34/5-1 S is a wildcat exploration wellbore in the North Sea, drilled by BG Norge AS, entered Jan 7, 2010, to 3,900 m in the Statfjord Gp.
Discovery 34/5-1 S · On the map →
- 3,900
- m total depth · 3,737 m vertical
- 387
- m water depth
- Jan 7, 2010
- entered · completed Mar 13, 2010
- Statfjord Gp
- at total depth · Early Jurassic
- 48.4
- m of core in 2 cores
- 135
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED MAR 13, 2012
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
- 66
- Kelly bushing elevation
- 25 m
- Maximum inclination
- 35.59999847°
- Drilling permit
- 1292-L
- Licensing round
- TFO2005
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 61.74311° N, 2.59871° E
- Hydrocarbons in
- Cook Fm · Early Jurassic
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 34/5-1 S was drilled on the Blåbær prospect in Tampen North in the northern North Sea, ca 10 km to the southwest the 34/3-1 S Jordbær discovery. The objective was to prove hydrocarbons in the Cook and Statfjord formations.
Operations and results
Wildcat well 34/5-1 S was spudded with the semi-submersible installation Bredford Dolphin on 7 January 2010 and drilled to TD at 3900 m (3737 m TVD) in the Early Jurassic Statfjord Formation. The spud location was selected to avoid an area with risk of possible shallow gas. It was drilled vertical down to the end of the 17 1/2" section at 2135 m, deviated to maximum 35 degrees through the 12 1/4" section and back to vertical in the deepest 100 m of the final 8 1/2" section. Some hole problems were encountered in the 17 1/2" section, believed to be caused by the hole being left open too long due to WOW, otherwise operations went forth without significant problems. The well was drilled with seawater and hi-vis sweeps down to 467 m, with KCl/Glycol Enhanced Mud (GEM) from 467 m to 2135 m, and with XP-07 oil based mud from 2135 m to TD.
Top Cook (Late Pliensbachian) reservoir came in at 3629 m, 57 m shallower than the pre-drill prediction. The Cook Formation sandstones had an average porosity of 18.3% and 20 m of net sand based on a 50% Vsh cut-off and 10% porosity. The secondary target Statfjord Formation was penetrated at 3834 m, 55 m shallower than prognosed. Statfjord was inferred to be water bearing from the LWD data. An extensive wire line programme was carried out after reaching TD. After analysing the acquired data it was concluded that the Cook reservoir was oil bearing. The lower Cook interval showed the best reservoir quality with average porosity of
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.
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