NDLI: Practical approach to modelling and controlling stick-slip oscillations in oilwell drillstrings

Content Provider	IEEE Xplore Digital Library
Author	Navarro-Lopez, E.M. Suarez, R.
Copyright Year	2004
Description	Author affiliation: Res. Programme on Appl. Math. & Comput. Sci., Inst. Mexicano del Pet., Cardenas, Mexico (Navarro-Lopez, E.M.; Suarez, R.)
Abstract	Stick-slip friction-induced oscillations appearing in oilwell drillstrings are a source of failures which reduce penetration rates and increase drilling operation costs. For this reason, a major problem to solve is modelling the drillstring torsional behaviour and proposing control solutions to help reduce stick-slip phenomenon. This paper is focused on both problems. On the one hand, it presents dynamic drillstring models in order to reproduce stick-slip vibrations under different operating conditions. The model used for the torque on the bit is the main difference with respect to other models proposed in the literature. On the other hand, some experience-based control strategies are evaluated in order to reduce stick-slip oscillations. These strategies uses the angular velocity at the drillstring upper part, the torque on the bit and the weight on the bit, proved to have a key importance in the reduction of drillstring torsional vibrations. The control approach followed is a decentralized one, i.e., the angular velocity at the top end of the drillstring and the bit velocity are controlled separately. The driller makes the supervisory task.
Sponsorship	IEEE Control Syst. Soc
Starting Page	1454
Ending Page	1460
File Size	515772
Page Count	7
File Format	PDF
ISBN	0780386337
DOI	10.1109/CCA.2004.1387580
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-09-02
Publisher Place	Taiwan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Drilling Torque Angular velocity Costs Angular velocity control Rotation measurement Velocity measurement Drag Springs Resists
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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