Some New Results in Coiled Oilfield Tubing Inspections

Coiled tubing (CT) strings are now regularly 35,000-ft. long. The seam weld in HSLA coiled oilfield tubing has been difficult to inspect for longitudinal imperfections and defects even with the use of UT. In-line ET units are ineffective on the tight defects found is the seam weld of this EW tubing. In this paper we present results from the use of phased array UT (PAUT) on the seam weld, and also on the 45° skelp-end welds that join the strips together before the tubes are milled. Magnetic flux leakage systems have evolved for both the final inspection after hydrostatic test, and for field inspections. Improvements to the suppression of excessive MFL from the seam welds is discussed, and some typical results of recent inspections are given.

References
Specification for Coiled Tubing, Amer. Petroleum Institute (API), Washington 2010. Stanley, R. K, “Results from Inspections of Coiled Tubing,” Proceedings of the SPE/Icota Conference, Houston, Texas, Society of Petroleum Engineers, April 1998 Stanley, R. K, “Results of Recent Inspections Performed on Coiled Tubing,” Proceedings of the SPE/Icota Conference, Houston, Texas, Society of Petroleum Engineers, May 1999. Stanley, R. K, “Problems Associated With Coiled Tubing,” Proceedings from the International Chemical and Petroleum Conference, Houston, Texas 2001. McCoy, T., R Rosine, C Aulert, J Martin and R. K. Stanley, “HPHT Wells Create New Challenges of Coiled Demanding Higher Levels of Inspection and Management,” SPE paper74830, Proc. SPE/Icota Mtg, April 2002, The Woodlands, Tx. Stanley, R. K., “Magnetic Methods for Wall Thickness Measurement and Flaw Detection in Ferromagnetic Tubing and Plate,” Insight 38(1), pp 51-55. Stanley, R. K, “Observations on Magnetic Wall Measurements on Coiled Tubing,” Materials Evaluation, Feb. 2004, pp 125-128. Stanley, R. K., “Some New Developments Applicable to Coiled Tubulars,” SPE Paper 94058, SPE/Icota meeting, The Woodlands TX April 2005. Stanley, R. K., “An Assessment Tool for Coiled Tubing,” Materals Evaluation 70(6), June 2012, pp 765-774. Torresgrossa, M., L Zsolt,Zwanenberg, M., “Optimizing Pipe Management with a New Approach of Coiled Tubing Integrity Monitoring,” SPE paper 168303, SPE/Icota meeting, March 2014, The Woodlands, TX.
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