Phillips Petroleum identified surface wellhead and blowout preventer (BOP) nipple up and nipple down time as an area where significant improvements in safety and savings in rig time could be made on the Audrey field in the southern North Sea UK sector.

With a view toward future use on central North Sea high-temperature, high-pressure exploration and development wells drilled from heavy jack-up rigs, a unitized wellhead system designed for use with a single 18-3/4" BOP stack and a mudline suspension system has been fabricated and used successfully on three development wells on the Audrey Phase II Project and on one exploration well in the southern North Sea.

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