Friction-induced torsional vibrations in an experimental drill-string system

In this paper, we aim for an improved understanding of the causes for torsional vibrations in rotary drilling systems that are used for the exploration of oil and gas. For this purpose, an experimental drill-string set-up is considered. In that system, torsional vibrations with and without stickslip are observed in steady-state. In order to obtain a predictive model, a discontinuous static friction model is used. The parameters of the suggested model are estimated and the steady-state behaviour of the drill-string system is analysed both numerically and experimentally. A comparison of numerical and experimental bifurcation diagrams indicates the predictive quality of the model. Moreover, specific friction model characteristics can be linked to the existence of torsional vibrations with and without stick-slip.

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