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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)


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.


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