For the problem of erosion-corrosion in oil pipeline system, used ANSYS FLUENT software, by changed the inlet velocity, the particle mass flow rate and the particle diameter, conducted numerical simulation for flow field distribution and severe erosion area of 90° elbow pipe. The results show that: with the increase of inlet velocity, the pipe erosion rate increases gradually; with the increase of particle diameter, the pipe erosion rate decreases; with the increase of particle mass flow rate, the pipe erosion rate increases linearly; and there have interaction between the three erosion factors of inlet velocity, particle mass flow rate and particle diameter.

      The ice blocking could happen during the process of conveying products oil in the pipeline, because of the low temperature in north China in winter. The pipeline occurred ice blocking, not only oil transport was affected but also unnecessary damage of production was caused, and the potential safety hazard could exist when it became serious. Based on thenumerical simulation software FLUENT, the flow field distribution was calculated around the single and multiple ice blocks in products pipeline which were in different height. The research results showed that increasing with the height of the ice wall, the pressure difference of front and back produced nonlinear changes, the pressure distribution regularities of multiple ice also produced nonlinear changes. In the aspect of velocity, the velocity variation degree of front and back the ice block was relatively stable, but the velocity change process around the ice block was more obviously and layered effect was better, the speed distribution regularities of multiple ice blocks were similar to that of the single ice blocks.