Abstract
An overview of higher strength coiled tubing is presented with the advantages and disadvantages associated with the higher strength grades. The advantages include increased tensile load, torsion, burst and collapse limits. These increased limits permit coiled tubing to be used to higher pressures, longer lengths and increased applications. The disadvantages include decreased ductility and toughness with increased susceptibility to environmental cracking.
Knowledge of these advantages and limitations permit safe use of these higher strength grades of coiled tubing. Data is presented on a commercially available 90 ksi minimum yield strength grade with initial test results of a new generation 100 ksi and 110 ksi yield strength grades.
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1998. Society of Petroleum Engineers
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