation,turbulence model,two-phase flow model and solution method are selected.(2)Through the analysis of patent and domestic and foreign literatures,the drainage leaf type,open leaf type and convex leaf type are selected,and then the geometric model and finite element model are established,and the single-phase flow steady-state simulation of the traditional leaf electric submersible pump is conducted,so as to compare the simulation results with the experimental results.(3)The simulation analysis of steady-state flow field and external characteristics of three types of electric submersible pump under different gas content and different flow conditions is conducted,and the changes of pressure,speed and gas phase volume distribution of impeller under different working conditions are studied,and the influence of gas content and flow conditions on the performance of electric submersible pump is analyzed.According to the analysis of the simulation results,the high gas content,the higher the small flow,the more severe the performance decline;under the same gas content condition,the leaf type is another important factor affecting the stable operation of the electric submersible pump;the open seam leaf type is more suitable for small flow and high gas content;the flange leaf type is suitable for large flow workers and the gas content is greater;the drainage leaf type has a wider flow range,and the gas is less in line with the characteristics of shale oil.(4)According to the current situation of shale oil reservoir and the simulation analysis results of electric submersible pump impeller,the drainage leaf type is selected to optimize the blade parameter response surface.After optimization processing,the optimal parameter combination is obtained and simulated.Under the design condition,the efficiency and head increased by 7.96% and 12.46% respectively,which improved the performance of the electric submersible pump.This paper explores the idea for the engineering application of electric submersible pump,provides a reference for the practical operation,and has certain practical significance.