Analysis of fluid-structure coupling vibration mechanism for subsea tree pipelinecombined with fluent and ansys workbench

Abstract

In the process of oil exploitation, subseatrees sometimes vibrate. In this paper, fluid- structure coupling software was used to study the causes of subsea tree vibration. First, the complex subsea tree model wassimplified, and ageometric grid model wasestablished for software calculation. Then, under the given two working conditions, the software Fluent wasused to analyze the pressure and velocity distribution of the subsea tree pipeline’s flow field. It was found that the pressure of the flow field changed greatly at the variable diameter and right-angles. Using Ansys Workbench software, flow-structure coupling calculations and modal analysis of the subsea tree werecarried out. The results showed that the vibration of the long straight pipeline section wassevere. Finally, the paper puts forward the measures to reduce the vibration of subsea tree pipelines and provides construction advice for the safe production of subsea trees.