Grade P110 Tubing Shredded by Downhole Detonation

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• 作者：Michael G. Burns ; Kenneth P. Malloy
• 关键词：Grade P110 tubing ; Detonation ; Intermittent collapse
• 刊名：Journal of Failure Analysis and Prevention
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：17
• 期：1
• 页码：38-42
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Tribology, Corrosion and Coatings; Characterization and Evaluation of Materials; Classical Mechanics; Structural Mechanics; Quality Control, Reliability, Safety and Risk;
• 出版者：Springer US
• ISSN：1864-1245
• 卷排序：17

文摘

A failure analysis was performed on a length of API 5CT Grade P110 tubing that failed while being used in a drilling operation. Approximately 10 feet of the tubing was shredded by axial slits, and there were collapsed zones above and below the failure. The slits were at 45° to the tubing surface and showed very fine microvoid coalescence. Metallographic examination showed that the slits had formed along adiabatic shear bands. The presence of adiabatic shear bands indicated an extremely high strain rate. That, combined with the orientation of the slits, indicated that the failure was caused by a detonation of gasses in the annulus surrounding the tubing. Well operations responsible for the detonation will be briefly addressed.