Analysis of Downhole Measurements of Drill String Forces and Motions

[+] Author and Article Information
R. A. Cunningham

Hughes Tool Company, Houston, Texas

J. Eng. Ind 90(2), 208-216 (May 01, 1968) (9 pages) doi:10.1115/1.3604616 History: Received June 22, 1967; Online August 25, 2011


The records studied from tests made by Esso Production Research Company confirm and give quantitative values to many phenomena which have been observed qualitatively or which have been indicated by existing evidence. Phenomena that were distinctly shown to exist in some cases are irregular bit rotation, torque fluctuations, bit bouncing, bit weight fluctuations, and large losses of rotary horsepower along the drill stem. In many cases, weight fluctuations appear to be excited by either the rotation of the drill stem or the mud-pump pressure fluctuations, or both. In at least one case, these fluctuations resulted in the bit bouncing clear of the hole bottom.

Copyright © 1968 by ASME
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