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Technical Briefs

Experimental Studies on Galling Onset in OCTG Connections: A Review

[+] Author and Article Information
S. Ekwaro-Osire2

Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409stephen.ekwaro-osire@ttu.edu

F. Karpat

Department of Mechanical Engineering, Uludağ University, 16059 Bursa Turkey

2

Corresponding author.

J. Energy Resour. Technol 130(1), 014502 (Feb 04, 2008) (4 pages) doi:10.1115/1.2835616 History: Received November 20, 2006; Revised November 28, 2007; Published February 04, 2008

With today’s high prices for natural gas and oil, the demand for oil and country tubular goods (OCTGs) with superior performance properties is very high. Failures in OCTG can be attributed to numerous sources, for example, makeup torque, corrosion, and galling. Thread galling is the most common mode of failure. This failure often leads to leakage, corrosion of the material, and loss of mechanical integrity. The failure of OCTG eventually amounts to excessive operational costs for the gas and oil industry. Numerous approaches have been taken to improve the galling resistance of OCTG connections. The advocacy of these approaches is often achieved through experimental studies using galling testers. There is a need to design and use effective galling testers to understand and improve the performance of OCTG connections. Thus, the objective of this paper is to present a concise review of literature related to the galling testers that may have applications to OCTG.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Slider-on-block tester configuration

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Figure 2

Button-on-block tester configuration

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Figure 3

Pin-on-disk tester configuration

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Figure 4

Button-on-cylinder tester configuration

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Figure 5

Crossed-cylinder tester configuration (translating specimens)

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Figure 6

Crossed-cylinder tester configuration (translating specimen and rotating specimen)

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Figure 7

Parallel-cylinder tester configuration (rotating cylinders)

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Figure 8

Parallel-cylinder tester configuration (fixed cylinders)

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Figure 9

Concentric-cylinder tester configuration

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