Aker Yards has signed a contract worth approximately NOK 650 million to build a
Well Intervention Vessel for Island Offshore. The vessel will be delivered in January 2008.
Main duties for the new vessel of Rolls Royce design, will be maintenance and repair of oil-/gaswells in deeps of as far as 600 meters, and operate with a riserless wireline intervention system. The vessel will operate an ROV, (remote operated vehicle), for operations on the sea bed. The sub sea related equipment will be provided by FMC and Aker Kvaerner Wellservice.
Island Offshore has been assigned a contract by Statoil for well intervention services on the Norwegian continental shelf. Under the contract Island Offshore will use its pioneering light well intervention vessel Island Frontier, built by Aker Yards, as forerunner in 2006-07. The new vessel, to be named Island Wellserver, is a new Rolls-Royce design (UT 767 CD), and will take over the service from April 2008.
Vessel type UT 767 CD, Subsea Riserless Well Intervention Vessel
Contract value Approx. NOK 650 million
Yard Aker Yards, Langsten
Delivery time January 2008
Length and width 116 meters long, 25 meters wide
Dieselelectric propulsion 4 off main generator sets, 1 off auxilary generator set, total effect approx. 13 000 kW
Main propellers Electrical driven azimuth main propellers 2 x 3500 kW
Classes DNV, Dynpos AUTRO, Comfort (1), Clean Design
Deadweight 8 200 tons
Accomodation For 95 persons
Design Rolls-Royce Marine
For further information, please contact:
Tore Langballe, SVP Corporate Communications and IR, Aker Yards ASA +47 24 13 01 30
Magne Håberg, SVP Offshore & Specialized Vessels +47 91 51 02 31
Håvard Ulstein, Managing Director, Island Offshore +47 70 00 97 50
Aker Yards ASA is an international shipbuilding group focusing on sophisticated vessels and is one of the world's five largest shipbuilders. The group has a strong position both in terms of innovation, product range, technology, experience and capacity. The product range includes cruise vessels and ferries, merchant vessels, offshore and specialized vessels. Aker Yards, with a turnover of NOK 12.5 bn. in 2004, comprises 13 yards in Norway, Finland, Germany, Romania and Brazil, and has approximately 13.000 employees. www.akeryards.com
Intervention services envisaged include production logging, plugging and gauging operations, perforation and re-perforation and downhole mechanical work. The vessel will also carry out ROV operations. Working on live wells means that the ship has to comply with very strict regulations. It will be built to the Ship-Shaped Well Intervention Unit class rules of DNV with dynamic positioning to DYNPOS-AUTRO standard. Island Offshore is also specifying Clean Design class and Comfort V(1)C(1) class. Depending on the type of interventions, the vessel has to be able to carry them out in up to 4m or 6m significant wave heights, to launch and retrieve ROVs in up to 4m significant wave height, and to stay on location itself in standby mode in environmental conditions corresponding to Beaufort 9 prior to disconnecting from the well.
To meet this difficult brief, UT-Design has developed a 116m long, 25m beam, vessel with a large freeboard to give the required stability, low motions and freedom from spray and green water on deck. The deck will be dominated by the module handling tower and a large working deck area has been specified so that containerised tanks and equipment can be carried. A large crane will be installed to give heavy sub sea lifting capability and there will be an area of low freeboard aft to facilitate lifting equipment over the stern. Two Oceaneering ROVs will be carried in hangars, one either side of the vessel. The oil related equipment will be provided by Kongsberg and FMC.
A dynamic positioning requirement corresponding to IMO DP3 has a major impact on the propulsion system. Island Offshore has specified a diesel electric propulsion system with azimuth thrusters for main propulsion. Electrical power will be generated by four Bergen gensets of two different sizes to give maximum operating flexibility. Two Ulstein Aquamaster Azipull thrusters with pulling propellers will provide the main propulsion and manoeuvring forces, backed up by two Supersilent tunnel thrusters, and a swing-up azimuth thruster under the bow which will be powered by its own independent diesel engine.
One result of the extremely stiff regulations applied by the Norwegian Petroleum Department to this type of vessel is that two freefall lifeboats have to be provided on each side of the vessel. The need to get adequate launching height for these heavy craft imposes severe stability criteria on the mother ship.
Well intervention and ROV operations imply a much larger crew than is necessary for navigating the ship so accommodation will be provided for 95 people in single staterooms. Island Frontier achieved very low noise levels and Island Wellserver is designed to be even quieter, while its Clean Design notation stipulates a minimum impact on the environment.