RESEARCH PAPERS: Other Technical Papers

Optimum Torque for Drill Collar Makeup

[+] Author and Article Information
P. D. Weiner

Texas A&M University, College Station, Texas

M. E. True

Exxon Company, Houston, Texas

J. Eng. Ind 96(1), 294-298 (Feb 01, 1974) (5 pages) doi:10.1115/1.3438316 History: Received June 18, 1973; Online July 15, 2010


Drill collar connection failure frequency increases when wells are drilled deeper and when directional holes are drilled. These failures, which materially increase the cost of operations, prompted a study to find the best way to make up drill collar connections for achieving maximum joint life. This paper discusses the results of an investigation conducted by Texas A&M University Research Foundation to (1) determine from laboratory tests the optimum makeup torque for a select number of typical drill collar connections, (2) develop an analytical method of calculating optimum makeup torques for all sizes and types of drill collar joints, and (3) compare the laboratory derived torque makeup with those predicted by the analytical method. The close correspondence of the laboratory and analytical values supports the use of the analytical method for predicting torque makeup for those sizes and types of drill collar joints not tested in the laboratory.

Copyright © 1974 by ASME
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