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    CSO extends well intervention capability

    Company News // November 20, 2000
    Coflexip Stena Offshore (CSO) has announced that its Norwegian subsidiary Coflexip Stena Offshore Norge AS has successfully completed a challenging contract for Statoil to enhance production from its Heidrun field, located on the Haltenbanken, offshore Norway.

    The specialist light well intervention vessel CSO Seawell was used to re-enter two active subsea water injection wells in the south and west sectors of the field, and to increase their effectiveness by perforating new injection paths into the reservoir.Increasing the injection rate of water into the reservoir helps to drive the oil towards the Heidrun platform, where it can be produced to surface.

    The successful completion of this challenging contract at Heidrun marks another milestone for light subsea well intervention vessels such as CSO Seawell. One of the wells re-entered at Heidrun was located in 340m water depth. This water depth is 150m greater than the previous record for such intervention techniques. In addition, the well itself measured 5657m deep with a highly deviated section angled up to 79( from the vertical.Access into this well was made possible by using an electric wireline Well Tractor(r), which physically drove the perforating tool to the bottom of the well.

    Knut BÝ, Managing Director of Coflexip Stena Offshore Norge AS, added: "We predicted a bright future for light subsea well intervention in Norway after the CSO Seawell proved its capabilities to STATOIL on the Tommeliten contract earlier this year."This recent success in the Heidrun field consolidates our belief that CSO Seawell can effectively intervene on subsea wells throughout the Norwegian continental shelf. This coverage now includes arduous areas such as the Haltenbanken, where the increased water depth, harsh environment and deviated wells has previously restricted the application of such cost effective technology."

    CSO has also announced that one of its GOM-based subsidiaries Coflexip Stena Offshore Inc (CSOI), will build a rigid pipe spoolbase at Mobile, Alabama, to support its offshore pipelay and construction work with the CSO Deep Blue and CSO Apache in the Gulf of Mexico. The base is situated on a 130 acre site for which CSOI has secured a long term lease.

    This $10 million investment involves a deepwater dock, access roads, rail access, storage areas and infrastructure for high specification pipe welding, preparation and loading.

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