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Stick-Slip and Whirl Motions of Drill Strings: Numerical and Experimental Studies

[+] Author Affiliations
Nicholas Vlajic, Chien-Min Liao, Balakumar Balachandran

University of Maryland at College Park, College Park, MD

Hamad Karki

The Petroleum Institute, Abu Dhabi, UAE

Paper No. DETC2011-47949, pp. 829-838; 10 pages
doi:10.1115/DETC2011-47949
From:
  • ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 4: 8th International Conference on Multibody Systems, Nonlinear Dynamics, and Control, Parts A and B
  • Washington, DC, USA, August 28–31, 2011
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5481-5
  • Copyright © 2011 by ASME

abstract

The dynamics of drill strings, which are long structures used in drilling operations, are explored numerically and experimentally within this article. A reduced-order distributed parameter model that allows for coupled bending and torsional motions is presented along with forces that take into account interactions between the drill string and the wellbore. Further, a scaled experimental apparatus is presented along with results. Both experimental results and model predictions show backward whirling. Stick-slip interactions are investigated numerically, and the simulation results are seen to be in good agreement with experimental observations. These results could prove useful when designing control schemes for mitigating undesirable torsional and bending motions.

Copyright © 2011 by ASME

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