6407/1-8 S

General

Well 6407/1-8 S was drilled to test the Apollonia prospect in the Grinda Graben In the Norwegian Sea. The primary objective was to test the hydrocarbon potential in the Early - Middle Jurassic Garn and Ile formations. No secondary targets were identified pre-drill, but the possible presence of overpressured HC bearing sandstones in the Lange Formation was identified as an operational risk in the overburden. In case of a discovery in the primary target an appraisal side-track 6407/1-8 A was planned.

Operations and results

An 8 1/2" shallow gas pilot hole was drilled to 1250 m equivalent to the planned depth of the 26" hole section. No shallow gas or shallow water influx was observed.

Wildcat well 6407/1-8 S was spudded with the semi-submersible installation West Hercules on 20 September 2020 and drilled to TD at 3570 m (3551 m TVD) m in the Middle Jurassic Ile Formation. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 1245 m, with Glydril water-based mud from 1245 m to 2232 m, with Versatec oil-based mud from 2232 m to 3405 m, and with Exploradril oil-based mud from 3405 m to TD.

Gas peaks and minor shows with direct fluorescence were seen in cutting samples below top of the Nise Formation. Hydrocarbon filled sand was observed in the Lange Formation, confirmed by both logs, pressure points and mud gas measurements. The hydrocarbon shows were bluish white to yellowish white, strong direct fluorescence, no to very slow blooming bluish white cut fluorescence and with no visible cut. The primary targets Garn and Ile formations were dry, with no gas response and no hydrocarbon shows.

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