Numerical Simulation Of Erosion Wear Of Typical Pipes In Gathering Pipeline

In the petrochemical industry,when pipelines are used to transport oil and natural gas,the fluids in pipelines are not single-phase fluids.Especially in the gathering and transmission pipelines,the fluids produced in oil and gas wells are accompanied by traces of solid particles in addition to the main phase fluids of oil and gas.This causes serious erosion problems at typical pipe fittings in the gathering pipeline.The corrosion erosion problem has a complex mechanism,so it is great significance to study the erosion corrosion problems of typical pipe fittings in a gathering pipeline.For the erosion and corrosion problems in the gathering and transmission pipelines,numerical simulations using FLUENT 15.0 were explored.Several typical pipe fittings that are in line with the actual working conditions are established and the numerical calculation of the effects of liquid-solid two-phase flow on erosion corrosion behavior is performed.Perform flow field analysis on typical pipe fittings,and explore the effects of parameters such as fluid velocity,particle diameter,fluid viscosity,fluid density,and particle size on the erosion behavior of typical pipe fittings;in addition,compare the length of the plug position at the blind pipe.Corrosion behavior was affected,and a new type of curved pipe structure was proposed to analyze the erosion wear behavior at the elbow in natural gas gathering pipelines.The erosion wear behaviors at wear elbows and classical elbows under the same boundary conditions were investigated,and explore its anti-wear performance.The results show that the velocity of the main phase fluid in the oil-gas gathering and transmission pipeline has a great influence on the erosive wear behavior at the blind pass structure and at different bend pipe structures.With the increase of the main phase fluid velocity,blind pass and the maximum erosion wear rate at different bend structure increases,and the area where scour corrosion behavior occurs also varies greatly.The particle size of solid particles also has a great influence on the erosion wear behavior.As the particle size of the solid particles increases,the erosion wear behavior at the blind pass structure in the crude oil gathering and transportation pipeline is weakened;however,in the natural gas gathering pipeline,Erosion wear occurs at the elbow.As the viscosity of the fluid increases,the maximum erosion rate at the blind pass structure decreases,and the erosion wear area does not change significantly.The mass flow of the particles has a great influence on the wear rate of the blind pass structure and the erosion of the two different structures.With the increase of the particle size,the wear rate of the blind pass structure and the position of the different structural bends.Both are exacerbated and the erosion wear area expands.The numerical investigation of a blind-passage structure with a diameter of 50 mm has been carried out.When the plug length is 45 mm,the blind pass structure has the best anti-erosion effect.Comparing the erosion wear behavior of the classic elbow and the curved pipe structure equipped with a wear shield,it can be seen that the anti-abrasion structure of the elbow pipe with the anti-wear shield is better.