Pitting, tensile overloading produce most coiled-tubing failures

A survey of coiled-tubing failures in various field applications shows that pitting and tensile overloads induce the greatest number of coiled-tubing failures.Fatigue and weld area failures incurred the next most common type followed by H2S and brine-water corrosion.Most failures occurred at well depths between 5,001 and 10,000 ft (1,524.3 and 3,048 m). Also, most failures occurred in the coiled-tubing string near the surface. Failures in roughly similar numbers were reported in grade types 70, 80, and 100.The understanding of the principal modes of failure reported below should help improve handling and running procedures to minimize coiled-tubing failures. The 30 case studies discussed ...

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