text: Well repairs to lift Heidrun oil output - Statoil . OSLO 1996-08-22 Three plugged water injection wells on the Heidrun oilfield off mid-Norway will be reopened over the next month , operator Den Norske Stats Oljeselskap AS ( Statoil ) said on Thursday . The plugged wells have accounted for a dip of 30,000 barrels per day ( bpd ) in Heidrun output to roughly 220,000 bpd , according to the company 's Status Weekly newsletter . The wells will be reperforated and gravel will be pumped into the reservoir through one of the wells to avoid plugging problems in the future , it said . -- Oslo newsroom +47 22 42 50 41