This paper discusses the upgrade of the Discoverer 534, from a turret moored 3500 ft [1100 m] rated drillship, to a fully dynamic positioned vessel rated at 6000 ft [1830 m] water depth. After the upgrade, the vessel commenced drilling in 3730 ft [1137 m] water depth which will be followed by a well in 5900 ft [1800 m] waters during the first quarter of 1991. This will be a world water depth record for a vessel with a 18-3/4 in. [476 irm] BOP stack and a 21 in. [533 mm] drilling riser.

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