Abstract
In March of 2010, a hook load world record was set on Statoil’s Tucker well in the Gulf of Mexico Walker Ridge Block 543, Well Number 1. A string of 14-inch by 13-5/8-inch casing was landed with a total hook load of over 1,960,000 pounds. The casing string was successfully set to 24,893 MD (24,490 TVD) feet in 6,700 feet of water. With water depths increasing to over 10,000 feet, well depths exceeding 35,000 feet and extended reach targets pushing out over 37,000 feet MD, the worldwide drilling envelop is continually expanding. Operators are deepening the setting depths of larger diameter and heavier casing strings. Maersk Drilling’s new semisubmersible, MÆRSK DEVELOPER, optimized for field development work, designed to be cost effective and capable of drilling 40,000 foot wells in up to 10,000 feet water depth was utilized. The rig is substantially larger and more sophisticated than existing rigs operating in this segment and incorporates a number of innovative features. This case study details the record-setting casing landing operation including planning, preparation, and load path verification. The paper also documents the design, development, manufacture and deployment of the 2-million pound slip-based landing string that was required for this operation. The 6-5/8-inch, heavy wall, 150-ksi yield strength pipe incorporates an innovative thick-walled section in the slip contact area for resistance to slip-crushing loads and a uniquely designed dual-diameter tool joint to increase elevator capacity. Utilizing conventional elevator and slips, the landing string requires only conventional rig-up and operating procedures. Operational savings are realized from the faster makeup and use of standard rig equipment. Additionally, familiar operating procedures promote safe operations and limit accidents.
