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dc.contributor.advisor Spanos, Pol D.
dc.creatorSengupta, Amlan Kumar
dc.date.accessioned 2009-06-04T00:12:05Z
dc.date.available 2009-06-04T00:12:05Z
dc.date.issued 1994
dc.identifier.urihttps://hdl.handle.net/1911/13894
dc.description.abstract Rotary drilling with roller cone bit is often accompanied by wide fluctuations of the weight on bit (WOB). In certain cases the WOB periodically reduces to null. It has been postulated that in these cases the bit lifts off from the formation surface. The present study models the interaction among the lift-off of the bit, the WOB variation, and the modulation of the amplitude of the lobes on the formation surface. The analytical model is used to obtain numerical results for a specific drillstring. From these results it is inferred that the rotary speeds corresponding to the axial resonant frequencies of the system, determined from the functions of the driving point mobility and impedance at the bit, are critical regarding the wide fluctuations of the WOB. They may be associated with the sustenance of the lobes with large amplitude.
dc.format.extent 134 p.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subjectCivil engineering
Mechanical engineering
Mining engineering
dc.title Numerical simulation of the roller cone drill bit lift-off phenomenon
dc.type.genre Thesis
dc.type.material Text
thesis.degree.department Civil and Environmental Engineering
thesis.degree.discipline Engineering
thesis.degree.grantor Rice University
thesis.degree.level Masters
thesis.degree.name Master of Science
dc.identifier.citation Sengupta, Amlan Kumar. "Numerical simulation of the roller cone drill bit lift-off phenomenon." (1994) Master’s Thesis, Rice University. https://hdl.handle.net/1911/13894.


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