In response to the serious erosion and wear damage caused by solid particles carried in fracturing fluid to pipelines and the failure of pipe fittings,ANSYS Fluent software was used to numerically simulate the erosion and wear of pipelines under different fluid and structural parameters,and the optimal nonlinear curve fitting equation for inlet flow rate,particle diameter,mass flow rate,viscosity,and the maximum erosion rate of spatial pipelines with the elbow diameter was obtained.It is found that the relationship between the flow velocity,particle diameter and viscosity is a quadratic function with the maximum erosion rate,respectively.The relationship between the mass flow rate and the diameter of the elbow is powered functions with the maximum erosion rate,respectively.The comprehensive influence of various parameters on the maximum erosion rate was studied by orthogonal test,and SPASS software was used to perform multiple nonlinear regression analysis on the fitting equation,a predictive model for erosion wear was obtained.The results indicate that the obtained nonlinear regression equation has a high degree of fitting and can well reflect the influence of various factors on the maximum erosion rate of spatial pipelines.