Equinor and its partners have discovered an estimated 3.3 million to 10.3 million barrels of recoverable oil equivalent in gas at Norway’s Gullfaks South field, using an exploration sidetrack drilled during work on a production well.
The discovery, announced on October 8, highlights the role of targeted exploration in sustaining production from mature North Sea assets. Its commercial appeal lies in finding additional resources through drilling linked to an existing production campaign.
Located about 190 kilometers northwest of Bergen, the find contains an estimated 0.5 million to 1.6 million standard cubic meters of recoverable oil equivalent, according to Equinor.
The Askeladden rig drilled the exploration well, formally designated 34/10-D-4 BH. The discovery lies within the Gullfaks production license, with Equinor, Petoro and OMV as partners.
Gunnar Egge, Equinor’s vice president for the Gullfaks field, said discoveries of this size could be made through cost-effective exploration wells. He described the resources as “profitable barrels that can help maintain activity and production on the Gullfaks field.”
That assessment captures the importance of smaller discoveries in established producing areas. Their value depends on development costs and access to production facilities as well as resource size. A sidetrack drilled alongside a production well can reduce the scope of a separate exploration campaign, although the cost of bringing the discovery into production remains a separate consideration.
Equinor did not disclose a development cost, production start date or expected output rate in the announcement.
For mature fields, smaller discoveries can help offset declining output and extend the useful life of existing infrastructure. Where new resources can be developed through nearby wells and processing facilities, they may be commercially attractive at volumes that would not justify a standalone project. Their cumulative contribution can help sustain production long after a field’s original reservoirs have passed their peak.
At Gullfaks, Equinor sees the new volumes as a profitable addition that can help sustain activity and production. The announcement leaves the development schedule open, but the discovery adds another option for maintaining output from the area.
By Jan-Thore Bergsagel for Oilprice.com
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