Fluid-solid Coupling Analysis And Erosion Wear Research Of High Temperature Electric Submersible Pump Impeller

Electric submersible pumps are widely used in deep sea or in some oil wells that are difficult to collect.As the key oil production equipment of gravity oil drainage technology,it will be eroded and worn by solid particles in crude oil during its operation,causing irreversible damage to the impeller of the high-temperature submersible electric pump,which seriously affects the exploitation speed of the oilfield.In this thesis,the erosion wear and fluid-structure interaction of the two-stage impeller are studied.The high temperature electric submersible pump entity was modeled after the manufacturer’s drawings,and a three-dimensional fluid-region model of the two-stage electric submersible pump at high temperature was created.Once meshed,the Fluent software package was used to calculate the internal and external characteristics of the full fluid region of the submersible electric pump at high temperature under different operating conditions.Use the manufacturer’s test platform to obtain data on the external characteristic parameters of the high temperature electric submersible pump.The comparison between the experimental results and the numerical calculation results confirms that the experimental results were basically consistent with the numerical calculation results within the allowable error range.The impeller body of the two-stage high-temperature electric submersible pump was introduced into the static analysis model and meshed.On the basis of the numerical simulation of the internal flow field,the solid-liquid two-phase turbulence model was established,and the fluid pressure in the numerical calculation result of solid-liquid two-phase fluid was loaded onto the solid surface of the impeller as a load using the Euler-Lagrange calculation method.The equivalent force and total deformation of the impeller were obtained by static analysis,the influence of the equivalent force and total deformation of the two-stage impeller under different working conditions was explored.On the basis of solid-liquid two-phase turbulence model,the erosion wear model was established,and the erosion wear of the impeller of the two-stage high-temperature electric submersible pump was numerically simulated.Six influencing factors of impeller speed,inlet flow,particle size,particle density,particle volume fraction and particle mass flow rate were numerically calculated,and the influence of different influencing factors on the erosion wear of the two-stage impeller and the main parts of erosion wear were analyzed.On the basis of structural static analysis,the influence of impeller deformation on erosion wear under different working conditions was discussed,and the impact of fluid-structure interaction on erosion wear under different working conditions was determined by comparing and analyzing the erosion results without deformation.The above methods,such as computational fluid dynamics theory,fluid solid coupling theory,numerical simulation,and experimental verification,were used to explore the stress concentration,total deformation,erosion wear,and other states of two-stage impellers.Confirm the distribution of impeller pressure and speed.Confirm the distribution of pressure,velocity and stress of the impeller;The erosion wear analysis shows that the influence of the volume fraction and mass flow rate of particles is the largest,and the two-stage impeller has serious wear at the blade inlet,blade concave outlet and upper cover plate,and the inlet part of the secondary impeller is seriously worn,and the influence of micro deformation on the erosion wear is small.It is of great significance to reduce production costs,improve the working efficiency of electric submersible pumps,and improve the overall performance.