Coiled Tubing Cement Packer Repair at Prudhoe Bay, History and Current Techniques

Abstract Packer repair utilizing CT is an important non-rig remediation in the greater Prudhoe Bay Area, Alaska where rig workover costs are significant. To date, approximately 22 CT packer repairs have been performed with a 100% success rate. This high success rate has resulted in investigating possible improvements in efficiency. These are primarily associated with reducing cement and plug milling operations. This paper presents the history of packer leak detection and repair at Prudhoe Bay. Diagnostics are detailed, including conventional logging methods with temperature, spinner, and waterflow logs. Additionally, the newly developed ultrasonic leak detection log is described. This tool has the ability to detect ultra small leaks and has led to an increase in number of candidates. Cement packer repair design is discussed, as well as detailed CT operation guidelines. Recent improvements and optimizations to techniques are presented along with areas for future investigations.

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