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 drill bit lifts off from the formation surface. The present study models the interaction among the lift-off of the drill 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 drill bit, are critical regarding the wide fluctuations of the WOB; they may be associated with the sustenance of the lobes with large amplitude.
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September 1995
Research Papers
Modeling of Roller Cone Bit Lift-Off Dynamics in Rotary Drilling
P. D. Spanos,
P. D. Spanos
Department of Civil Engineering, Rice University, P. O. Box 1892, Houston, TX 77251
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A. K. Sengupta,
A. K. Sengupta
Department of Civil Engineering, Rice University, P. O. Box 1892, Houston, TX 77251
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R. A. Cunningham,
R. A. Cunningham
Department of Mechanical Engineering, Rice University, P. O. Box 1892, Houston, TX 77251
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P. R. Paslay
P. R. Paslay
Rice University, P.O. Box 1892, Houston, TX 77251
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P. D. Spanos
Department of Civil Engineering, Rice University, P. O. Box 1892, Houston, TX 77251
A. K. Sengupta
Department of Civil Engineering, Rice University, P. O. Box 1892, Houston, TX 77251
R. A. Cunningham
Department of Mechanical Engineering, Rice University, P. O. Box 1892, Houston, TX 77251
P. R. Paslay
Rice University, P.O. Box 1892, Houston, TX 77251
J. Energy Resour. Technol. Sep 1995, 117(3): 197-207 (11 pages)
Published Online: September 1, 1995
Article history
Received:
July 23, 1994
Revised:
March 1, 1995
Online:
January 22, 2008
Citation
Spanos, P. D., Sengupta, A. K., Cunningham, R. A., and Paslay, P. R. (September 1, 1995). "Modeling of Roller Cone Bit Lift-Off Dynamics in Rotary Drilling." ASME. J. Energy Resour. Technol. September 1995; 117(3): 197–207. https://doi.org/10.1115/1.2835341
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