dc.contributor.author | Liu, Y | |
dc.contributor.author | Paez Chavez, J | |
dc.contributor.author | De Sa, R | |
dc.contributor.author | Walker, S | |
dc.date.accessioned | 2017-10-09T09:31:31Z | |
dc.date.accessioned | 2017-11-01T12:25:36Z | |
dc.date.issued | 2017-10-31 | |
dc.description.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 drillbit
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. The
experimental results demonstrate that varying some of the mechanical properties of the drill-string could
in fact control the nature of stick-slip oscillations. | en_GB |
dc.description.sponsorship | Dr. Yang Liu would like to acknowledge the financial support from EPSRC for his First Grant (Grant No. EP/P023983/1). Mr. Scott Walker would like to acknowledge the financial support for the Undergraduate Vacation Scholarship granted by the Carnegie Trust for the Universities of Scotland. | en_GB |
dc.identifier.citation | Published online 31 October 2017 | en_GB |
dc.identifier.doi | 10.1007/s11071-017-3855-9 | |
dc.identifier.uri | http://hdl.handle.net/10871/30103 | |
dc.language.iso | en | en_GB |
dc.publisher | Springer Verlag | en_GB |
dc.rights | © The Author(s) 2017. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. | en_GB |
dc.subject | Drill-string | en_GB |
dc.subject | Stick-slip | en_GB |
dc.subject | Multistability | en_GB |
dc.subject | Non-smooth dynamical system | en_GB |
dc.subject | Numerical continuation | en_GB |
dc.title | Numerical and experimental studies of stick-slip oscillations in drill-strings | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2017-11-01T12:25:36Z | |
dc.identifier.issn | 1573-269X | |
dc.description | This is the final version of the article. Available from Springer Verlag via the DOI in this record. | en_GB |
dc.identifier.journal | Nonlinear Dynamics | en_GB |