Yang Liu
Numerical and experimental studies of stick-slip oscillations in drill-strings.
Authors
Joseph
Rulston De Sa
Scott Walker
Abstract
The cyclic nature of the stick-slip phenomenon may cause catastrophic failures in drill-strings or at the very least could lead to the wear of expensive equipment. Therefore, it is important to study the drilling parameters which can lead to stick-slip, in order to develop appropriate control methods for suppression. This paper studies the stick-slip oscillations encountered in drill-strings from both numerical and experimental points of view. The numerical part is carried out based on path-following methods for non-smooth dynamical systems, with a special focus on the multistability in drill-strings. Our analysis shows that, under a certain parameter window, the multistability can be used to steer the response of the drill-strings from a sticking equilibrium or stick-slip oscillation to an equilibrium with constant drill-bit rotation. In addition, a small-scale downhole drilling rig was implemented to conduct a parametric study of the stick-slip phenomenon. The parametric study involves the use of two flexible shafts with varying mechanical properties to observe the effects that would have on stick-slip during operation. Our experimental results demonstrate that varying some of the mechanical properties of the drill-string could in fact control the nature of stick-slip oscillations.
Citation
LIU, Y., PÁEZ CHÁVEZ, J., DE SA, R. and WALKER, S. 2017. Numerical and experimental studies of stick-slip oscillations in drill-strings. Nonlinear dynamics [online], 90(4), pages 2959-2978. Available from: https://doi.org/10.1007/s11071-017-3855-9
Journal Article Type | Article |
---|---|
Acceptance Date | Oct 7, 2017 |
Online Publication Date | Oct 31, 2017 |
Publication Date | Dec 31, 2017 |
Deposit Date | Dec 1, 2017 |
Publicly Available Date | Dec 1, 2017 |
Journal | Nonlinear Dynamics |
Print ISSN | 0924-090X |
Electronic ISSN | 1573-269X |
Publisher | Springer |
Peer Reviewed | Peer Reviewed |
Volume | 90 |
Issue | 4 |
Pages | 2959-2978 |
DOI | https://doi.org/10.1007/s11071-017-3855-9 |
Keywords | Drill string; Stickslip; Multistability; Dynamical system; Numerical continuation |
Public URL | http://hdl.handle.net/10059/2612 |
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LIU 2017 Numerical and experimental studies
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Publisher Licence URL
https://creativecommons.org/licenses/by/4.0/
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