31/5-1
Exploration · Appraisal · Junked · Not applicable · Saga Petroleum ASA · Troll · PL 085
31/5-1 is an appraisal exploration wellbore in the North Sea, drilled by Saga Petroleum ASA, entered Sep 5, 1983, to 860 m in the Hordaland Gp.
Discovery 31/2-1 (Troll Vest) · On the map →
- 860
- m total depth · 860 m vertical
- 316
- m water depth
- Sep 5, 1983
- entered · completed Sep 30, 1983
- Hordaland Gp
- at total depth · Oligocene
- —
- m of core
- 31
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED SEP 30, 1985
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- TREASURE SAGA · Semisub steel
- Drilling days
- 26
- Kelly bushing elevation
- 26 m
- Maximum inclination
- 2°
- Drilling permit
- 386-L
- Licensing round
- Awarded additionally to round 7
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 60.72588° N, 3.54917° E
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 31/5-1 was drilled as an appraisal well at the southern part of the Troll West Field. The purpose of the well was to test the reservoir qualities, the oil/gas columns, and the hydrocarbon/water contact in the area.
Operations and results
Appraisal well 31/5-1 was spudded with the semi-submersible installation Treasure Saga on 5 September 1983. The well was drilled with seawater and hi-vis pills all through. After drilling to 860 m and setting the 20" casing, the BOP was run on riser. When the BOP was 12 m above the well head the drill pipe elevator broke, and the BOP dropped down and damaged the well head. The BOP and some riser joints were recovered before the rig was towed to Bergen where the BOP was changed.
No cores were cut and no wire line fluid samples were taken.
The well was abandoned on 30 September 1983 as a junk well. After repairs Treasure Saga returned to the location on 5 October 1983 to spud replacement well 31/5-2.
Testing
No drill stem test was performed.
Around this wellbore
This wellbore on Sodir FactPages →
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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