The Stena Clyde is a semi-submersible, twin pontoon, column stabilised drilling unit, Aker H3 design. The vessel has been modified with an additional six stability columns to provide adequate operating deck load for operations in 1,640ft water depths. A Cameron TL 18¾”15,000 WP H2S Service BOP is fitted. The Stena Clyde has an SBOP capability for a water depth of 5,000 ft.

General Information

Rig TypeSemi Submersible
DesignAKER H-3
Construction YardRauma Rupola
Year Delivered1976 - Modified 1985 (1997)
Classification+1A1 Column Stabilised Unit UKVS
Station Keeping4630ft chain ORQ R3 3inch. Anchors:
3 x 15T Viking 5 x 7T Stevpris
Max Water Depth1,640ft (5,000 ‘ SBOP / pre-laid moorings)
Max Drilling Depth25, 000ft
HelideckArranged for Eurocopter 225 – 11Ts
Accommodation105 persons

Dimensions/ Loading

Moonpool15.9 m x 6 m
Operating Draft21.34m
Transit Draft9.4m
VDL (Operating)3,150 tonnes

Drilling Equipment

Mast/DerrickPyramid Dynamic Beam leg (40ft x40ft base) 545mt
Hoist/Drawworks3000 HP National 1625 DE
Motion CompensatorHydralift CMC
600,000 lbs 25ft stroke.
Top DriveAker (MH) DDM-650-DC
Offline Stand BuildN/A
Mud Pumps3 x National 12-P – 160 1600 HP
Shale Shakers4 x VSM300

Well Control Equipment

BOPCameron TL 18¾” 15,000 WP
LMRPCameron 18¾ 10,000k
Wellhead Connector18 ¾” Cameron HCH4, 15k.
Control SystemShaffer/Cameron
Riser26 x 65 ft Joints Cameron ‘RF’
Riser Tensioners10 x NL Shaffer 80K
Choke & Kill Manifold Cameron 3 1/16 x 15k, 4 1/16 x 10k
DiverterRegan KFDS-3, nominal 24”


Liquid Mud2750bbl
Drill Water1170 tonnes
Potable Water 1160 tonnes
Fuel Oil1230m³
Bulk Cmt402 tonnes
Base Oil320 tonnes
Sack Material2000 Sacks

Machinery/ Hoisting/ Station Keeping Equipment

Main Power5 x Caterpillar 3516 CHD Generator Rated Output: 2550kVA
Emergency Power1 x Caterpillar 3508B, 850kW Generator Rated Output: 1062kVA
DP SystemN/A
Mooring system4 Double Pusnes type 75-EA
Deck Cranes2 x National OS435 diesel hydraulic
Riser CraneN/A
BOP Handling1 Hydralift BOP transporter 230 tonnes SWL

Fleet Availability

■ Hot Stacked | ■ Operational