Heat Flow Coupling Analysis Of Electric Submersible Centrifugal Pump Test Flow System

With the continuous development of oilfield development in our country,electric submersible oil centrifugal pump has gradually become an important kind of mechanical oil extraction equipment.The electric submersible centrifugal pump is widely used because of its large displacement,high head and good economic benefits.It is an important means to extract oil production and slow down the decline of old oil field.With the manufacture and application of electric submersible centrifugal pump,the previous electric submersible centrifugal pump performance detection system can not meet the detection requirements,a new detection system is needed to simulate the high head,high temperature,large displacement conditions.The performance test system of electric submersible centrifugal pump is used to measure the relationship between head,displacement,shaft power and efficiency.In order to simulate the actual working condition,a set of electric submersible centrifugal pump performance test flow system is designed in this paper.The system includes three functions: injection medium,circulating heating and main test flow.The injection medium process is to inject the normal temperature medium in the tank into the test well through the hot oil pump when the medium is insufficient in the test well.The circulating heating process is to carry out the circulating heating of the medium after the pipeline well is completely filled with the medium.The main test process is to test the performance of the electric submersible centrifugal pump under different working conditions.Because the whole test is conducted at a higher temperature,there will be a large amount of heat loss during the test.In order to reduce heat loss,insulation design and simulation calculation were carried out for test shaft,pipe and heater respectively.The three-dimensional models of wellbore,pipeline and heater were established,parameters such as fluid domain mesh,material and boundary conditions were set appropriately,and appropriate solvers were selected for numerical simulation.The heat transfer simulation calculation of the thermal insulation structure of the test shaft was carried out,and the advantages and disadvantages of using air thermal insulation and using thermal insulation materials were compared.Finally,the use of thermal insulation materials was selected.The thermal insulation structure design and simulation calculation of the ground pipeline are carried out,and the performance of the existing thermal insulation materials is analyzed comprehensively.In order to reduce the heat loss during the test,the two-layer thermal insulation structure is adopted.Design the thermal insulation structure and calculate the heat dissipation loss of the heater.A heating system is designed to calculate the heat required by the heating of thermal oil and steel in the test shaft system and the heat loss of the system.The heating power of the test system is calculated to ensure that the medium is heated to the highest temperature required within the specified time,and the heater and the hot oil circulating pump are selected to meet the power requirements of the test.A cooling system is designed to make the working temperature of the electric submersible centrifugal pump reach normal because of the large amount of heat generated by the pump itself.Determine the power of the cooler and select the cooling water pump.Based on the preliminary design of the test process,the related equipment is selected.Determine the volume of storage tank and compensation tank size,choose the flowmeter and regulating valve,design pipeline thermal elongation deformation compensation device.