NORWAY · WELLBORES · NPDID 5985
6603/12-1
Exploration · Wildcat · P&A · Gas · A/S Norske Shell · PL 326
6603/12-1 is a wildcat exploration wellbore in the Norwegian Sea, drilled by A/S Norske Shell, entered Mar 26, 2009, to 3,830 m in the Springar Fm.
Discovery 6603/12-1 (Gro) · On the map →
- 3,830
- m total depth · 3,830 m vertical
- 1,376
- m water depth
- Mar 26, 2009
- entered · completed Jun 20, 2009
- Springar Fm
- at total depth · Late Cretaceous
- 18.5
- m of core in 1 core
- 143
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED JUN 20, 2011
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- LEIV EIRIKSSON · Semisub steel
- Drilling days
- 87
- Kelly bushing elevation
- 25 m
- Maximum inclination
- 0.80000001°
- Drilling permit
- 1215-L
- Licensing round
- 18
- Plugged and abandoned
- Jun 20, 2009
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 66.14787° N, 3.94157° E
- Hydrocarbons in
- Springar Fm · Late Cretaceous
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 6603/12-1 was drilled as an exploration wildcat well in the Norwegian Atlantic Margin (Vøring Basin). The main objectives of the well were to prove the presence and quality of reservoir and hydrocarbons in the Late Cretaceous (K98 - Maastrichtian) Springar Formation Sandstone.
Operations and results
A 12 1/4" pilot hole (6603/12-U-1) was spudded 63 m to the southwest of the main hole in order to evaluate pore pressures, assess the risk of shallow water flow and to gain insight into the wellbore stability in the interval down to the 20" casing depth in the main hole. The pilot was drilled to 2195 m into the Brygge Formation and below the Opal A to CT transition, without encountering shallow geohazards. The water temperature at seafloor, measured by means of a ROV, was -1 deg C.
Wildcat well 6603/12-1 was spudded with the semi-submersible installation Leiv Eriksson on 26 March 2009 and drilled to TD at 3830 m in the Late Cretaceous Springar Formation. No shallow gas was encountered. The well was drilled with Seawater and hi-vis sweeps down to 2359 m, with Glydril mud from 2359 m to 3509 m, and with Paratherm oil based mud from 3509 m to TD.
The well penetrated rocks of Quaternary, Tertiary and Cretaceous age. Top Maastrichtian Springar Formation came in at 3505 m with the target Springar Formation sandstone member at 3704 m, 40 m shallower than prognosed. The Springar Formation sandstone member was gas-bearing with a 15 m gas column from the top down to 3720 m. Poor pressure data did not allow estimation of the true OWC.
One 18m core was taken from the reservoir interval (3712.7 - 3730.7 m) with 100% recovery.
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/5985, documented in the API reference.