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TECHNICAL PAPERS

Effect of Downhole Assembly and Polycrystalline Diamond Compact (PDC) Bit Geometry on Stability of Drillstrings

[+] Author and Article Information
M. A. Elsayed, D. W. Dareing, C. A. Dupuy

Mechanical Engineering Department, University of Southwestern Louisiana, P.O. Box 44170, Lafayette, LA, 70504-4170

J. Energy Resour. Technol 119(3), 159-163 (Sep 01, 1997) (5 pages) doi:10.1115/1.2794984 History: Received February 29, 1996; Revised May 21, 1997; Online November 06, 2007

Abstract

Stability of drillstrings equipped with PDC bits depends on many factors such as the design of the drillstring, design of the bit, and formation type. In this paper, we show that the drill pipe plays a minor role in stability in comparison with that of the drill collars. We also show that the number of bit blades affects the location of the stability pockets, while their spacing affects the size of these pockets. Using this data, a combination of drill collar and bit design can be used to provide operating speeds resulting in maximum stability of the drillstring.

Copyright © 1997 by The American Society of Mechanical Engineers
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