Light intervention vessel perforates North Sea wells

The light well-intervention vessel CSO Seawell re-entered and reperforated two active subsea water-injection wells in Statoil's Heidrun field, offshore Norway. Coflexip Stena Offshore Norge AS, operator of the vessel, says one of the wells re-entered at Heidrun was in 340-m water, which is 150 m greater than the previous record for such an intervention.

In addition, it says this was the longest and most deviated well ever re-entered by CSO Seawell using tools deployed on wireline. One well, with a measured depth of 5,657 m, had a 79degrees deviated section and access into this well was made possible with an electric wireline well tractor, which, it says, physically drove the perforating tool to the bottom of the well.