NORWAY · WELLBORES · NPDID 4278
25/4-9 S
Exploration · Wildcat · P&A · Oil · Norsk Hydro Produksjon AS · Vilje · PL 036
25/4-9 S is a wildcat exploration wellbore in the North Sea, drilled by Norsk Hydro Produksjon AS, entered Sep 5, 2003, to 2,377 m in the Heimdal Fm.
Discovery 25/4-9 S Vilje · On the map →
- 2,377
- m total depth · 2,297.3 m vertical
- 120
- m water depth
- Sep 5, 2003
- entered · completed Sep 29, 2003
- Heimdal Fm
- at total depth · Paleocene
- 17.5
- m of core in 1 core
- 80
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED SEP 29, 2005
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- DEEPSEA DELTA · Semisub steel
- Drilling days
- 25
- Kelly bushing elevation
- 29 m
- Maximum inclination
- 23.60000038°
- Drilling permit
- 1006-L
- Licensing round
- 2-A
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 59.67236° N, 2.27798° E
- Hydrocarbons in
- Heimdal Fm · Paleocene
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
The primary target for well 25/4-9 S was a prospect of Paleocene age called Klegg, approximately 11 km north-northeast of the Heimdal field, and four km south-southwest of Vale.
Operations and results
Wildcat well 25/4-9 S was spudded with the semi-submersible installation Deepsea Delta on 5 September 2003 and drilled to TD at 2377 m in the Paleocene Heimdal Formation. It was drilled deviated with a maximum deviation of 23.6 deg at 1609 m. The first two hole sections (36" and 17 1/2 ") were drilled with seawater. The 12 1/4" hole section was drilled with Versavert OBM, while the 8 1/2" hole section (reservoir section) was drilled with NaCl WBM.
The Heimdal Formation reservoir was encountered at 2236 m with 61 meters gross sand (55.9 m net). The sand had very good reservoir properties and was oil bearing. Production from the nearby Heimdal and Frigg fields had caused depletion of the regional aquifer by approximately 18 bars. A Free Water Level was interpreted to be at 2297 m (2197.4 m TVD MSL), but this is probably affected by the production pressure depletion.
Two MDT runs were carried out. Representative oil and water samples, and a large volume of oil were recovered from the Heimdal Formation. One core was cut from 2239.2 m to 2256.5 m close to top of the Heimdal Formation.
The well was permanently abandoned on 29 September 2003 as an oil discovery (the Vilje Discovery).
Testing
No drill stem test was performed.
Around this wellbore
This wellbore on Sodir FactPages → · Press release →
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.
Developers: this page as JSON is GET /v1/data/norway/wells/4278, documented in the API reference.