Abstract
Torsional stick-slip vibrations decrease the performance, reliability and fail-safety of drilling systems used for the exploration and harvesting of oil, gas, minerals and geo-thermal energy. Current industrial controllers regularly fail to eliminate stick-slip vibrations, especially when multiple torsional flexibility modes in the drill-string dynamics play a role in the onset of stick-slip vibrations. This chapter presents the experimental validation of novel robust output-feedback controllers designed to eliminate stick-slip vibrations in the presence of multiple dominant torsional flexibility modes. For this purpose, a representative experimental test setup is designed, using a model of a real-life drilling rig as a basis. The model of the dynamics of the experimental setup can be cast in Lur’e-type form with set-valued nonlinearities representing an (uncertain) model for the complex bit-rock interaction and the interaction between the drill-string and the borehole. The proposed controller design strategy is based on skewed-\(\mu \)-DK-iteration and aims at optimizing the robustness with respect to uncertainty in the non-smooth bit-rock interaction. Moreover, a closed-loop stability analysis for the non-smooth drill-string model is provided. Experimental results confirm that stick-slip vibrations are indeed eliminated using the designed controller in realistic drilling scenarios in which state-of-practice controllers have failed to achieve the same.
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Notes
- 1.
\({\mathscr {H}_\infty }\) is a (closed) Banach space of matrix-valued functions that are analytic in the open right-half plane and bounded on the imaginary axis. The real rational subspace of \({\mathscr {H}_\infty }\) is denoted by \(\mathscr {R}{\mathscr {H}_\infty }\), which consists of all proper and real rational stable transfer matrices [41, Sect. 4.3].
- 2.
Note that due to scaling, this corresponds to 35 rpm on a real drilling rig.
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van de Wouw, N., Vromen, T., van Helmond, M.J.M., Astrid, P., Doris, A., Nijmeijer, H. (2018). Experimental Validation of Torsional Controllers for Drilling Systems. In: Leine, R., Acary, V., Brüls, O. (eds) Advanced Topics in Nonsmooth Dynamics. Springer, Cham. https://doi.org/10.1007/978-3-319-75972-2_8
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