Drill-string dynamics coupled with the drilling fluid dynamics

T.G. Ritto (1, 2) , R. Sampaio (2) , Christian Soize (1)

1 MSME - Laboratoire de Modélisation et Simulation Multi Echelle
2 PUC Rio - Department of Mechanical Engineering

A drill-string is a slender structure that turns and drills into the rock in search of oil. A numerical model is developed using the Timoshenko beam theory and approximated by means of the Finite Element Method. The aim this work is to investigate the influence of the drilling fluid in the dynamics of the drill-string. So, a model for the fluid-structure interaction that takes into account the drilling fluid that flows downwards the column then goes upwards in the annulus is used. In addition, other efforts that the column is subjected to are considered: rotation at the top, hanging force at the top, bit-rock interaction, shock and rubbing between the column and the borehole, finite strains (what couples axial, torsional, and lateral vibrations) and the own weight of the column.

Mots clés: drill-string dynamics; nonlinear dynamics; fluid-structure interaction; bit-rock interaction; reduced order model; ROM

Domaines: Mécanique [physics.med-ph]; Probabilités [math.PR]; Vibrations [physics.class-ph]

T.G. Ritto, R. Sampaio, Christian Soize. Drill-string dynamics coupled with the drilling fluid dynamics. XIII International Symposium on Dynamic Problems of Mechanics (DINAME 2009), ABCM, Mar 2009, Angra dos Reis, RJ, Brazil. pp.1-10. ⟨hal-00691722⟩