Effect of Some Material, Manufacturing, and Operating Variables on the Friction Coefficient in OCTG Connections

[+] Author and Article Information
H. J. Carper, A. Ertas

Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409-1021

J. Issa

Exxon Production Research Company, Houston, TX 77252-2189

O. Cuvalci

Karadeniz Teknik Universitesi, Turkey

J. Tribol 114(4), 698-705 (Oct 01, 1992) (8 pages) doi:10.1115/1.2920938 History: Received January 29, 1992; Revised May 01, 1992; Online June 05, 2008


Results are presented from an experimental study conducted to determine friction coefficient behavior in OCTG connections. The study was conducted using the OCTG friction and galling tester at Texas Tech University. The tester employs tubular pin and box specimen pairs fabricated from 73-mm (2 7/8 in.) diameter OCTG tubing. Friction coefficient was determined for test specimens made of material grades L80 and J55 at loads of up to 620 kN (140,000 lb) acting on a surface area of up to 645 mm2 (1 in.2 ) with sliding velocities of 0.53 and 1.78 cm/s (1 and 3.5 ft/min), and nominal surface roughnesses of 0.37, 1.2, and 1.5 micron (15, 47, and 60 μin.) Ra. An API Modified thread compound was used for all tests. When plotted versus the applied load, the friction coefficient behavior is seen to be highly nonlinear. In addition to load, the variables of sliding velocity, material, and surface roughness are shown to have an effect. Preliminary experiments show that the test surface geometry also has a significant effect on the friction coefficient.

Copyright © 1992 by The American Society of Mechanical Engineers
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