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The effect of dynamical parameters on precession in rotary drilling

Abstract : Precession, which is the rolling motion of the drillstring on the walls of the borehole, is investigated by considering the various possible motions of a rotating disk in a circular hole. Due to the simplicity of the model, closed-form results are derived on the stability of precession and on the evolution of impacting motions towards precession. It is found that increasing coefficients of friction and contact damping have a favoring effect on precession, while the stiffness and damping of the drillstring bending mode have an opposing effect.
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https://hal-polytechnique.archives-ouvertes.fr/hal-01025352
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Submitted on : Thursday, July 17, 2014 - 5:08:50 PM
Last modification on : Thursday, March 5, 2020 - 6:29:28 PM

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A. Théron, Emmanuel de Langre, C. Putot. The effect of dynamical parameters on precession in rotary drilling. Journal of Energy Resources Technology, 2001, 123 (3), pp.181-186. ⟨10.1115/1.1383974⟩. ⟨hal-01025352⟩

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