Stena Forth is a harsh environment, dynamically positioned DP Class 3 drillship capable of drilling in water depths up to 10,000’ using 18 3⁄4” – 15,000psi Cameron TL BOP and Cameron Load King Riser.

General Information

Rig TypeDynamically Positioned Drillship
DesignMono-hull Drillship
Construction YardSamsung Heavy Industries
Year Delivered2009
ClassificationDNV: + 1A1 Ship-shaped Drilling Unit (N) HELDK-SH CRANE E0 F-AM DYNPOS-AUTRO DRILL(N)
Station KeepingDP Class 3, Kongsberg K-POS 32
Max Water Depth10,000ft (upgradable to 12,000 ft)
Max Drilling Depth35,000ft (upgradable to 40,000 ft)
Helideck Designed for Sikorsky S92 & EH-101
Accommodation180 persons (upgradable to 220 persons)

Dimensions/ Loading

Moonpool25.6m x 12.48m
Operating Draft12m
Transit Draft8.5m
VDL (Operating)20,000 Mt @ 12m

Drilling Equipment

Mast/DerrickNOV Dual Hoisting and Drilling Tower
Hoist/Drawworks907 Mt (Main), 544 Mt (Aux)
Motion CompensatorActive & Passive (Main Well): 1,040,000 lbs/472 MT (Upgradable to 2,500,000 lbs)
Active & Passive (Aux Well): 840,000 lbs/381 MT
Top DriveMain Well: NOV HPS 1000 (Upgradable to 1250T Topdrive)
Aux Well: NOV HPS 750
Pipe HandlingNOV Dual Hydra - Racker 3 ½” to 13 ⅝”
Offline Stand Build1 x Off Line Stand Build + Torque Master
Mud Pumps4 x National FC2200 – 7500psi
Shale Shakers5 x NOV – VSM 300

Well Control Equipment

BOP18 ¾” x 15K Cameron TL with CDVS & CSR, Spare DVS (5 Ram) & Cameron DL Annular 10k
Annulars1 x Hydril GX Annular 10k + 1 x Cameron HC Connector (10K)
Wellhead Connector1 x 18 ¾ GE Vetco H4-SHD
Control SystemCameron MUX (BOP Fluid recovery sys)
Riser7,500’ Cameron LoadKing 3.5 (80’ Joints)
Riser Tensioners6 x N-Line tensioner system 2,500 Kips
Choke & Kill ManifoldCameron 3 1/16” – 15K
DiverterGE Vetco KFDS CSO 500 – 60 ½” – 500psi


Liquid Mud Active: 1004m³
Storage: 2345m³
Waste: 502m³
Drill Water4464m³
Potable Water 2052m³
Fuel Oil10,805m³
Bulk Cmt420m³
Base Oil490m³
Sack Material7,500 sacks

Machinery/ Hoisting/ Station Keeping Equipment

Main Power6 x Genset: Wartsila 16V32
Generator Rated Output: 9312kVA
Emergency PowerIntegrated in main power
DP SystemDP 3 (Kongsberg) :2 x HiPaP, 3x DGPS, HAIN, 2 x LTW
Thrusters6 x RR UUC -455, 5.5MW
Mooring system2 x 12.675 Mt Anchors
Deck Cranes3 x NOV KBC each rated for 85t/34t/17t. 1 x NOV Pipe handling KBC rated for 7.0t/3.5t.
Riser CraneNOV Gantry Crane – 2x20Mt
BOP Handling350Mt Moonpool Skid 2 x 175Mt BOP Overhead Crane