The well was drilled about 55 km south of the Troll field in the North Sea and 100 km 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 m thick, of which 48 m were sandstone with moderate reservoir quality. In the upper part of the Statfjord Group, the well encountered 28 m of sandstone with moderate reservoir quality.
In the secondary target, the well encountered the Sognefjord Formation with a thickness of about 275 m, of which 65 m were sandstone of moderate to good reservoir quality. It also encountered the Fensfjord Formation, about 130 m thick, of which 47 m 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 m 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 m. 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.
Read the latest issue of Oilfield Technology in full for free: Issue 2 2021
Oilfield Technology’s second issue of 2021 starts with a report from KPMG that examines the outlook for the Scottish oil and gas sector. The rest of the issue is dedicated to articles covering the offshore supply chain industry, offshore asset integrity, expandable liner technology, advances in drilling, data security, flow control, EOR and methane emissions.
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