As coiled tubing (CT) has matured as a service, the complexity and length of toolstrings has increased. Today, even with a 100-ton crane, operators are often required to make multiple runs rather than employ a single toolstring. In environments where lifting heights are more limited, such as mast-based CT units (CTUs), this can lead to many runs and inefficient operations. Historically, deploying tools in sections hung off in a blowout preventer (BOP) has been used to address this. However, this solution has typically been avoided because of the complexity and hazard of the operation. The groundwork for improving this operation was laid out by Thomeer and Eslinger in their 1992 paper, Safe Deployment of Specialized Coiled-Tubing Tools in Live Wells (SPE-24621MS presented at the SPE Annual Technical Conference and Exhibition). The present work was done to improve the safety and efficiency of the entire bar deployment operation. It was first used in Alaska to deploy 560 feet of perforating guns where it replaced 26 runs with 3 logging runs and 3 perforating runs, saving 5.8 CTU days.

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