Equinor Makes Discovery in Svalin Field Offshore Norway – Rigzone News

Equinor ASA has unlocked a discovery in the Svalin field on the Norwegian side of the North Sea, the Norwegian Offshore Directorate said Thursday.

Well 25/11-H-1 H yielded between 0 and 0.1 million standard cubic meters [3.5 million cubic feet]of recoverable oil equivalent, which is the equivalent of between 0 and 0.6 million barrels, the directorate said in a press release. The well was drilled by Odfjell Drilling Ltds Deepsea Aberdeen rig.

The development well showed thin sandstone layers with very good reservoir quality in the Balder Formation, which is part of the Rogaland Group. The oil in the Balder Formation is presumed to be in pressure communication with surrounding reservoir sands in the Heimdal Formation on the Svalin C structure, the directorate said. The oil/water contact was not encountered.

The licensees will consider whether the discovery is sufficiently profitable for production, the director said.

Svalin, which contains the discovery, is a producing field with two structures: Svalin C and Svalin M. Svalin C is tied back to the Grane installation, which also serves the Grane and Breidablikk fields, through a subsea template while Svalin M uses a multi-branch well drilled from Grane.

Svalin, in the central part of the North Sea, was proven 1992 and put onstream March 2014.

The field, operated by Norways majority state-owned Equinor with a 57 percent stake, produced 49,000 cubic meters (1.7 million cubic feet) of oil equivalent last year, according to government website Norskpetroleum.no. The other partners are Petoro AS with a 30 percent interest and Var Energi ASA with 13 percent.

Earlier this year Equinor confirmed oil and gas in the Heisenberg discovery in the North Sea through wells 35/10-11 S and A. Preliminary data indicated that the size of the discovery was 3.8 million to 8.9 million cubic meters (134.2 million to 314.3 million cubic feet of oil equivalent), according to a press release by the Norwegian Offshore Directorate March 21.

In the same drilling campaign, Equinor also proved oil in the Hummer prospect. Hummer and Heisenberg are under production license 827 SB.

Preliminary calculations placed the size of Hummer at 100,000 to 600,000 million cubic meters (3.5 million to 21.2 million cubic feet), the directorate said at the time.

The primary exploration target for well 35/10-11 S was to delineate the Heisenberg discovery made in 35/10-9 in the lower Hordaland Group in the Eocene, the directorate said. The secondary exploration target was the Hummer prospect in the Balder Formation in the upper Palaeocene to lower Eocene.

Since 35/10-11 S encountered the primary target in the water zone, the 35/10-11 A sidetrack was drilled with the primary target of encountering Heisenberg upflank in the oil zone.

Well 35/10-11 S encountered a 10-meter (32.8 feet) sandstone reservoir of good quality in the Hordaland Group.

In the secondary exploration target in the Balder Formation, the well encountered a 3-meter [9.8 feet]oil column in sandstone totaling 23 meters [75.5 feet] with poor to moderate reservoir quality, the directorate added.

Meanwhile well 35/10-11 A encountered a 12-meter (39.4 feet) sandstone reservoir with moderate to good quality in the Hordaland Group according to the directorate.

To contact the author, email jov.onsat@rigzone.com

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Equinor Makes Discovery in Svalin Field Offshore Norway - Rigzone News