Root cause analysis of the corrosion-related coiled tubing failure

Original scientific paper

  • Sanja Martinez Research Laboratory for Corrosion Engineering and Surface Protection - ReCorr, Department of Electrochemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Croatia https://orcid.org/0000-0002-9924-3437
  • Fuad Khoshnaw School of Engineering and Sustainable Development, Faculty of Computing, Engineering and Media, De Montfort University, Leicester, United Kingdom https://orcid.org/0000-0002-4467-1944
  • Vuokko Heino VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, 02044, VTT, Finland https://orcid.org/0000-0003-2753-0020
  • Sara Fahmi Materials Management Consultant, Infosys Ltd., 6002 Rogerdale Road, Houston, USA https://orcid.org/0000-0002-1882-7001
  • Talal Aljohani Materials Science Research Institute, King Abdulaziz City for Science and Technology (KACST), Riyadh, 12354, Saudi Arabia https://orcid.org/0000-0003-3530-8809
  • Sally Elkatatny Mechanical Engineering Department, Faculty of Engineering, Suez Canal University, Ismailia, 41522, Egypt https://orcid.org/0000-0003-2135-2593
Keywords: Coil tubing, corrosion, failure analysis, microbiological induced corrosion
Graphical Abstract

Abstract

Coiled tubing (CT) is widely used in the oil and gas industry. However, corrosion-related failures are frequently reported. Research into the causes of failures leads to improvement in the design of components and processes. In this study, a new CT sample and a CT sample with perforated wall that had failed after a few acidizing operations were selected for analysis. Scanning electron microscope (SEM) images at the fracture site showed that CT damage was caused by the low cycle fatigue. In addition, light and scanning electron microscopy (SEM) showed that a corrosion pit acted as the initiator of the crack. Elemental analysis using energy dispersive X-ray spectroscopy (EDS) indicated the presence of an iron oxide layer and a layer associated with the Sb containing inhibitor. The corrosion damage investigation showed that the internal CT wall pits likely formed during storage due to the acidizing operations in the areas where the remaining liquid was still at the tube bottom.

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Published
13-03-2022
Section
Electrochemical Engineering