For many years, coiled tubing has been successfully operated from floating facilities. With recent advances relating to the understanding of plastic fatigue of coil, there are evolving concerns associated with the fatigue of a continually moving reel.

This paper quantifies reel motion with respect to the relative position of the reel, heave amplitude and period and the effect of running rates. A fatigue computer model is used to assess the operating limits and time to failure in a hypothetical case and a heave animation simulator is used to optimise rig-up configurations. Real and potential operating solutions are offered and a definition of maximum operating heave is addressed.

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