Dry well near the Troll field in the North Sea – 31/11-1 S


Illustration image.

07/07/2021 Equinor Energy AS, operator of production licence 785 S, has concluded the drilling of wildcat well 31/11-1 S.

The well was drilled about 55 kilometres south of the Troll field in the North Sea and 100 kilometres southwest of Bergen.

The primary exploration target for the well was to prove petroleum in the Johansen Formation from the Early Jurassic and the Statfjord Group from the Late Triassic to Early Jurassic.

The secondary exploration target for the well was to prove petroleum and investigate the reservoir properties in the Sognefjord Formation, the Fensfjord Formation and the Brent Group (Late to Middle Jurassic) and to investigate the source rock potential in this part of the Stord Basin. Another objective of the well was to evaluate reservoir properties with regard to storing CO2.

The well encountered the Johansen Formation, about 65 metres thick, of which 48 metres were sandstone with moderate reservoir quality. In the upper part of the Statfjord Group, the well encountered 28 metres of sandstone with moderate reservoir quality.

In the secondary target, the well encountered the Sognefjord Formation with a thickness of about 275 metres, of which 65 metres were sandstone of moderate to good reservoir quality. It also encountered the Fensfjord Formation, about 130 metres thick, of which 47 metres were sandstone with moderate to good reservoir quality. The Brent Group was not encountered.

The well is dry. Data acquisition has been performed.

This is the first exploration well in production licence 785 S. The licence was awarded in APA2014.

Well 31/11-1 S was drilled to respective measured and vertical depths of 3254 and 3135 metres below sea level and was terminated in the lower part of the Statfjord Group from the Early Jurassic to Late Triassic.

Water depth at the site is 289 metres. The well has been permanently plugged and abandoned.

Well 31/11-1 S was drilled by the Deepsea Atlantic drilling facility, which will now drill production well 34/7-J4 AH on the Tordis field in production licence 089 in the North Sea, where Equinor Energy AS is the operator.

Map of well 31-11-1-S



Ola Anders Skauby

Director Communication, public affairs and emergency response

Tel: +47 905 98 519

Updated: 07/07/2021

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