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dc.contributor.authorLiu, Y
dc.contributor.authorPaez Chavez, J
dc.contributor.authorDe Sa, R
dc.contributor.authorWalker, S
dc.date.accessioned2017-10-09T09:31:31Z
dc.date.accessioned2017-11-01T12:25:36Z
dc.date.issued2017-10-31
dc.description.abstractThe 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.sponsorshipDr. 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.citationPublished online 31 October 2017en_GB
dc.identifier.doi10.1007/s11071-017-3855-9
dc.identifier.urihttp://hdl.handle.net/10871/30103
dc.language.isoenen_GB
dc.publisherSpringer Verlagen_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.subjectDrill-stringen_GB
dc.subjectStick-slipen_GB
dc.subjectMultistabilityen_GB
dc.subjectNon-smooth dynamical systemen_GB
dc.subjectNumerical continuationen_GB
dc.titleNumerical and experimental studies of stick-slip oscillations in drill-stringsen_GB
dc.typeArticleen_GB
dc.date.available2017-11-01T12:25:36Z
dc.identifier.issn1573-269X
dc.descriptionThis is the final version of the article. Available from Springer Verlag via the DOI in this record.en_GB
dc.identifier.journalNonlinear Dynamicsen_GB


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