Name: WilHunter
Flag: Vanuatu
Owner: WilHunter (Malta) Ltd.
Manager: Awilco Drilling PLC
Previous Name(s): Benreoch; Stena Forth; Glomar Arctic IV, GSF Arctic IV
Year Built: 1983
Builder: Daewoo Shipbuilding & Heavy Machinery Ltd, Korea;
upgraded:1999
Design: Friede & Goldman L-907 Enhanced Pacesetter
semi-submersible
Classification: DnV 1A1
MAIN DIMENSIONS
Length: 281ft bp; 221ft main deck
Breadth: 207ft overall; 203ft main deck
Depth: 116ft main deck; 150ft drill floor
Columns Corner: 4x38ft diameter; Middle: 2x35ft diameter
Pontoons: 2x270ft long
Deck Area: 40,461.5ft2
DRAFT AND DISPLACEMENT
Operating Draft: 65ft
Transit Draft: 24.5ft
Survival Draft: 50ft
Operating Displacement: 28421ton
Transit Displacement: 18062ton
MACHINERY
Main Power: 4xRuston 12-RKCZ diesel engine, 3320hp
Power Distribution: 6xHill Graham SCR unit, each rated at 1200amp;
2xdistribution transformer 1300/1600kVA, 600-480V
Emergency Power: 1xturbo Caterpillar 3512 diesel rated at 955kW
Propulsion: 2xin-line fixed propeller with nozzles, 1492bhp each
OPERATING PARAMETERS
Water Depth: 1500ft
Maximum Drilling Depth: 25000ft
Transit Speed: 5 knots
Survival Conditions: Wind: 100 knots; waves: 100ft
Drilling Conditions: Wind: 75 knots; max wave height: 50ft; current: 1.5 knots
Design Conditions: -20o C
DRILLING EQUIPMENT
Derrick: Derrick Services International 175x40x40ft: 1,400,000 lb
static hook load capacity with 14 lines
Drawworks: National Oilwell 1625-DE, 3000hp, driven by 3xUnirig
DM7661DC electric motor and with a Baylor 7838 auxiliary
electric brake
Rotary: National Oilwell C-495 with 49½ in opening, Unirig motor
driven
Top Drive: Maritime Hydraulics DDM-650, 570 ton, continous drilling
torque rating 40,400ft/lb, max rpm 265
Travelling Block: National 760-H650; rotary swivel: Wirth, 580 ton
Handling: BJ V-34-238FB 3-arm racking with power supply; Maritime
Hydraulics Iron Roughneck
Riser Tensioners: 8 x Brown Brother, 110,000lb, 50ft line travel
Guideline Tensioners: 4xBrown Brothers, 16,000lb, 40ft line travel
Motion Compensators: Brown Brothers in-line 600,000 lb compensating, 20ft stroke,
1,500,000 lb locked capacity; active heave compensator:
Maritime Hydraulics In Line, 17ft stroke
Cementing: Schlumberger remote operated
Mud Pumps: 2xNational Oilwell 12-P-160 1600hp; 1xContinental Emsco FB
1600 1600hp triplex, each driven by 2 x Unirig dc traction
motor, rated to 5000psi with plungers and hi-pressure liners
CAPACITIES
Variable Deck Load: 4017ton (8,998,000 lb)
Bulk Mud/Cement: 11400/11400ft3
Liquid Mud: 2235bbl
Drillwater: 8600bbl
Potable Water: 981bbl
Fuel Oil: 8600bbl
Others Base oil: 3424bbl; brine: 3245bbl
SUBSEA SYSTEMS
BOP: 2x 183/4 in Cameron D 10,000psi annular preventer; 2x183/4 in
Cameron U2 15,000psi double ram preventer; 183/4 in
x15,000psi Vetco Collet connector; LMRP: Cameron RD connector
BOP Handling: Normar 205.36 ton (230st) BOP elevator
Control System: Cameron hydraulic system with 2xsubsea hose
Riser Details: 1600ft x Cameron RD21 21in od
Diverter: Regan KFDS 24in nominal size diverter with Regan type DR-1 ball joint
Drillpipe: As required
Drillcollars: As required
Choke and Kill: 13/4 in 15,000psi, 1xadjustable, 2xhydraulic
MOORING
Winches: 4xSkagit WMD-48 double wildcat with dynamic disc brakes
Wire/Chain: 8x6300/6500ft x 3in diameter K-4 chain
Anchors: 8x26,500 lb Bruce TS
CRANAGE: 3 x National OS-435 hydraulic; 2x140ft boom, 43.5 ton (48.75st)
at 33ft; 1x80ft boom, 45.89 ton (51.4st) at 33ft
HELIDECK: 72ft x 88ft
MOONPOOL: 72ft x 23 ft
ACCOMMODATION: 110 berths
ADDITIONAL DATA: Solids control: 3xAxiom AX-1 shale shaker; 1x8in cone desilter,
piping and electrical hook-ups for one centrifuge
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