NORWAY · WELLBORES · NPDID 370
25/11-10
Exploration · Appraisal · P&A · Shows · Esso Exploration and Production Norway A/S · Balder · PL 001
25/11-10 is an appraisal exploration wellbore in the North Sea, drilled by Esso Exploration and Production Norway A/S, entered Jan 20, 1981, to 1,988 m in the Ekofisk Fm.
Discovery 25/11-1 Balder · On the map →
- 1,988
- m total depth · 1,988 m vertical
- 124
- m water depth
- Jan 20, 1981
- entered · completed Feb 17, 1981
- Ekofisk Fm
- at total depth · Paleocene
- —
- m of core
- 55
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED FEB 17, 1983
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- GLOMAR BISCAY II · Semisub steel
- Drilling days
- 29
- Kelly bushing elevation
- 25 m
- Maximum inclination
- 0°
- Drilling permit
- 274-L
- Licensing round
- 1-A
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 59.16909° N, 2.34944° E
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 25/11-10 was drilled to appraise the Balder Field on the Utsira High in the North Sea. The objective was to establish the presence of a thick accumulation of oil sand in the southern part of the Balder Field, and evaluate the geologic concept of sand-shale distribution and the reservoir quality of the Paleocene sands.
Operations and results
Appraisal well 25/11-10 was spudded with the semi-submersible installation Glomar Biscay II on 20 January 1981 on and drilled to TD at 1988 m (1985 m logger's depth) in the Danian age chalk of the Ekofisk Formation. The well was drilled with seawater/gel/Lignosulphonate mud.
The Paleocene Heimdal Formation reservoir sands anticipated to be present in this well were found at 1786 m, significantly deeper than prognosed and below the field oil-water contact. Gross thickness of the sands was 128.2 m with an average porosity of 31.4%. They were water wet. The sands were found similar to those found in 25/11-7 to the north. Only thin stringers (2.5 m totally) with shows between 1757 m and 1785 m were found in the Sele and Lista formations.
No cores were cut and no wire line fluid samples were taken.
The well was permanently abandoned on 17 February 1981 as a dry well with shows.
Testing
No drill stem test was performed.
Around this wellbore
This wellbore on Sodir FactPages →
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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