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Fracture Failure Analysis of Φ50.8mm Coiled Tubing
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Fracture Failure Analysis of Φ50.8mm Coiled Tubing
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Journal Article
Fracture Failure Analysis of Φ50.8mm Coiled Tubing
2020
Overview
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
