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Overcoming Challenges in an HP/HT Abandonment in the North Sea


 With the increase in decommissioning/abandonment work in the North Sea, a major operator had the objective to permanently abandon a well that had been temporarily suspended. There were several key challenges associated with this project: high pore pressure and temperature, a completion packer set in a target abandonment interval, and small cement plug volumes. These obstacles had to be overcome to complete the abandonment safely and efficiently. The primary barrier to the deepest potential flow zone, zone 1, was established by running flush slimline tubing through the 5-in. tubing and 9 7/8-in. production packer. The cement plug was then successfully placed below, across, and above the production packer. The cement plug was successfully tagged and inflow tested, creating a primary barrier against zone 1. This approach eliminated the need to remove the production packer prior to the abandonment plug being set, which saved the operator approximately 10 days of rig time. This paper outlines the detailed design preparations and presents the case history where these steps were implemented successfully.