NORWAY · WELLBORES · NPDID 365
25/10-5
Exploration · Appraisal · P&A · Oil · Esso Exploration and Production Norway A/S · Balder · PL 028
25/10-5 is an appraisal exploration wellbore in the North Sea, drilled by Esso Exploration and Production Norway A/S, entered Jun 15, 1981, to 2,011 m in the Viking Gp.
Discovery 25/11-1 Balder · On the map →
- 2,011
- m total depth
- 125
- m water depth
- Jun 15, 1981
- entered · completed Jul 17, 1981
- Viking Gp
- at total depth · Late Jurassic
- 13.3
- m of core in 4 cores
- 55
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED JUL 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
- 33
- Kelly bushing elevation
- 25 m
- Maximum inclination
- 0°
- Drilling permit
- 291-L
- Licensing round
- 2-A
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 59.18034° N, 2.32416° E
- Hydrocarbons in
- Intra Balder Fm Ss · Eocene
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
The 25/10-5 well was drilled to establish the presence of an accumulation of Eocene oil sand in the western part of the Balder Field, and evaluate the geologic concept of sand-shale distribution and reservoir quality.
Operations and results
Wildcat well 25/10-5 was spudded with the semi-submersible installation Glomar Biscay II on 15 June 1981 and drilled to TD at 2011 m in the Late Jurassic Viking Group. The well was drilled with sea water/gel/lignosulphonate.
The top of the Early Eocene reservoir was encountered at 1733 m (1708 m sub sea), as prognosed. The reservoir consisted of thin sandstone beds interbedded with shale and was oil bearing. A 49.5 m gross oil column was found down to an OWC at 1782.5 m. The net oil sandstone thickness was 18.2 m. Late Eocene Grid Formation sandstone was penetrated at 1398 m to 1443 m and Paleocene Heimdal Formation sandstone from 1905 m to 1929 m. These were both water wet without shows.
Four cores were cut in the Lower Eocene reservoir sequence. No wire line test or fluid sampling was carried out.
The well was permanently abandoned on 17 July 1981 as an oil appraisal well.
Testing
Two drill stem tests were performed in the Early Eocene reservoir. DST 1 perforated the interval 1756 m to 1753 m and produced 171 Sm3 oil/day. The oil gravity was 25.3 deg API and the gas/oil ratio was 59 m3/m3. DST2 perforated the intervals 1732 - 1740 m and 1756 - 1763 m. It produced 515 Sm3 oil/day. The oil gravity in DST2 was 25.5 deg API and the gas/oil ratio was 59 m3/m3.
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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