The coiled tubing (CT) industry continues to operate in deeper and higher-pressure wells.1  Under these demanding service conditions, performance and reliability of the tubing are essential. This paper discusses field service and other events that led to an aggressive plan to introduce new inspection techniques that will help assure a higher level of performance of coiled tubing strings. The enhanced inspection techniques being instituted include inspection by the tubing manufacturer of the incoming strip and continuous phased-array ultrasonic inspection of the seam weld. In addition, the traditional through-hole calibration standards were upgraded with more realistic discontinuities to help ensure that the produced tubing is defect-free. The paper also discusses the important requirements of string management and maintenance procedures. A key to the success of this ongoing program has been the synergistic activity between the service company and the tubing manufacturer.

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