NORWAY · WELLBORES · NPDID 1131
25/5-1 A
Exploration · Appraisal · P&A · Oil · Elf Petroleum Norge AS · Hugin Satellitter · PL 102
25/5-1 A is an appraisal exploration wellbore in the North Sea, drilled by Elf Petroleum Norge AS, entered Aug 1, 1987, to 3,432 m in the Drake Fm.
Discovery 25/5-1 Frøy · On the map →
- 3,432
- m total depth · 3,178 m vertical
- 118
- m water depth
- Aug 1, 1987
- entered · completed Sep 16, 1987
- Drake Fm
- at total depth · Early Jurassic
- —
- m of core
- 114
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED SEP 16, 1989
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- NORTRYM · Semisub steel
- Drilling days
- 47
- Kelly bushing elevation
- 25 m
- Maximum inclination
- 49°
- Drilling permit
- 554-L
- Licensing round
- 9
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 59.72977° N, 2.57041° E
- Hydrocarbons in
- Hugin Fm · Middle Jurassic
- Hydrocarbons in
- Sleipner Fm · Middle Jurassic
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Appraisal well 25/5-1 A was drilled as a sidetrack to well 25/5-1. The wells are located in the Northern part of block 25/5 near the crest of a westward tilted Jurassic fault structure that straddles both block 25/5 and block 25/2.
The main purpose of the well was to prove additional accumulation and if possible determine an oil/water contact that might be compared with well 25/5-1. Also checking a possible spill point through the main fault mapped 4 km SSW of well 25/5-1.
Operations and results
Appraisal well 25/5-1A was spudded by Golar-Nor offshore a/s semi-submersible installation Nordtrym 1 August 1987, and completed 16 September 1987 at a depth of 3432 in the Early Jurassic Drake Formation. The Vestland Group came in at 3312 m (3050.9 m TVD MSL), 91.9 m TVD deeper than in 25/5-1 but with the same thickness as in 25/5-1. Top Dunlin Group / Drake Formation came in at 3403 m (3126.7 m TVD MSL). The whole reservoir was oil-saturated, confirming oil down to at least 3126.4 m TVD MSL, very close to the OWC that was estimated from the 25/5-1 pressure gradient data. However, a definite OWC was not observed. All in all the well supported a total vertical oil column of 166 m as estimated from well 25/5-1. The well was plugged and abandoned as an oil appraisal well.
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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