NORWAY · WELLBORES · NPDID 4716
25/4-7
Exploration · Wildcat · P&A · Oil · Marathon Petroleum Norge AS · Alvheim · PL 203
25/4-7 is a wildcat exploration wellbore in the North Sea, drilled by Marathon Petroleum Norge AS, entered Mar 21, 2003, to 2,286 m in the Heimdal Fm.
Discovery 25/4-7 Alvheim · On the map →
- 2,286
- m total depth · 2,286 m vertical
- 119
- m water depth
- Mar 21, 2003
- entered · completed Apr 17, 2003
- Heimdal Fm
- at total depth · Paleocene
- 52
- m of core in 2 cores
- 73
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED APR 17, 2005
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- DEEPSEA BERGEN decom · Semisub steel
- Drilling days
- 27
- Kelly bushing elevation
- 23 m
- Maximum inclination
- 2.5999999°
- Drilling permit
- 1053-L
- Licensing round
- 15
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 59.54782° N, 2.01970° E
- Hydrocarbons in
- Heimdal Fm · Paleocene
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
The Kneler well 25/4-7 was designed as an exploratory test of an irregular 4-way closure midway between the Kameleon structure (discovered by well 24/6-2 in 1998), and the Gekko structure (discovered by well 25/4-3 in 1974), which found a thin hydrocarbon column. The primary reservoir target was the Paleocene Heimdal formation. Well 25/4-7 was designed to provide local structural control to reduce uncertainty in field size and also provide stratigraphic control, particularly the position and character of a shale horizon at the base of the Upper Heimdal reservoir.
Operations and results
Exploration well 25/4-7 was spudded with the semi-submersible installation Deepsea Bergen on 21 March 2003 and drilled to TD at 2286 m in the Paleocene Heimdal Formation. The well was drilled without significant problems. A number of attempts to get wire line tools to TD failed due to hole obstructions. Hole opening of the 12 1/4" section to 8 1/2" was performed in several steps. Between hole opening operations logging was attempted with variable success. Logs were finally acquired down to 2242 m. The well was drilled with seawater down to 1317 m and with Carbosea oil based mud from 1317 m to TD.
The Heimdal Formation was encountered at 2084.5 m and from logs, MDT sampling, and shows on cores and cuttings it was oil bearing down to the OWC at 2132.5 m. The Heimdal Formation at this location consists of an upper, heterolithic
dominated sequence down to 2105.5 m and more massive sandstone below that depth.
A total of 53 m of core (97.7 % recovery) was cut in two cores in the interval from 2104 m to 2157 m in the Heimdal formation. MDT fluid samples were taken at 2086.4 m (oil), 2110.0 m (oil), and at 2144.7 m (water).
The well was suspended as an oil discovery on 17 April 2003
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/4716, documented in the API reference.