7219/12-3 S

General

Well 7219/12-3 S was drilled to test the Hurri prospect on the Ringvassøy-Loppa Fault Complex west of the Loppa High in the Barents Sea. The primary objectives were to test the reservoir properties and hydrocarbon potential at Hekkingen Formation/BCU level, and in the Stø Formation. The hydrocarbon potential in the Kolje and Tubåen formations was defined as secondary objectives.

Operations and results

Wildcat well 7219/12-3 S was spudded with the semi-submersible installation Leiv Eiriksson on 3 December 2017 and drilled to TD at 2750 m (2707 m TVD) in the Late Triassic Fruholmen Formation. The well was drilled S-shaped with inclination up to 22.5° in the overburden between 721 and 1726 m, and vertical from there through all target reservoirs to TD. Restrictions in the hole and a leak in the BOP led to 6 days NPT when running the 9 5/8” casing. Otherwise operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 404 m, with KCl/polymer/GEM mud with 3-4.2% glycol from 404 m to 661 m, and with Performadril mud 3 – 5% glycol from 661 m to TD.

A 67 m thick water-bearing sandstone with poor reservoir quality was encountered at 1980 m (1938 m TVD) in the Kolje Formation. Top Hekkingen Formation was encountered at 2169 m (2127 m TVD). No reservoir was encountered at this level. The Stø Formation was encountered at 2243 m (2201 m TVD) with 100 m water-bearing sandstone of moderate to good reservoir quality. The Nordmela Formation was encountered at 2348 m (2306 m TVD) with a total of 90 m water-bearing sandstone layers of moderate quality. The Tubåen Formation was encountered at 2578 m (2535 m TVD) with 40 m water-bearing sandstone of moderate quality.

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