NORWAY · WELLBORES · NPDID 219
35/3-4
Exploration · Appraisal · P&A · Gas/condensate · Saga Petroleum ASA · PL 041
35/3-4 is an appraisal exploration wellbore in the North Sea, drilled by Saga Petroleum ASA, entered Nov 30, 1980, to 4,089 m in the Basement.
Discovery 35/3-2 Agat · On the map →
- 4,089
- m total depth · 4,087 m vertical
- 258
- m water depth
- Nov 30, 1980
- entered · completed Jun 6, 1981
- Basement
- at total depth · Pre-Devonian
- 98.2
- m of core in 11 cores
- 125
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED MAR 1, 2026 · RELEASED JUN 6, 1983
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- BYFORD DOLPHIN · Semisub steel
- Drilling days
- 189
- Kelly bushing elevation
- 25 m
- Maximum inclination
- 3.5°
- Drilling permit
- 272-L
- Licensing round
- 3
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- No
- Position · ED50
- 61.86515° N, 3.87416° E
- Hydrocarbons in
- Agat Fm · Early Cretaceous
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Wildcat wells 35/3-3 and 35/3-4 were drilled in the Norwegian sector of the North Sea approximately 50 km west of MålØy, Norway. The primary target was to test the possible extension of Lower Cretaceous sandstones to the east of those encountered in wells 35/3-1 and 35/3-2. A stratigraphic trap was thought to exist in these sandstones. A secondary target was possible sandstones of Early Jurassic age with a possible pinch-out trap.
Well 35/3-3 was spudded with the semi-submersible installation Byford Dolphin on 30 October 1980. It was drilled and logged to 900 m, then junked because of technical problems running the 20" casing. The rig was moved about 20 meters, and the well was respudded as 35/3-4.
Operations and results
Well 35/3-4 was spudded with the semi-submersible installation Byford Dolphin on 30 November 1980 and drilled to TD at 4089 m in Basement rocks (Caledonian age). A sidetrack was drilled from 3768 m. The well was drilled with seawater and gel down to 457m, with seawater/gel/lignosulfonate from 457 m to 879 m, with lignosulfonate/gypsum/gel mud from 879 m to 2388 m, and with gel/lignosulfonate/PAC mud from 2388 m to TD.
The well penetrated strata from Tertiary through Jurassic before reaching basement rocks-of Caledonian age.
Hydrocarbon shows were encountered in Lower Cretaceous and Lower-Middle Jurassic sand. The Lower Cretaceous sediments were interpreted as submarine fans. RFT measurements in Lower Cretaceous indicate an upper zone with a gas gradient of 0.4 psi/m, and a deeper zone with a water gradient of 1,54 psi/m. There seem to be no pressure communication between these two zones. Log evaluation in
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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