NORWAY · WELLBORES · NPDID 1940
34/10-36
Exploration · Appraisal · P&A · Oil · Den norske stats oljeselskap a.s · Gullfaks Sør · PL 050
34/10-36 is an appraisal exploration wellbore in the North Sea, drilled by Den norske stats oljeselskap a.s, entered Apr 28, 1992, to 3,640 m in the Cook Fm.
Discovery 34/10-2 Gullfaks Sør · On the map →
- 3,640
- m total depth · 3,634 m vertical
- 136
- m water depth
- Apr 28, 1992
- entered · completed Jul 13, 1992
- Cook Fm
- at total depth · Early Jurassic
- 78
- m of core in 3 cores
- 134
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED JUL 13, 1994
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- DEEPSEA BERGEN decom · Semisub steel
- Drilling days
- 77
- Kelly bushing elevation
- 23 m
- Maximum inclination
- 10.5°
- Drilling permit
- 723-L
- Licensing round
- Awarded additionally to round 3
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 61.11347° N, 2.17643° E
- Hydrocarbons in
- Tarbert Fm · Middle Jurassic
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 34/10-36 was the sixth well drilled on the Gullfaks Sør structure. The objectives were to test the potential of Intra-Draupne Formation turbiditic sandstone, and to confirm the gas-oil contact, the oil-water contact, and the pressure regime in the Brent Group.
Operations and results
Appraisal well 34/10-36 was spudded with the semi-submersible installation Deepsea Bergen on 28 April 1992 and drilled to TD at 3640 m in the Early Jurassic Cook Formation. A 9 7/8” pilot hole was drilled from surface to 859 m to check for shallow gas. The MWD indicated several sands but all were water-filled. The well was drilled with seawater and CMC down to 1071 m, with gypsum/polymer mud from 1071 m to 3010 m, and with Ancotemp/bentonite from 3010 m to TD.
The Draupne Formation consisted of shale with only traces of sandstone stringers towards the base. The Brent Group, Tarbert Formation was encountered at 3361 m (3355.3 m TVD), 55 m deeper than prognosed. It was oil-bearing down to the OWC at 3377.5 m (3371.9 m TVD). Shows were seen down to 3397 m. The GOC was not penetrated in the well location.
Three cores were cut in the well. Core 1 was cut from 3029 to 3054 m in the Draupne Formation. Cores 2 and 3 were cut in the Tarbert Formation from 3363 m to 3417 m. The core shifts for cores 1, 2 and 3 were 3.0 m, 2.3 m and 2.3 m, respectively. One segregated sample was taken at 3363.8 m. The 2 3/4 gallon chamber contained 3.5 litres of oil, 3.5 litres of mud filtrate and 0.22 m3 gas. No CO2 or H2S was detected from this sample chamber.
The well was permanently abandoned on 13 July 1992 as an oil appraisal well.
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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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