Equinor and partners have booked 3.3–10.3 million boe of recoverable gas at the Gullfaks South field in the Norwegian North Sea, 190 km northwest of Bergen, with the Askeladden rig drilling the discovery as a sidetrack off a production well.

The find sits inside the production licence for Gullfaks, and the licence partners are unchanged from the parent field: operator Equinor, state holding company Petoro, and Austria's OMV. Same-licence ownership means no unitisation process or new licence award is required before any future tie-back can be sanctioned.

"It's very positive that it is possible to make discoveries of this size with such cost-effective exploration wells," said Gunnar Egge, Equinor's vice president for the Gullfaks field. "These will be profitable barrels that can help maintain activity and production on the Gullfaks field."

How big is the discovery?

Recoverable volumes are estimated at 0.5–1.6 million m³ of oil equivalents, a range wide enough to span the small-to-medium boundary on the Norwegian Continental Shelf. The upper end, at 10.3 MMboe, runs roughly three times the lower bound. Volumes in that band are typically uneconomic as a stand-alone project, but the in-licence location and proximity to existing Gullfaks processing change that calculation. A tie-back development can compress unit cost sharply compared with a stand-alone FPSO or fixed platform.

Why drill it as a sidetrack?

A production-sidetrack exploration well is drilled by deviating from an existing production wellbore at a chosen depth. The technique has become a standard tool for near-field exploration on the NCS, where the cost of a dedicated wildcat — rig mobilisation, standalone permitting, and longer drilling time — often outweighs the value of small in-licence prospects. By branching from an existing well path, the operator shares the rig slot and surface infrastructure with the producing field.

The Askeladden completed the well in connection with the parent production hole, which kept the incremental drilling cost low. Drilling a well of this kind in tandem with a production well avoids a separate rig campaign and shortens the cycle from spud to result.

What happens next?

Equinor has not announced a development concept, sanction date, or tie-back timetable. The next steps typically include reservoir evaluation, volumetrics refinement, and a tie-back study against existing Gullfaks processing and export capacity. Because the discovery sits inside the Gullfaks production licence, any development decision can be taken within the existing joint-venture framework rather than requiring a fresh licensing cycle.

Egge's framing of the find as barrels that "maintain activity and production" signals the operator is treating it as a satellite, not a stand-alone project. The watch item is the tie-back study outcome and whether recoverable volumes land at the upper end of the 0.5–1.6 million m³ range, which would improve project economics and shorten the path to first production.