... parted became very common. Figure 1 shows the crack length vs the normalized hoop stress for the fatigue tests performed for this analysis. It is important to note that as the samples were obtained after the CT had been placed on a reel, it was not always possible to position the ERW weld...

... be grouped in the following categories: Cable strength and comprehensive fatigue tests Cable constructional stretch removal process Live well-control running qualification process In this paper, we will elaborate on the design of the specific cable design changes, qualification tests, post...

... included in CT fatigue models. The CT also experiences diametrical growth and elongation. Almost all fatigue testing is done without rotating the CT sample. Diameter growth models based on these fatigue tests have over predicted the amount of diametrical growth. This ongoing work has already shown...

... that has been implemented and is now being used by a significant portion of the CT industry. material model Upstream Oil & Gas fatigue model strain range bias weld model diametrical growth fatigue life stress strain range base material model fatigue test point manufacturer life...

... Abstract In recent years, the performance envelope of coiled tubing (CT) has expanded because of improvements in tubing manufacture and the prediction of low-cycle fatigue life. More accurate life predictions have been achieved with data from laboratory-scale and full-scale CT fatigue tests...