NORWAY · WELLBORES · NPDID 164
7/3-1
Exploration · Wildcat · P&A · Dry · Amoco Norway Oil Company · PL 005
7/3-1 is a wildcat exploration wellbore in the North Sea, drilled by Amoco Norway Oil Company, entered Apr 7, 1969, to 4,700 m in the Undefined Gp.
- 4,700
- m total depth · 4,700 m vertical
- 64
- m water depth
- Apr 7, 1969
- entered · completed Jun 10, 1969
- Undefined Gp
- at total depth · Carboniferous
- 51.1
- m of core in 3 cores
- 131
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED JUN 10, 1971
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- ORION · Jack-up 3 legs
- Drilling days
- 65
- Kelly bushing elevation
- 31 m
- Maximum inclination
- 3.75°
- Drilling permit
- 25-L
- Licensing round
- 1-A
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 57.84313° N, 2.74878° E
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Exploration well 7/3-1 was drilled on the Sørvestlandet High close to the Western part of the Danish Norwegian Basin. Objectives were to test all horizons down to Permian Rotliegendes.
The well is Reference well for the Ran Sandstone Units.
Operations and results
Well 7/3-1 was spudded with the jack-up installation Orion on 7 April and drilled to TD at 4699 m in carbonates of an assumed pre-Permian age. Seawater was used to drill the 36" hole and returns were to the sea floor. A sea water/ Spersene/XP-20 mud was used to a depth of 2735 m, approximately to the top of the rock salt. The mud system was then converted to an invert emulsion oil based mud, which was used to TD. While drilling at 4699 m (TD) a salt water flow occurred and contaminated the mud. The flow was controlled, but the condition of the hole was bad and the lower approximately 120 m of the well, therefore, has not been logged.
The well penetrated relatively complete Tertiary, Cretaceous, Late Jurassic, and the Permian sequences. The Triassic and the Early Jurassic were missing. The Permian Zechstein salt was 1437 m thick, resting on a thin Kupferschiefer sequence. None of the sedimentary sequences penetrated contained significant amounts of hydrocarbons. Three conventional cores were cut in the interval from 4380.6 m to 4575.4 m from the Zechstein salt and into the Rotliegendes Group. No fluid samples were taken.
The well was permanently abandoned 10 June 1969 as a dry well.
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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