Observer based output-feedback control to eliminate rorsional drill-string vibrations

T.G.M. Vromen, N. van de Wouw, A. Doris, P. Astrid, H. Nijmeijer

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Torsional stick-slip vibrations decrease the performance and reliability of drilling systems used for the exploration of energy and mineral resources. In this work, we present the design of a nonlinear observer-based outputfeedback control strategy to eliminate these vibrations. We apply the controller to a drill-string model based on a real-life rig. To facilitate the design and implementation of the controller, we employ model reduction to obtain a low-order approximation of this model. Conditions, guaranteeing asymptotic stability of the desired equilibrium, corresponding to nominal drilling operation, are presented. The proposed control strategy has a significant advantage over existing vibration control systems in current drilling rigs as it only requires surface measurements instead of expensive down-hole measurements and can handle multiple modes of torsional vibration. Case study results using the proposed control strategy show that stick-slip oscillations can indeed be eliminated in realistic drilling scenarios.
Original languageEnglish
Title of host publicationProceedings of the 53rd IEEE Conference on Decision and Control, 15-17 December 2014, Los Angeles, California, USA
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
ISBN (Electronic)978-1-4673-6088-3
Publication statusPublished - 2014
Event53rd IEEE Conference on Decision and Control, CDC 2014 - "J.W. Marriott Hotel", Los Angeles, United States
Duration: 15 Dec 201417 Dec 2014
Conference number: 53


Conference53rd IEEE Conference on Decision and Control, CDC 2014
Abbreviated titleCDC
Country/TerritoryUnited States
CityLos Angeles
Internet address


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