This paper describes the results obtained as well as the equipment and techniques used on the Glenelg field in the UK central North Sea (CNS) to perforate and complete a new high-pressure high-temperature (HPHT) production well.

This paper begins by discussing the types of equipment required for HPHT coiled-tubing (CT) intervention. This includes the front-end engineering for the hottest, deepest, highest pressure, and most deviated well produced from, to date, in the UK CNS. This paper discusses the CT string design, as well as the selection of downhole tools, for temperatures above 400°F. The CT intervention, wireless casing collar locator (WCCL), depth correlation, and perforating operations are presented. This is the hottest environment in which WCCL technology has been successfully applied worldwide.

The lessons learned during this project, together with the results from this case history, are presented. Conclusions are drawn about moving forward with both the WCCL technology and conducting similar operations.

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