Surface Galling Mechanism Analysis of Rotary Shouldered Thread Connection

Fang Po Li

doi:10.4028/www.scientific.net/MSF.993.1286

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HomeMaterials Science ForumMaterials Science Forum Vol. 993Surface Galling Mechanism Analysis of Rotary...

Surface Galling Mechanism Analysis of Rotary Shouldered Thread Connection

Abstract:

In this paper, surface galling failure process and mechanism of drill pipe’s rotary shouldered thread connection (RSTC) was studied by means of full-scale make-up and break-out (M&B) testing. The results showed that surface galling damage mainly appearred at the positions of leading flank, bearing flank and make-up shoulder of RSTC. The galling damage of three different positions was a process of mutual independence and mutual promotion, and they might appear simultaneously, and also appear at different stage. The surface galling failure was mainly due to metal’s plastic deformation and peeling off under the effect of compressive stress caused by friction and compression effect among the contacting metal surface. During M&B testing, deformed and peeling metal accumulated continually and resulted in "cold welding" at local position. In the subsequent M&B process, "cold welding" metal was torn open and peeled off from metal matrix, and metal surface galling was getting serious gradually. M&B testing results showed that torque load and thread compound had decisive influence on surface galling damage, while the influence of RSTC’s surface wear, rearranging, torque fluctuations and tensile load was not obvious.

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Periodical:

Materials Science Forum (Volume 993)

Pages:

1286-1292

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.993.1286

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Online since:

May 2020

Authors:

Fang Po Li*

Keywords:

Galling, M&B Test, Rotary Shouldered Thread Connection, Surface Damage

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References

[1] API Spec 7-2:2008 Specification for threading and gauging of rotary shouldered thread connection [S].

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[2] API 5DP:2009 Specification for drill pipe [S].

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[3] SY/T 6897-2012 Make-up and break-out test procedure of drilling tools [S].

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[4] ISO 13678:2010 Petroleum and natural gas industries - evaluation and testing of thread compounds for use with casing, tubing, line pipe and drill stem elements [S].

DOI: 10.3403/30147014u

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[5] ISO13679:2002 Petroleum and natural gas industries-procedures for testing casing and tubing connections [S].

DOI: 10.3403/30378703

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