An offshore well located in Eugene Island Block 384 in the Gulf of Mexico loaded up and ceased flowing. This behavior was attributed to an unstable flow regime caused by declining gas production in the field and by the large flow area of the 41/2-in. completion string. To re-establish stable flow, a smaller size production tubing was required to decrease the flow area and thereby increase gas velocities. Because of the declining production, mobilizing a worko ver rig to perform a recompletion was considered uneconomical. The well was evaluated for installation of a 2 3/8-in. coiled-tubing production string with packer, gas lift mandrel, landing nipples, and subsurface safety valve (SSSV) completion equipment. A coiled-tubing unit was mobilized, and the 2 3/8-in. coiled-tubing recompletion was successfully performed inside the existing 41/2-in. completion. The well was returned to stable production at approximately 40% of the cost of a workover-rig operation. This paper discusses the successful recompletion job design and field installation on the subject well and addresses the economic viability of using large-diameter coiled tubing as a permanent completion in offshore applications.

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