NORWAY · WELLBORES · NPDID 6255
25/4-10 A
Exploration · Wildcat · P&A · Gas · Marathon Petroleum Norge AS · PL 203
25/4-10 A is a wildcat exploration wellbore in the North Sea, drilled by Marathon Petroleum Norge AS, entered Nov 11, 2009, to 2,550 m in the Heimdal Fm.
Discovery 25/4-10 A · On the map →
- 2,550
- m total depth · 2,191 m vertical
- 123
- m water depth
- Nov 11, 2009
- entered · completed Nov 28, 2009
- Heimdal Fm
- at total depth · Paleocene
- —
- m of core
- —
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED NOV 28, 2011
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- TRANSOCEAN WINNER · Semisub steel
- Drilling days
- 18
- Kelly bushing elevation
- 26 m
- Maximum inclination
- 42.59999847°
- Drilling permit
- 1285-L
- Licensing round
- 15
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 59.51429° N, 2.00383° E
- Hydrocarbons in
- Heimdal Fm · Paleocene
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 25/4-10 A is a geological sidetrack to 25/4-10 S in the Vana Sub-basin in the North Sea. Well 25/4-10 S proved a minor oil discovery in Hermod Formation injection sands. The objective of the sidetrack was to test the South Kneler prospect in Heimdal Formation turbidite fans between the Kneler oil field to the north, and the Gekko gas discovery to the east.
Operations and results
Wildcat well 25/4-10 A was drilled with the semi-submersible installation Transocean Winner. It was kicked off from 816 m in the primary well on 11 November 2009 and drilled to TD at 2550 m (2193 m TVD) in the Paleocene Heimdal Formation. The well was drilled with Versatec OBM from kick-off to TD.
The Sele Formation came in at 2323m (1993 m TVD) and the Heimdal Formation at 2476 m (2108 m TVD). The sidetrack well encountered gas in two sandstone layers which were six metres thick in total in the Lista Formation. The reservoir rock was significantly thinner than expected. Oil shows in the well, if any, were masked by the oil based mud.
No cores were cut and no wire line fluid samples were taken.
The well was permanently abandoned on 28 November 2009 as a minor gas 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/6255, documented in the API reference.