A large number of Mœrsk Olie Og Gas AS completions in the Danish Sector of the North Sea utilise Sliding Side Doors (SSD's) as a means of zonal isolation. As the majority of the completions are in highly deviated / horizontal wells, these sleeves are manipulated by shifting tools on coiled tubing (CT). Experience has shown that the operating of SSD's on coiled tubing can lead to uncertainties in the true status of the sleeve position. Several cases have arisen where subsequent Memory Production Logging Tool (MPLT) surveys have identified SSD's that were not in their expected status.

Though MPLT's were successful in the determination of SSD status, operational and cost considerations required a new approach. What was required was a reliable, accurate means of verifying SSD sleeve position with data acquired on the same run as the sleeve manipulation tool. There were two strands to this project, the proof of concept in the ability to identify sleeve position using Memory Casing Collar Locator (MCCL) data, and the development of a "stand-alone" MCCL tool, rugged enough to be run in conjunction with the SSD manipulation tools.

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