Stick-slip vibrations of PDC bits

Thomas Richard, Emmanuel M Detournay

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

Under certain conditions of deep drilling with PDC bits, violent stick-slip torsional vibrations take place in the drilling strueture. In the classical approach used to analyze this problem, it is assumed that stick-slip events arc triggered by a bit-rock interaction law, characterized by a decrease of the torque with angular velocity (which is formally equivalent to a decreasing apparent friction coefficient with angular velocity). Based on laboratory data, we argue that this relationship is not an intrinsic characteristic of the bit-rock interaction. We then elaborate on the coupling between vertical and torsional vibrations at the bit as a possible primary cause of stick-slip. Preliminary results obtained with this model indicate that such coupling is sufficient to generate stick-slip without the need to assume a decreasing friction coefficient.

Original languageEnglish (US)
Title of host publication4th North American Rock Mechanics Symposium, NARMS 2000
PublisherAmerican Rock Mechanics Association (ARMA)
Pages33-40
Number of pages8
ISBN (Print)9058091554, 9789058091550
StatePublished - 2000
Event4th North American Rock Mechanics Symposium, NARMS 2000 - Seattle, United States
Duration: Jul 31 2000Aug 3 2000

Publication series

Name4th North American Rock Mechanics Symposium, NARMS 2000

Other

Other4th North American Rock Mechanics Symposium, NARMS 2000
Country/TerritoryUnited States
CitySeattle
Period7/31/008/3/00

Bibliographical note

Funding Information:
ACKNOWLEDGMENTS The research presented in this paper is funded by a grant from BP Amoco and Security DBS. This support is gratefully acknowledged.

Publisher Copyright:
© 2000 Balkema, Rotterdam.

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