Failure of oilwell drillstrings is very costly in terms of money and time. There are many reasons for drillstring failure, such as vibration, fatigue, and buckling. Stick-slip vibration has received considerable attention in recent years with increasing use of polycrystalline diamond compact (PDC) bits in harder formations, and has motivated extensive research on this type of drillstring vibration. This paper addresses the advantages of a linear quadratic regulator (LQR) controller, compared to a spring-damper isolator, for stick-slip and bit-bounce mitigation in an oilwell drillstring. A bond graph model of a drillstring has been used for simulation that predicts axial vibration, torsional vibration, and coupling between axial and torsional vibration due to bit-rock interaction.
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ASME 2012 International Mechanical Engineering Congress and Exposition
November 9–15, 2012
Houston, Texas, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-4520-2
PROCEEDINGS PAPER
Advantages of an LQR Controller for Stick-Slip and Bit-Bounce Mitigation in an Oilwell Drillstring
Md. Mejbahul Sarker,
Md. Mejbahul Sarker
Memorial University of Newfoundland, St. John’s, NL, Canada
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D. Geoff Rideout,
D. Geoff Rideout
Memorial University of Newfoundland, St. John’s, NL, Canada
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Stephen D. Butt
Stephen D. Butt
Memorial University of Newfoundland, St. John’s, NL, Canada
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Md. Mejbahul Sarker
Memorial University of Newfoundland, St. John’s, NL, Canada
D. Geoff Rideout
Memorial University of Newfoundland, St. John’s, NL, Canada
Stephen D. Butt
Memorial University of Newfoundland, St. John’s, NL, Canada
Paper No:
IMECE2012-87856, pp. 1305-1313; 9 pages
Published Online:
October 8, 2013
Citation
Sarker, MM, Rideout, DG, & Butt, SD. "Advantages of an LQR Controller for Stick-Slip and Bit-Bounce Mitigation in an Oilwell Drillstring." Proceedings of the ASME 2012 International Mechanical Engineering Congress and Exposition. Volume 4: Dynamics, Control and Uncertainty, Parts A and B. Houston, Texas, USA. November 9–15, 2012. pp. 1305-1313. ASME. https://doi.org/10.1115/IMECE2012-87856
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