NORWAY · WELLBORES · NPDID 6109
33/9-21 A
Exploration · Appraisal · P&A · Oil · Wintershall Norge ASA · PL 037 D
33/9-21 A is an appraisal exploration wellbore in the North Sea, drilled by Wintershall Norge ASA, entered Apr 17, 2009, to 6,392 m in the Ness Fm.
Discovery 33/9-6 DELTA · On the map →
- 6,392
- m total depth · 3,027 m vertical
- 156
- m water depth
- Apr 17, 2009
- entered · completed Apr 30, 2009
- Ness Fm
- at total depth · Middle Jurassic
- —
- m of core
- —
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED APR 30, 2011
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- MURCHISON A · Jacket 12 legs
- Drilling days
- 14
- Kelly bushing elevation
- 56 m
- Maximum inclination
- 93.80000305°
- Drilling permit
- 1247-L
- Licensing round
- Awarded additionally to round 2-A
- Plugged and abandoned
- —
- Core samples available
- No
- Cuttings samples available
- No
- Position · ED50
- 61.39674° N, 1.74090° E
- Hydrocarbons in
- Brent Gp · Middle Jurassic
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
The Delta discovery, made by well 33/9-6 in 1976, is situated approximately 4.5 km east of the Murchison platform. Well 33/9-6 had good oil shows, but was not tested due to mechanical problems. An oil down-to at 2998 m TVDSS corresponding to the top Mid Ness shale was seen in the well. The well had moderate reservoir quality within the Tarbert/Ness Formations, and excellent reservoir quality within the water-bearing Etive Formation.
Appraisal well 33/9-21 S confirmed the reservoir properties found in 33/9-6 and with an OWC in the Etive Formation.
The horizontal sidetrack 33/9-21 A was drilled to further appraise the oil-bearing sands.
The well was drilled from the Murchison Platform on the UK side of the border, where the well name is UK211/19a-M75y.
Operations and results
After two unsuccessful attempts to kick off appraisal well 33/9-21 A was finally kicked off on 17 April 2009 at 5185 m (2687 m TVD SS) in well 33/9-21 S. Kick-off point was in the Shetland Group. The well was drilled as a horizontal producer and reached TD at 6392 m (2971 m TVD SS) in the Late Jurassic Heather Formation. The well was drilled with Versaclean oil based mud from kick-off to TD.
Top target reservoir came in at 5902 m (2970 m TVD SS). The well penetrated 465 m MD of Tarbet and Ness sands and it became evident that the reservoir dipped downwards so that the Etive Formation came below the OWC. After drilling through the top of the reservoir back into the Heather Formation a second sidetrack was decided in order to reach the Etive sands within the hydrocarbon-bearing zone. Shows were reported as
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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