Sour-Well Serviceability of Higher-Strength Coiled Tubing

A joint-industry project (JIP) was initiated approximately 2 years ago to extend the research conducted into the serviceability of coiled tubing (CT) for under-balanced sour-well drilling and work-over operations to higher-strength [90- to 110-ksi specified-minimum-yield-stress (SMYS)] grades. A significantly different and unique laboratory testing protocol is used in the present JIP research. The methodology calls for full-body tubing specimens that have been immersed in a sour solution of varying severity followed by testing in a bend-fatigue machine (BFM) to determine the low-cycle fatigue performance of high-strength CT materials degraded by exposure to a sour environment.

View a Synopsis of SPE 107014 published in JPT.

This article, written by Assistant Technology Editor Karen Bybee, contains highlights of paper SPE 107014, “Sour-Well Serviceability of Higher-Strength Coiled Tubing,” by H.B. Luft, T. Padron, and E. Kee, BJ Services Co. Canada Ltd., and E. Szklarz, Shell Canada Ltd., prepared for the 2007 SPE/ICoTA Coiled Tubing and Well Intervention Conference and Exhibition, The Woodlands, Texas, 20–21 March.

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