National Oilwell Varco (NOV) recently developed 140-ksi specified minimum yield strength (SMYS) coiled tubing, or CT140. Because the target market for high-strength tubing is high-pressure well intervention and completions, sour gas compatibility testing was performed. The testing program verified that while using chemical inhibitors, the tubing/inhibitor system was not susceptible to sulfide stress cracking. In this video from the 2017 SPE/ICoTA Coiled Tubing and Well Intervention Conference in Houston on 21 March, Kevin Elliot, NOV Product Engineering Manager, discusses the development process that was undertaken, as well as the resulting mechanical properties and fatigue life of CT140.
For more information about this project, please see SPE 184806, “Development and Compatibility Testing of Coiled Tubing With 140-ksi Specified Minimum Yield Strength.”