Self-Excited Vibrations Induced by Drag Bits

[+] Author and Article Information
D. Dareing, J. Tlusty, C. Zamudio

Mechanical Engineering Department, University of Florida, Gainseville, FL 32611

J. Energy Resour. Technol 112(1), 54-61 (Mar 01, 1990) (8 pages) doi:10.1115/1.2905713 History: Received June 01, 1989; Revised November 26, 1989; Online April 16, 2008


Drillstring vibrations cause premature failure of downhole tools and the drillstring itself. Also, drill bits do not drill efficiently as a result of these vibrations and this inefficiency causes a significant reduction in penetration rate and a corresponding increase in footage cost. Drill bits are a primary source of excitation, but there has been no theory that adequately explains how drag bits excite drillstrings. The paper shows that these vibrations are self-excited by the interaction of drillstring, drill bit, and formation. The paper explains the mechanism for this self-excitation. Results show that drag bit design, shock absorber design and bit rotational speed dictate conditions of dynamic instability.

Copyright © 1990 by The American Society of Mechanical Engineers
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