StatoilHydro has brought the Tune South satellite well on stream. The first gas flowed on 18 July.
The satellite is tied back to the Oseberg field centre via the Tune subsea template.
"Output from Tune South is expected to be 1.4 million cubic metres of gas per day," senior vice-president of the company's operations west business cluster Torstein Hole said in a statement.
"In its first year of production Tune South will account for 10% of the gas exported from the Oseberg field centre," he added.
Tune South is developed as a satellite well tied back to the Tune subsea template, 10km south-west of the Oseberg field centre in the North Sea.
Tune South “utilises free capacity in the existing infrastructure of the Oseberg area” to make maximum use of the resources in the area, Hole added.
Tune South is part of the Tune field and lies mainly in PL 190.
The licencees are operator StatoilHydro with 50%, Petoro with 40% and Total with the remaining 10%.