NORWAY · WELLBORES · NPDID 6376
25/1-11 A
Exploration · Appraisal · P&A · Oil/gas · Det norske oljeselskap ASA · Skogul · PL 460
25/1-11 A is an appraisal exploration wellbore in the North Sea, drilled by Det norske oljeselskap ASA, entered Apr 29, 2010, to 2,410 m in the Heimdal Fm.
Discovery 25/1-11 R Skogul · On the map →
- 2,410
- m total depth · 2,265 m vertical
- 107
- m water depth
- Apr 29, 2010
- entered · completed May 14, 2010
- Heimdal Fm
- at total depth · Late Paleocene
- —
- m of core
- 75
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED MAY 14, 2012
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- AKER BARENTS · Semisub steel
- Drilling days
- 16
- Kelly bushing elevation
- 40 m
- Maximum inclination
- 33°
- Drilling permit
- 1312-L
- Licensing round
- TFO2007
- Plugged and abandoned
- May 14, 2010
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 59.79031° N, 2.21845° E
- Hydrocarbons in
- Frigg Fm · Eocene
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 25/1-11 A is a sidetrack to the Storklakken well 25/1-11 R on the Frigg Ridge between the Frigg and Heimdal Fields in the North Sea. Well 25/1-11R found oil and gas in the Eocene Frigg Formation. The main objective of the sidetrack was to prove the vertical extension of the hydrocarbon column in the Frigg reservoir and to find a potential gas-oil contact. An additional objective was to achieve better control of the Frigg/Odin sand pinch out line.
Operations and results
Well 25/1-11 A was sidetracked on 26 April 2010 from a window in the 13 3/8" casing at 1099 m in the primary well bore. The well was drilled with the semi-submersible installation Aker Barents to TD at 2410 m (2264.5 m TVD) in the Palecocene Heimdal Formation. The well was drilled with Versatec oil based mud from kick-off to TD.
The Frigg Formation came in at 2234 m (2110 m TVD). The upper section down to 2274 m (2145.5 m TVD) was dominantly claystone with thin sandstone stringers. In these sandstone stringers a gas gradient was found. In the main Frigg Sandstone an oil gradient was seen with an oil-down-to contact at 2286 m (2156 m TVD). No water zone was encountered. The gas gradient indicates the possibility of a GOC at 2146.1 m TVD. The pressure regimes in the Frigg Formation in the two well bores are slightly different, indicating a pressure barrier in the Frigg reservoir section between the two wellbores. In the lower section of the well a separate water gradient was found in the Heimdal Formation sandstone with a slightly higher pressure regime compared to the Frigg Sandstone.
No cores were cut. The MDT was run for pressure points and fluid samples. In this operation the MDT got stuck, but was
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/6376, documented in the API reference.