NORWAY · WELLBORES · NPDID 409
33/9-4
Exploration · Appraisal · P&A · Oil · Mobil Exploration Norway INC · Statfjord · PL 037
33/9-4 is an appraisal exploration wellbore in the North Sea, drilled by Mobil Exploration Norway INC, entered Jul 30, 1975, to 3,076 m in the Hegre Gp.
Discovery 33/12-1 Statfjord · On the map →
- 3,076
- m total depth
- 144
- m water depth
- Jul 30, 1975
- entered · completed Sep 17, 1975
- Hegre Gp
- at total depth · Late Triassic
- 65.2
- m of core in 9 cores
- 75
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED SEP 17, 1977
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- NORSKALD · Semisub steel
- Drilling days
- 50
- Kelly bushing elevation
- 25 m
- Maximum inclination
- 0°
- Drilling permit
- 135-L
- Licensing round
- Awarded additionally to round 2-A
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 61.32960° N, 1.91196° E
- Hydrocarbons in
- Brent Gp · Middle Jurassic
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 33/9-4 was drilled on the Statfjord structure on Tampen Spur in the northern North Sea. The primary objective was to test the northern extension of the Statfjord discovery in the Brent Group.
Operations and results
Appraisal well 33/9-4 was spudded with the semi-submersible installation Norskald on 30 July 1975 and drilled to TD at 3076 m in the Triassic Hegre Group. No significant problem was encountered in the operations. The well was drilled with seawater and spud mud down to 488 m and with Lignosulphonate mud from 488 m to TD.
The objective Brent Group was encountered at 2554.5 meters, 33.9 meters high to prognosis. Measured core porosities in the Brent Group averaged 26 percent. Horizontal liquid permeability ranged from 0.05 to 1100.5 milliDarcy and averaged 2155 milliDarcy. The Brent Group was oil filled down to the oil-water contact at 2611.5 m. This is 2 m deeper than on the southern part of Statfjord Field and constitute an in-well gross oil column of 57 m of which 37 m was calculated as net reservoir with 25.4% average porosity and 24.2% average water saturation. Apart from shows in the oil bearing section an oil show was described on a sidewall core at 2618 m.
Continuous coring was carried out from within the overlying Middle Jurassic shales through the base of the oil/water contact in the Brent sands, from 2547.2 to 2612.5 meters. Of the 56.7 meters cut by nine cores, 50.7 meters (89 percent) was recovered. No fluid sample was taken on wire line.
The well was permanently abandoned on 17 September as an oil appraisal well.
Testing
Around this wellbore
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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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