outstanding performance through design excellence
- DrillMAX series unique in-house design
- Designed for safe operations with a hydraulic lifting package
- Designed to maximise efficiency of exploration and development campaigns
All four drill ships have NOV Dual Hoisting and Drilling Towers, rated to 2,000,000 lbs (upgradable to 2,500,000 lbs) for the Main Well and 1,200,000 lbs for the Aux. Well. This configuration allows for simultaneous drilling, tripping, casing running, cementing or riser running amongst various other possibilities. This cylinder ram-rig lifting system removes the need for time consuming slip-and-cut operations.
Tubular Handling System
A setback area located adjacently to the drill floor can accommodate trebles of Range-3 or quadruples of Range-2 tubulars ranging from 3½” to 13⅝” OD. Two NOV Hydrarackers transport stands from setback area to either well centre to the setback area, along with the offline stand build activity centre. Up to 35,000 ft of drill pipe, Heavy weight drill pipe and drill collars can be racked. Up to 80 stands of casing can also be racked.
The technologically advanced Cyberbase control system allows for remote control of multiple drilling systems and pieces of equipment directly from the driller’s cabin. This includes many automated pieces of machinery reducing personnel exposure to drill floor operations, improving both operational efficiency and safety across the fleet.
Power Management System
A sophisticated Power Management System on board each vessel ensures sufficient power is available at all times. This system controls load sharing across the multiple generators on board and distributes power across each vessel for station keeping, drilling system, and other ship systems; ultimately providing blackout protection.
All drill ships have a heave compensation system that is a fully hydraulic, multiple lift cylinder design utilising a unique active and passive dead line compensator (DLC). This is rated to 1,264,600 lbs/472 MT (upgradable to 2,500,000 lbs/1134 MT) on the Main Well. The Aux. Well is rated to 840,000 lbs/381 MT.
HP Mud System
Each drill ship is equipped with four National Oilwell FC-2200 mud pumps all equipped with quick change fluid end part replacements. HP mud system is rated to 7,500 psi.
Riser & Tensioning System
Drill ships are designed for operations in water depths of up to 10,000 feet (upgradeable to 12,000 feet). A Cameron LoadKing 3.5 riser system of 80 ft joints is installed on each drillship. The riser tensioner system consists of an DAT NOV N-Line tensioner system.
A Kongsberg K-POS 32 dynamic positioning system ensures that vessels maintain position by manipulating the six azimuth thrusters. Position data is continuously fed from a hydro acoustic position reference system, as well as a differential global positioning system.
Well Control Equipment
DrillMAX series vessels are outfitted with 2 x 15,000 psi Cameron BOP stacks each with 6 ram cavities. Multiple BOP stacks allows for greatly improved efficiency between consecutive wells. Riser joints are handled by a dedicated riser gantry crane located aft of the drill floor. This crane feeds the riser catwalk feeding directly into the drill floor.
Mud Return System
Five NOV 300 VSM shale shakers separate cuttings from mud returns, along with various degassers, desilters and mud re-conditioning systems before mud is transferred back to the pits (System is Upgradable to a Dual Mud System).
Cranes & Handling Systems
Multiple NOV Knuckle Boom Cranes are fitted to Stena drill ships for cargo and tubular handling across each vessel. A pipe handling crane located centrally within the pipe deck of each drillship allows for handling of drilling assemblies to and from the drill floor, along with casing and wellhead tools. Riser joints are handled by a dedicated riser gantry crane located aft of the drill floor. This crane feeds the riser catwalk feeding directly into the drill floor.
Stena DrillMAX vessels can accommodate up to 180 persons (upgradable to 220 persons) on board in one and two berth cabins. Also contained within the accommodation block are the bridge, various offices and meeting rooms, fully equipped ship’s hospital, along with the galley, laundry, 3 gyms and other recreational areas.
Check the specifications of our Drillships below
The Stena Carron is a Harsh Environment dynamically positioned DP Class 3 drillship capable of drilling in water depths up to 10,000ft. The Stena Carron has on-board 2 x BOP’s, each 18¾” x 15,000psi Cameron “TL” BOP c/w ST Locks, and uses Cameron Load King riser.
The Stena DrillMAX is a Harsh Environment dynamically positioned DP Class 3 drillship capable of drilling in water depths up to 10,000ft. The Stena DrillMAX has on-board 2 x BOP’s, each 18¾” x 15,000psi Cameron “TL” BOP c/w ST Locks, and uses Cameron Load King riser.
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.
Stena IceMAX is the world’s first dynamically positioned, dual mast ice-class drillship. The Stena IceMAX is a Harsh Environment DP Class 3 drillship capable of drilling in water depths up to 10, 000ft. The IceMAX has on-board 2 x BOP’s, each 18¾” x 15,000psi Cameron “TL” BOP c/w ST Locks, and uses Cameron Load King riser.