Stena MidMax

Stena MidMax is a dynamically positioned (imo class 3), harsh environment semi- submersible drilling, completion and workover vessel for worldwide operations, including UK and Norway.
Stena MidMAX has a capability for a water depth from 80m to 2000m using a 18 3⁄4” 15,000psi WP Cameron “TL” BOP and Cameron 21” riser.

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Vessel Specifications

General Information
Rig Type Column Stabilized Drilling Unit
Design Moss Maritime CS60E
Construction Yard Samsung Heavy Industries
Year Delivered March 2016
Classification DNV+1A1 Column Stabilized Drilling Unit(N); DRILL(N), DYNPOS AUTRO, CRANE(N), CLEAN, F-AM, POSMOOR-ATA, E0, HELDK-SH, RECYCLABLE, ICE- T(1A), BIS
Flag Bermuda
Station Keeping IMO DP Class 3 + POSMOOR-ATA
Max Water Depth 2000m / 6,562ft
Max Drilling Depth 10,750m / 35,270ft
Helideck Rated for S-92 & EH101
Accommodation 150 Persons
Drilling Equipment
Mast NOV, 2.5mlbs / 1134Mt capacity
Hoist/Drawworks NOV Dual Active Heave, 1,400sT lift capacity each.
Motion Compensator Dual Active Heave Compensating Drawworks
Top Drive NOV TDX-1250
Pipe Handling 2 Off HR-IV Hydra Rackers
Offline Stand Build Fitted
Mud Pumps 4 x NOV FC2200
Shale Shakers 6 x NOV Triple Deck
Mud Pumps 3 x National 12-P-160
Shale Shakers 4 x Brandt – VSM 300
Liquid Mud 960m3 on deck; 1710m3 Pontoon
Drill Water 1,980m3
Potable Water 1240m3
Fuel Oil 4,780m3
Bulk  Cmt/Mud 8 x 79m3(net) Tanks
Base Oil 855m3
Brine 820m3
Sack Material 5,600 Sacks
Dimensions / Loading
Length 87.04m
Breadth 77.76m
Moonpool 27.6m x 9m
Operating Draft 23.5m
Transit Draft 11.1m
VDL (Operating) 7,000 Mt
Well Control Equipment
BOP 5 Ram,18 ¾” x 15KSI Cameron TL BOP
Annulars 10 KSI Dual DL Assembly
Wellhead Connector Cameron 27” EVO, 18 ¾”, 15K
Control System MUX
Riser Cameron 21”, LK 3.5, 80 feet
Riser Tensioners 4 Off Dual Tensioners, 2 x 280KIP Each
Choke & Kill Manifold Cameron 3 1/16” – 15KSI
Diverter 21 ¼" inch, 500 psi, for 60.5 inch Rotary Table, w/ 16” Flowlines
Diverter Regan– KFDS – CSO – 49 ½"
Machinery/Hoisting/Station Keeping Equipment
Main Power 6 x Wärtsilä Diesels, 7.4MW Each
Emergency Power Included above
DP System Kongsberg DP3
Thrusters 6 x Rolls Royce UUC445, 5.5MW Each
Mooring system 4 x Double Windlass w/ 8 x R5 Chains, 2,600m Each
Deck Cranes 2 x NOV KBC Cranes, 100t SWL
Riser Crane 1 x NOV Gantry Crane, 2 x 27.5t 1 x NOV KBC CRANE, 30t
BOP Handling 1 x NOV Gantry Crane, 2 x 275t 810t BOP/XT Trolley
Pipe Handling 1 x NOV Pipe Gantry Crane, 2x 7.5t