6611/1-1

General

Well 6611/1-1 was drilled to test the Toutatis prospect on the Grønøy High in the Norwegian Sea. The primary objective was to test the hydrocarbon potential in the Tilje and Åre formations.

Operations and results

Operations started on 31 October 2019 with drilling of a 9 7/8" shallow gas pilot hole 6611/1-U-1 from seabed down to 875 m. The pilot hole was drilled 50 m north-north-east of the main well spud location No shallow gas was observed. Wildcat well 6611/1-1 was spudded with the semi-submersible installation West Hercules on 2 November 2019 and drilled to TD at 1905 m in the Grey Beds/Red Beds of Early Triassic (Griesbachian) age. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 824 m and with Glydril mud from 824 m to TD.

The well penetrated a hiatus from base Springer Formation to top Tilje Formation at 1257.5 m. The Tilje Formation contained a ca 10 m oil column with a free water level at 1270.8 m. Geochemical analyses of the oil proved a biodegraded oil devoid of n-alkanes, but sampling and PVT analyses proved the oil to be mobile with a stock tank density of 0.89 g/cm3 and bubble point viscosity of 4.3 mPa-s. Elevated gas readings and weak oil shows described as "spotty dull gold yellow direct fluorescence, with a poor slow, even dull blueish white cut fluorescence" was observed down to 1295 m. Below this depth some minor gas peaks were observed in the Åre Formation and the Grey Beds/Red Beds.

No conventional core was cut. MDT fluid samples were taken at 1257.9 m (oil), 1263.4 m (oil with trace water), 1267.7 m (water with trace oil), and 1362.3 m (water).

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