Research On Wide Runner Impeller And Guide Vane Of Submersible Electric Pump(ESP)and Analysis Of Heavy Oil Conveying Capacity

Electric submersible pump(ESP)is an important equipment in oil field production,the core part of which is a multistage centrifugal pump used for lifting fluid.Centrifugal pump factory is to use water as the test medium,when applied to the viscosity of heavy oil,the huge difference in the viscosity of the two is bound to lead to the submersible pump work efficiency is not ideal or even can not work normally.In order to ensure its efficient,safe,stable and reasonable operation,this paper takes Q10 submersible electric pump as the prototype pump.The flow path of the regulating wheel in the middle of the centrifugal pump is reasonably widened so that the pump is more suitable for lifting high viscosity heavy oil.In this paper,ANSYS CFX is used to simulate the prototype pump firstly,and the results of external characteristics obtained by simulation are compared with the existing experimental data.Except for the error of some small flow conditions,the other results are more accurate,which verifies the reliability of the numerical simulation.Then,the flow path of the vane guide wheel of the prototype pump is widened successively,and compared with the prototype pump,the impeller with better performance is selected,which is called QP20.QP20 was pumped from medium with different viscosities under variable flow conditions,and its adaptability to heavy oils with different viscosities was studied by analyzing external characteristics and internal flow field velocity vector distribution,streamline distribution and static pressure distribution.Combined with variable speed conditions,external characteristics and internal flow field analysis,so as to study the effects of viscosity,flow and speed on pump performance and internal flow state.The results of the study on the external characteristics and internal flow field of submersible electric pump show that the head and efficiency decrease with the increase of viscosity under the same flow condition.Under the same viscosity,the hydraulic loss in the pump increases with the increase of flow,and the head decreases.Reflected in the internal flow field is the impact on the leading edge of the blade.Pump head and efficiency increase with the increase of speed,but there is a peak efficiency,consistent with the law of proportionality.Under the optimal flow condition,the performance of impeller swabbing heavy oil is good and the distribution of internal flow field is more uniform.In the case of variable speed,the internal flow field has obvious difference,indicating that the energy obtained by the fluid is different.To sum up,the large viscous force of the high viscosity fluid greatly affects the internal flow field of the pump and is not conducive to the efficient operation of the pump.QP20 can be well applied to lift the high viscosity produced fluid.The above research results provide a new idea for lifting high viscosity produced liquid,and provide theoretical support and certain guiding significance for practical production.