Transocean :: Discoverer Clear Leader

Discoverer Clear Leader
The DISCOVERER CLEAR LEADER is a double hulled dynamically positioned drillship (Transocean Offshore enhanced Enterprise-class design), capable of operating in moderate environments and water depths up to 12,000 feet (3,657m) using a 18¾-inch 15000 psi BOP and a 21 in OD marine riser.
Rig Type	6th Generation Deepwater
Design	Transocean Offshore enhanced Enterprise-class, double hull, dual drilling activity.
Builder	Okpo, South Korea
Year Built	2009
Classification	DNV Drill Class 1A1, ship-shaped drilling unit, EO DYNPOS, AUTR, DRIL, HELDK, CRANE, TEMPSTORE
Flag	Marshall Islands
Accommodation	200 berths
Helideck	Sized for Chinook 234 helocopter.
Moonpool	72 1/2 ft. x 30 ft
Station Keeping	Dynamically Positioned
Max Drill Depth	40,000 ft / 12,191 m
Max Water Depth	12,000 ft / 3,657 m
Operating Conditions	Wind 60 knots, Wave 30 ft
Storm Conditions	Wind 100 knots, Wave 50 ft

Technical Dimensions

Capacities

Drilling Equipment

Derrick	226 ft x 80 ft x 80 ft base with 20 ft x 60 ft top dual-activity derrick
Drawworks	2 x NOV active heave compensating, rated 1,000 ST with 2-inch line
Motion Compensator	2 x NOV active heave compensating, rated 1,000 ST with 2-inch line
Top Drive	2 x Maritime Hydraulics MDDM 1,250 ST with 2 each AC variable frequency driver motors
Rotary	1 x NOV 75 1/2 inch hyrdraulic forward, 1 x NOV 60 1/2 inch aft
Pipe Handling	2 Varco PRS-5 pipe racking systems, 1 PLS
Mud Pumps	5 NOV Hex 240 pumps 7,500 psi, each powered by 2 AC electric motors
Shale Shakers	10 x Brandt LCM-3D/CM-2 linear motion cascade shakers
Desander
Desilter
Mud Cleaner	1 x Vortext Venture Model VV-VMH-468 with 3 x 4 inch hydrocyclones each
BOP	3 x Hydril 18¾ inch 15K compact double ram preventer; Vetco 18 3/4 inch 15K Super HD wellhead connector
LMRP	1 x Hydril 18¾in 10K Annuflex annular preventer; 1 x Vetco 18 3/4 inch 15K HAR H4 riser connector
Diverter	Vetco CSO 72 inch bore, 500 psi
Control System	Hydril multiplex control system.
Riser	134 x Vetco HMF 21 inch OD, 75ft joints with Class G couplings and 2 x 4 1/2 inch ID 15k CK lines
Riser Tensioners	6 x Hydralift 400 ST direct acting cylinders with 50 ft stroke or equivalent
Guideline Tensioners
Podline Tensioners
Choke & Kill	3 1/16 inch x 15K C&K Manifold H2S Service
Cementing	Third Party Equipment

Machinery

Main Power	6 x MAN B&W V32/40 14 cylinder engines rated 7,000 kW each, driving 6 x LDW-Siemens S5E 1250-10SE+wk generators rated 6,456 kW
Emergency Power	1 x MAN B&W 7L27/38 engine rated 2,310 kW driving 1 x Hyundai 2,100 kW 480V generator
Power Distribution	Siemens 11 kV switchboard feeding Siemens Blue variable speed drive, PWM type
Deck Cranes	4 x 100 MT electro-hydraulic knuckle-boom cranes, lift radius 7.8m to 45m
Thrusters	Used for propulsion; 6x Rolls Royce Aquamaster 7,000 HP fully azimuthing
Propulsion	6 x Siemens Siplink Thruster Drives driving 6 x LDW Siemens 5,500 kW A5L900S54-10KV=VK Thruster Motors

Mooring Equipment