A critical review of the coiled tubing friction-reducing technologies in extended-reach wells. Part 2: Vibratory tools and tractors

In the first part of this critical review study, the most important aspects related to the CT lubricants, including their laboratory and field performance and the current understanding of their predictability and reliability within the CT industry, were discussed. In this second part, the same aspects for CT vibratory tools and tractors are discussed for the first time, focusing on the challenges and limitations encountered in the field. It is shown that field performance studies regarding vibratory tools and tractors are mostly anecdotal or proprietary. Given their importance for well intervention operations in extended-reach wells, it is hoped that this critical review will trigger further research and development of CT vibratory tools and tractors and best field practices to improve their predictability and reliability in the field.