NORWAY · WELLBORES · NPDID 5765
31/1-1
Exploration · Wildcat · P&A · Dry · Marathon Petroleum Norge AS · PL 311
31/1-1 is a wildcat exploration wellbore in the North Sea, drilled by Marathon Petroleum Norge AS, entered Jan 2, 2008, to 2,920 m in the Statfjord Gp.
- 2,920
- m total depth · 2,920 m vertical
- 341
- m water depth
- Jan 2, 2008
- entered · completed Feb 15, 2008
- Statfjord Gp
- at total depth · Early Jurassic
- —
- m of core
- 103
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED FEB 15, 2010
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- BREDFORD DOLPHIN · Semisub steel
- Drilling days
- 45
- Kelly bushing elevation
- 25 m
- Maximum inclination
- 1.20000005°
- Drilling permit
- 1166-L
- Licensing round
- TFO2003
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 60.81913° N, 3.31504° E
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Wildcat well 31/1-1 was drilled on the Bjørn prospect ca 10 km due west of the Troll West oil province. The primary target was the fluvial-deltaic Middle Jurassic Brent Group. Secondary targets were the underlying Lower Jurassic Cook and Statfjord Formations. Planned TD was 2977 m, or 100 m into the Early Jurassic Statfjord Formation.
Operations and results
The rig came on cost on the 22nd of December 2007. Prior to spud, 8 days were spent waiting on weather to set anchors. Well 31/1-1 was spudded on 2 January 2008 by the semi-submersible rig Bredford Dolphin. The well was drilled vertically to a TD at 2920m in the Early Jurassic Statfjord Formation. It was drilled with seawater down to 546 m, with KCl/glycol mud from 546 m to 1219 m, and with Performadril mud from 1219 m to TD.
Reservoir quality sands were encountered in the 3 targets zones but all were water bearing. Weak shows were recorded at 2414 to 2449 m in siltstone/sandstone of theTarbert Formation, and at 2514 to 2564 m in sandstone of the Etive Formation.
No cores were cut and no wire line fluid samples were taken.
The well was permanently abandoned on 15 February 2008 as a dry well.
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/5765, documented in the API reference.