NORWAY · WELLBORES · NPDID 213
25/11-9
Exploration · Appraisal · P&A · Oil/gas · Esso Exploration and Production Norway A/S · Balder · PL 001
25/11-9 is an appraisal exploration wellbore in the North Sea, drilled by Esso Exploration and Production Norway A/S, entered Nov 4, 1980, to 1,910 m in the Tor Fm.
Discovery 25/11-1 Balder · On the map →
- 1,910
- m total depth · 1,910 m vertical
- 126
- m water depth
- Nov 4, 1980
- entered · completed Dec 7, 1980
- Tor Fm
- at total depth · Late Cretaceous
- 4.5
- m of core in 4 cores
- 57
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED DEC 7, 1982
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- NORSKALD · Semisub steel
- Drilling days
- 34
- Kelly bushing elevation
- 25 m
- Maximum inclination
- 0°
- Drilling permit
- 266-L
- Licensing round
- 1-A
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 59.17056° N, 2.37523° E
- Hydrocarbons in
- Intra Balder Fm Ss · Eocene
- Hydrocarbons in
- Hermod Fm · Paleocene
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 25/11-9 was drilled ca km west-south west of the 25/11-1 Balder discovery well 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 to confirm the reservoir quality of Lobe 8 penetrated in the 25/11-5 well. The top of the reservoir was anticipated to be at 1688 m subsea.
Operations and results
Appraisal well 25/11-9 was spudded with the semi-submersible installation Norskald on 4 November 1980 and drilled to TD at 1910 m in the Late Cretaceous Tor Formation. The well was drilled with Seawater/Gel/Lignosulphonate.
The well penetrated the Utsira Formation and several Skade Formation sands and then penetrated a ca 560 m thick section of shale/mudstone/siltstone belonging to the lower Hordaland Group before top Balder Formation was encountered at 1670 m. Drilling revealed two oil sand zones, one of Eocene age between 1708.5 m and 1742 m (Intra Balder Formation sand), the second of Paleocene age (Hermod Formation) between 1781 m and 1785 m, which is the Balder Field oil-water contact. A few thin sands in the upper Balder Formation from 1671 m to1694 m also appeared to be oil bearing. A second Hermod Formation from 1789 to 1818 m was water wet with some weak shows.
Four conventional cores were attempted in the interval 1718 to 1744 m in the Intra Balder Formation Sandstone, but only 3.5 m from the first and 1.5 m from the last core was retrieved. No wire line fluid samples were taken.
The well was permanently abandoned on 7 December 1980 as an oil appraisal well.
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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