6506/11-12 S

General

Well 6506/11-12 S was drilled to appraise the 6506/11-10 S Hades discovery. The primary objective was to delineate gas-bearing intra-Lange Formation sands (Breiflabb Member), reduce the uncertainty of the resource estimate, and to perform a formation test.

Operations and results

Appraisal well 6506/11-12 S was spudded with the semi-submersible installation Island Innovator on 31 May 2020 and drilled to TD at 4150 m in the Early Cretaceous Lange Formation. Most of the NPT on the well is caused by three events: repairing the BOP which caused 95 hours NPT, a burst kelly hose causing 37,5 hours NPT, and total losses at 2038 m due to a small intraformational fault not recognized on seismic during the planning phase causing 36 hours NPT. The well was drilled with seawater and hi-vis pills down to 532 m, with Glydril mud from 532 m to 2410 m, and with RheGuard oil-based mud from 2410 m to TD.

The well encountered top of the target sandstones (Breiflabb Member of the Lange Formation) at 4022 m (3963.2 m TVD) with poor to moderate reservoir quality. The reservoir held a gas column down to a possible gas-water contact / free water level at 4029 m (3971 m TVD) based on log interpretation and XPT measurements. The thick sand package at the top of the Breiflabb Member seen in the discovery well was not encountered, instead intercalated sands and shales were encountered immediately at the top reservoir. Additionally, the well encountered a 28 meters water-bearing sandstone interval at 4098 m with poor to moderate reservoir quality in the deeper part of the Lange Formation (Smørflyndre Member). This unit extended from 4098 m to TD.

There were no oil shows in the well.

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