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    CSO breaks new ground on Tommeliten abandonment

    News // June 16, 2000
    Coflexip Stena Offshore Norge, part of Coflexip Stena Offshore (CSO), has been awarded a contract by Statoil for the abandonment of its Tommeliten subsea field, offshore Norway.

    The award is a significant milestone in the introduction of light well intervention services on the Norwegian continental shelf, and is the first time that the Norwegian authorities have given consent for a light well intervention vessel to do work in alive well.

    It is also the first time that such work will be undertaken by avessel in the North Sea, without the support of divers.

    The Tommeliten field was developed with six subsea trees on a singletemplate in 73m of water. It was the first subsea field to be developed by Statoil, and produced for ten years until shut down in 1998.

    The scope of work for the project includes the re-entry of all six subsea trees using the CSO Seawell, the light well intervention vessel.

    The CSO Seawell will isolate the reservoir using cement and mechanical plugs set inside the well, up to 3,000m below the seabed. Once the wells are secured, the Christmas trees will be recovered from theseabed by the CSO Seawell.

    In addition to supply of the CSO Seawell, the contract also calls for CSO to supply all well engineering and downhole services and consumables required to execute the work.

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