31/11-1 S

General

Well 31/11-1 S was drilled to test the Stovegolvet prospect in the central part of the Stord Basin in the North Sea in North Sea. The primary objective was to test the hydrocarbon potential in the Early Jurassic Johansen Formation. The secondary objective was to test the Sognefjord, Fensfjord and Krossfjord formation in the Late Jurassic Viking Group.

Operations and results

A 9 7/8’’ pilot hole was drilled to 820m MD to check for shallow gas. No shallow gas or shallow water flow was

observed. Wildcat well 31/11-1 S was spudded with the semi-submersible installation Deepsea Atlantic on 20 April 2021 and drilled to TD at 3284 m (3165 m TVD) m in the Late Triassic Lunde Formation. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 820 m, with Carbosea oil-based mud from 820 m to 2273 m, and with water-based Perflow CM mud from 2273 m to TD.

The Viking group was encountered at 2191 m (2158 m TVD) with a 112 m TVD thick high gamma ray Draupne Formation on top. Below was the Heather formation with intercalated Sognefjord, Fensfjord and Krossfjord sands with moderate to good reservoir properties. A 63 m TVD thick Brent Group, Rannoch Formation, was penetrated between the Viking Group and top Dunlin Group with top at 2827 m (2744 m TVD). A 63 m TVD thick Johansen Formation with moderate reservoir properties was encountered at 2929 m (2839 m TVD). No high gas readings observed in any of the sections. Gas readings were far below 1% in all sections. The highest gas readings recorded was 0.54% in the Heather Formation. No oil shows were seen.

No cores were cut. No fluid sample was