Numerical Calculation of Erosion-corrosion for Bend of Gathering Pipelines in Gas Condensate Field

The media’s flow pattern and composition of gathering pipelines in gas condensate field are much complex. So erosion-corrosion often happened and led to accidents. In response to this phenomenon, computational fluid dynamics is introduced to study the erosion-corrosion of the bend. Mathematical model of erosion-corrosion is established based on the laws of fluid flow. According to operational parameters of gathering pipelines, fluid’s flow was simulated in three kinds of operating mode. Results showed that the region of the maximum shear stress and containing liquid rate truly existed in the pipeline. The greater the velocity of gas phase, the more serious the erosion-corrosion. when the structure of pipe was changed, the flow velocity and turbulence intensity as well as other parameters of media within pipe were changed too. The study results not only can provide guidance to study how fluid dynamics factors influence the erosion-corrosion of pipelines, but also can be used to guide the corrosion detection of actual pipelines and the structure optimization for reducing accidents.