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Design of a Controller for Suppressing the Stick-slip Oscillations in Oil well Drillstring

Author Affiliations

  • 1Department of Electrical and Computer Engineering, Semnan University, IRAN

Res. J. Recent Sci., Volume 2, Issue (6), Pages 78-82, June,2 (2013)

Abstract

In oil well drilling operations, one of the important problems to deal with is represented by the necessity of suppressing harmful stick-slip self-excited oscillations. This oscillation is a source of failures which reduce rate of penetration (ROP) and increase drilling operation costs. Stick-slip leads to excessive bit wear, premature tool failures and a poor rate of penetration. In this paper we propose to use the weight on the bit (WoB) force as an additional control variable to compensate stick-slip oscillations. We use changes of torque applied to drillstring for adaptation of oB. Torque and WoBare both measurable and bit speed and bit torque is not necessary. Simulations applying this method show that the stick-slip oscillations can be eliminated without requiring a re-design of the velocity rotary-table control.

References

  1. Morten Krotoy Johannessen Torgeir Myrvold, Stickprevention of drill strings using nonlinear model reduction and nonlinear model predictive control, Thesis of master of science of Norwegian University of Science and Technology Department of Engineering Cybernetics, MAY (2010)
  2. A.F.A. Serrarens, M.J.G. van de Molengraft, J.J. Kok and L. van den Steen, H-infinity control for suppressing stickslip in oil-well drillstrings, IEEE Control Systems(1998)
  3. E.M. Navarro-L´opez and R. Su´arezapproach to modeling and controlling stickin oil-well drillstrings, in IEEE International Conference on Control Applications Taipei, Taiwan, 1454-1460(2004)
  4. Carlos Canudas-de-Wit, Francisco R. Rubio, "Dnew mechanism for controlling stickwell drillstrings." IEEE Transactions on control systems technology, 16(6), (2008)
  5. Corchero M.A., Canudas-de-Stability of the D-OSKIL oscillation suppression mechanism for oil well drillstrings45th IEEE Conference on Decision and ControlDiego, California, 13-15 December (2006)
  6. E.M. Navarro-L´opez and D. Cort´es, Avoiding harmful oscillations in a drillstring through dynamical analysis, accepted in Journal of Sound and Vibration (2006)
  7. Marcos Silveira and Marian Wiercigroch, Low dimensional models for stick-slip vibration of drillInternational Conference on Modern Practice in Stress and Vibration Analysis, Journal of Physics181 (2009)