Fracture Failure Analysis of Φ50.8mm Coiled Tubing-Reference-Cited by-同舟云学术

Fracture Failure Analysis of Φ50.8mm Coiled Tubing

Published:2020-05 Issue: Volume:993 Page:1235-1241
ISSN:1662-9752
Container-title:Materials Science Forum
language:
Short-container-title:MSF

Author:

Li Na¹,Zhu Li Xia¹,Cong Shen¹,Feng Yao Rong¹

Affiliation:

1. CNPC Tubular Goods Research Institute

Abstract

The fractured coiled tubing of TS90 steel grade Φ50.8 mm ×3.96 mm in a certain oilfield was analyzed through macroscopic observation, magnetic powder inspection, physical and chemical properties testing, microstructure analysis and SEM analysis. The results showed that the coiled tubing fracture belonged to fatigue fracture and the fatigue crack originated from the area of cyclic friction on the outer surface of the tubing. The cyclic axial plastic stress of the tubing in service caused micro-cracks in the source area and finally led to fatigue fracture failure of the tubing.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Link

https://www.scientific.net/MSF.993.1235.pdf

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