Deepwater Nautilus

History
Name	Deepwater Nautilus
Owner	Triton Nautilus Asset Leasing GmbH, a subsidiary of Transocean
Operator	Transocean
Port of registry	Panama
Route	Gulf of Mexico
Ordered	December 1998
Builder	Hyundai Heavy Industries
Way number	89
Laid down	January 15, 1999
Completed	2000
Acquired	January 15, 2000
Identification	ABS class no.: 0036567 Call sign: HP-9953 IMO number: 8764781
Status	operational
Notes
General characteristics
Class and type	ABS +A1 Column Stabilized CDS, P, PAS
Tonnage	29,051 GT 8,715 NT
Length	114 m (374 ft)
Beam	78 m (256 ft)
Draught	23 m (75 ft)
Depth	41.5 m (136 ft)
Installed power	4 × Wärtsilä 12V32D 6300 hp diesel engines 4 × ABB generators
Capacity	Drill water: 3,142 m3 (111,000 cu ft) Potable water: 675 m3 (23,800 cu ft) Fuel oil: 4,293 m3 (151,600 cu ft) Bulk mud: 462 m3 (16,300 cu ft) Bulk cement: 231 m3 (8,200 cu ft)
Notes

Deepwater Nautilus is an ultra-deepwater, semi-submersible offshore drilling rig. Built in 2000 in South Korea, she is owned by Transocean, registered in Panama, and currently leased to Royal Dutch Shell for drilling operations in the Gulf of Mexico.

Description

Deepwater Nautilus is a fifth-generation, RBS-8D design, ultra-deepwater, column-stabilized, semi-submersible mobile offshore drilling unit, designed to drill subsea wells for oil exploration and production. She was designed by Reading & Bates RBS-8M and built by Hyundai Heavy Industries in 2000 at the Ulsan shipyard in South Korea. Deepwater Nautilus can operate at water depths up to 8,000 feet (2,400 m) and has drilling depth down to 30,000 feet (9,100 m).

History

Drilling

In 2000, Deepwater Nautilus set the world water-depth record for an offshore drilling rig operating in moored configuration at 7,785 feet (2,373 m) at the Alaminos Canyon block 557 in the United State sector of the Gulf of Mexico. In 2002, Deepwater Nautilus discovered oil at the Shell-operated Great White oil field in Alaminos Canyon block 813. On 6 March 2002 she drilled a well in water depth of 8,009 feet (2,441 m) at the Great White field (Alaminos Canyon block 857). At the same year, the new record was set at 8,070 feet (2,460 m) while drilling at the Alaminos Canyon block 813. This record was surpassed in 2003 by waterdepth of 8,717 feet (2,657 m) at the Alaminos Canyon block 857. In 2004, the water-depth of 8,951 feet (2,728 m) was achieved in Lloyd block 399. In March 2009, Deepwater Nautilus discovered oil at the Appomattox prospect in Mississippi Canyon blocks 391 and 392.

Incidents

In 2004, at the time of Hurricane Ivan Deepwater Nautilus broke free from its location. In 2005, as a result of Hurricane Katrina Deepwater Nautilus had drifted off location. All personnel had been safely evacuated before the approach of the storm. The rig's mooring system revealed significant damage and the rig lost approximately 3,200 feet (980 m) of marine riser and a portion of the subsea well control system. Less than a month later, Deepwater Nautilus broke free during Hurricane Rita.