31/2-12
Exploration · Appraisal · P&A · Oil/gas · A/S Norske Shell · Troll · PL 054
31/2-12 is an appraisal exploration wellbore in the North Sea, drilled by A/S Norske Shell, entered May 26, 1983, to 1,615 m in the Fensfjord Fm.
Discovery 31/2-1 (Troll Vest) · On the map →
- 1,615
- m total depth · 1,615 m vertical
- 334
- m water depth
- May 26, 1983
- entered · completed Sep 9, 1983
- Fensfjord Fm
- at total depth · Middle Jurassic
- 86.3
- m of core in 10 cores
- 71
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED SEP 9, 1985
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- BORGNY DOLPHIN · Semisub steel
- Drilling days
- 93
- Kelly bushing elevation
- 25 m
- Maximum inclination
- 2°
- Drilling permit
- 373-L
- Licensing round
- 4
- Plugged and abandoned
- Sep 9, 1983
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 60.83483° N, 3.51346° E
- Hydrocarbons in
- Sognefjord Fm · Late Jurassic
- Hydrocarbons in
- Fensfjord Fm · Middle Jurassic
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 31/2-12 was drilled as an appraisal well in the Troll West oil province in the Northern North Sea. The main objectives were to evaluate various techniques for gas production wells in the Troll field, to establish the reservoir quality in the central part of the Troll field gas accumulation, and to provide additional data point for the correlation and mapping of the depositional units.
Operations and results
Well 31/2-12 was spudded with the semi-submersible installation Borgny Dolphin on 26 May 1983 and drilled to TD at 1615 m in the Middle Jurassic Fensfjord Formation. On 4 June, after running the BOP-stack, operations were interrupted by a labour dispute. After the strike ended on 17 June problems with the BOP lead to a further 4 days delay before normal drilling operations were resumed. Some instability problems and well kicks were encountered while drilling and testing in the reservoir. The well was drilled with Seawater and gel down to 807 m, with KCl/polymer mud from 807 m to 1338 m, and with CaCl2/CaCO3/polymer mud from 1338 m to TD.
Top reservoir in well 31/2-12 was encountered at 1365 m. The formations were interpreted to be gas bearing all through the Sognefjord Formation, the Heather Formation (1487 - 1541 m), and down to a clear GOC at 1570.5 m in the Fensfjord Formation. The upper part of the Sognefjord Formation consisted of generally clean sandstones. Below 1455 m the sands were micaceous and silty. Tight calcareous streaks occurred over the whole section. Oil was interpreted from 1570.5 m down to 1581.0 m, where an abrupt drop in resistivity was interpreted as the oil/water contact. The contact was somewhat obscured however by a change in lithology from clean, but rather tight, sandstone to micaceous sandstone. No movable oil was calculated below this depth, but shows (fluorescence and cut) was observed on sidewall cores down to 1608 m.
Ten cores were cut in the Late Jurassic Sognefjord reservo
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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