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    Seabed Worker completes offshore gravity monitoring survey for StatoilHydro

    Projects and Operations // October 1, 2009

    Seabed AS in Norway has successfully completed a contract to supply ROV and vessel services to Fugro Survey AS for the 2009 offshore gravity monitoring and subsidence surveys on the Troll, Sleipner, Midgard and Ormen Lange fields. The survey was conducted from Seabed's new vessel, Seabed Worker, and the end client was StatoilHydro.

    Completion of the work involved taking 513 gravity measurements on pre-installed benchmarks using the ROV Deep Ocean Gravimeter (ROVDOG) instrument package. 

    During the 28 day campaign the system performed 272 dives with over 500 hours in the water while accumulating only 0.4 per cent downtime.

    The combination of the vessel's Voith Scheider propulsion system and ODIM LARS active heave compensated launch and recovery system contributed to the success of these operations in sea conditions of up to 4m significant wave heights, where both minimising time between measurements and care in handling of the ROVDOG contributed to the quality of data acquired.

    “The survey was a great success because the pilots all took the job seriously, they listened carefully to our requirements, and then they worked diligently to meet those requirements. They were willing to collaborate with us to obtain high quality measurements,” said Mark Zumberge, Research Geophysicist, Scripps Institution of Oceanography and Scripps team leader onboard Seabed Worker.

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