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Equinor and partners discover oil near Troll field

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Oilfield Technology,

Equinor and partners DNO Norge, Petoro and Wellesley Petroleum have struck gas and oil in production licence 923.

Recoverable resources are estimated at between 7 and 11 million m3 of oil equivalent, corresponding to 44 – 69 million boe.

The Røver North discovery adds to a number of discoveries in the Troll/Fram area in recent years.

The Blasto and Apodida prospects in production licence 090 will be drilled after Røver Nord.

Exploration well 31/1-2 S and appraisal well 31/1-2 A in production licence 923 were drilled some 10 km northwest of the Troll field, 18 km southwest of the Fram field and 130 km northwest of Bergen.

The primary exploration target for exploration well 31/1-2 S was to prove petroleum in the Brent group from the Middle Jurassic period and in the Cook formation from the Early Jurassic period. The purpose of 31/1-2 A was to delineate the discovery made in the Brent Group in well 31/1-2 S.

Both wells proved hydrocarbons in two intervals in the Brent Group. Well 31/1-2 S encountered an about 145-m gas column in the Brent Group (Etive and Oseberg formations) and a 24-m oil column where the oil/water contact was not encountered. A total of 50 m of effective sandstone reservoir with good reservoir quality was found in this interval. In addition 6 m of oil-bearing sandstone with moderate to poor reservoir quality was struck in the upper part of the Dunlin Group.

Appraisal well 31/1-2 A struck sandstones with good to moderate reservoir quality in the Etive formation and upper part of the Oseberg formation. The lower part of the Oseberg formation contained sandstone with moderate to poor reservoir quality. An estimated total of 41 m of effective sandstone reservoir was found in the two formations. The well proved 12 m of oil in the Etive formation, where the oil/water contact was not encountered, and a 17-m oil column in the Oseberg formation.

The Cook formation proved to be water-filled in both wells, but with moderate to good reservoir quality. The wells were not formation tested, but extensive data acquisition and sampling took place.

The licensees consider the discovery commercial, and will explore development solutions in towards existing infrastructure.

The wells are the 1st and 2nd exploration wells in production licence 923. The licence was awarded by the Government in 2018 through the “Awards in Pre-defined Areas 2017” (APA) licensing round.

Well 31/1-2 S was drilled to a vertical depth of 3439.5 m below sea level and a measured depth of 3555 m. The well was terminated in the Amundsen formation from the Early Jurassic period. Well 31/1-2 A was drilled to a vertical dept of 3452 metres below sea level and a measured depth of 3876 metres. The well was terminated in the Cook formation.

The water depth at the site is 349 m. The well has been permanently plugged and abandoned. The wells were drilled by the West Hercules drilling rig, which will now drill exploration well 31/2-22 S in production licence 090 in the northern North Sea.

Read the latest issue of Oilfield Technology in full for free: Oilfield Technology's November/December 2020 issue

The November/December issue of Oilfield Technology begins by reviewing the state of the North Sea before moving on to cover a range of topics, including Drilling Technologies, Deepwater Operations, Flow Control.

Contributors come from Varel Energy Solutions, Gyrodata, Clariant Oil Services, Drillmec and many more.

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