Understanding Coiled Tubing Fatigue Damage And Its Influencing Factors

12th June 2019                         COILED TUBING DRILLING                          

Author: Marat Seitimov

Coiled Tubing (CT) has been widely used for well intervention, servicing and drilling. It has become widely used due to its low cost, fast mobilization, and high efficiency. The CT unit’s major consumable is coiled-tubing pipe, which is rolled onto the reel (drum). The tubing moves from the reel over the tubing-guide arch, called a gooseneck, repeatedly during operation and is usually under constant internal pressure loading. This leads to the fatigue damage of the tube; therefore, it is very important to keep track of the most fatigued zones to prevent any pipe fractures during operations that could result in tubing and BHA loss. We must note that the fatigue factor in the life of CT is unavoidable, and currently cannot be measured non-destructively. Foremost, to reduce the likelihood of coiled tubing string failures and improve reliability of the operations, it is critical to . . . 

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