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Fluid-structure interaction analysis on the dynamic response of a rotating drill string under wave action
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Fluid-structure interaction analysis on the dynamic response of a rotating drill string under wave action
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Journal Article
Fluid-structure interaction analysis on the dynamic response of a rotating drill string under wave action
2025
Overview
Deepwater drilling involves the use of a drill string that is slender and relatively large, making it a critical weak link in offshore drilling systems. Dynamic coupling within the drill string becomes more complex under the combined effects of ocean currents and synchronized rotation. Therefore, this study uses a Fluid-Structure Interaction (FSI) model to explore the dynamic characteristics of the rotating drill string. The model is primarily based on solutions of Navier-Stokes equations and structural mechanics control equations, with the interaction force between the fluid and structure coupled through boundary conditions to ensure force balance between the two. The results show that the larger the wave period is, the greater the maximum displacement magnitude of the drill string is. At a wave height of 0.1 m and a drill string rotational speed of 200 r/min, the maximum average displacement magnitude of the drill string monitoring position occurs when the wave period is 3 s. Additionally, under different wave periods, the displacement trajectory of the drill string over time shows periodic variations, with larger displacements occurring closer to the lower end of the drill string. The findings provide support for the structural design of open-hole coring drill strings and drilling plans.
Publisher
IOP Publishing
