6507/3-13

General

Well 6507/3-13 was drilled to test the Snadd Outer Outer and Black Vulture prospects on the Dønna Terrace in the Norwegian Sea. The primary objective was to prove mobile gas in the Snadd Outer Outer prospect (Lysing Formation). The secondary objective was to prove hydrocarbon presence in the Black Vulture prospect (Lange Formation). Planned TD was in the Spekk Formation

Operations and results

Wildcat well 6507/3-13 was spudded with the semi-submersible installation Transocean Spitsbergen on 27 April 2019 and drilled to TD at 3420 m in the Early Cretaceous Lyr Formation. Operations proceeded without significant problems however, after plugging back for side-tracking severe losses occurred leading to permanent abandonment and cancelling of the planned side-track 6507/3-13 A. Also, a lower than prognosed formation integrity on the 9 5/8“ shoe prevented to set TD in the Spekk Formation. The well was drilled with seawater and hi-vis pills down to 1302 m and with XP-07 oil-based mud from 1302 m to TD.

Top of primary target Lysing Formation sandstone (Snadd Outer Outer) was penetrated at 2834 m. It was 26 m thick and gas-bearing down to a gas-water contact at ca 2841 m. Top of secondary target intra-Lange Formation sandstones (Black Vulture) was penetrated at 3171 m. The Black Vulture consisted of relatively thin sandstones with hydrocarbon indications interbedded in claystone. It extended down to 3317 m with a main reservoir sand from 3255 to 3280 m. Oil was proven in a 4-meter thick interval above the main reservoir interval. The main reservoir was hydrocarbon bearing, however with a complex fluid distribution. Oil was sampled above a water zone. Below this an oil sample was acquired, and in the deepest sand gas/condensate was sampl