Field Application of Externally Stress-Relieved Drill Collars

[+] Author and Article Information
L. A. Primm

Shell Oil Company, Denver, Colorado

J. Pressure Vessel Technol 99(1), 149-151 (Feb 01, 1977) (3 pages) doi:10.1115/1.3454499 History: Received June 15, 1976; Online October 25, 2010


This paper discusses the 1975 field results of the application of external stress relief grooves on drill collars. It contains a formula for the calculation of the groove diameter and makes recommendations for how and where to cut these features. Increased connector fatigue life was gained.

Copyright © 1977 by ASME
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