6506/12-2

Exploration · Wildcat · Junked · Not applicable · Den norske stats oljeselskap a.s · PL 094

6506/12-2 is a wildcat exploration wellbore in the Norwegian Sea, drilled by Den norske stats oljeselskap a.s, entered Feb 12, 1985, to 955 m in the Naust Fm.

On the map →

955: m total depth · 955 m vertical
310: m water depth
Feb 12, 1985: entered · completed Feb 28, 1985
Naust Fm: at total depth · Pliocene
—: m of core
24: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED FEB 28, 1987

On file for this wellbore

What the Directorate holds from this wellbore. Each opens the section that lists it.

Drilling

Drilling facility: ROSS ISLE · Semisub steel
Drilling days: 17
Kelly bushing elevation: 22 m
Maximum inclination: 1°
Drilling permit: 453-L
Licensing round: 8
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 65.02496° N, 6.89150° E

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Wildcat well 6506/12-2 is located on the Halten Terrace off shore Mid Norway. Its primary objective was to test possible hydrocarbon accumulations in Middle and Early Jurassic sandstones on the Beta Prospect at an antiform structure in the southeastern part of the block. Secondary objectives were Early Jurassic and Triassic sandstones, in addition to sands within the Coal Beds. Prognosed TD was at 4380 m in the Jurassic coal sequence, or in Middle Jurassic sandstones at 3902 m.

Operations and results

Well 6506/12-2was spudded with the semi-submersible installation Ross Isle on 12 February 1985 and drilled to TD at 955 m in Pliocene sediments (Nordland Group). A pilot hole was drilled to 955 m and logs were run. Shallow gas was detected on log readings at 572 m, and gas peaks of 6.9% at 573 m and 6% at 580 m confirmed this observation. Water flow and lost circulation caused problems, but was stabilised with LCM pills. The well was drilled with seawater and pre-hydrated bentonite.

Problems with a wear bushing caused the abandonment of the well on 28 February 1985. Spudding and drilling of replacement well 6506/12-3 started two days later.

Testing

No drill stem test was performed

Around this wellbore

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About this data

Norwegian Offshore Directorate (Sodir) FactPages, mirrored nightly and used under the Norwegian Licence for Open Government Data (NLOD). Depths are metres along the wellbore from the kelly bushing unless a row gives its own unit; older cores are filed in feet. A zero the Directorate files for an unmeasured pressure, density, or temperature is shown as a dash.

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