NORWAY · WELLBORES · NPDID 127
31/6-6
Exploration · Appraisal · P&A · Gas · Den norske stats oljeselskap a.s · Troll · PL 085
31/6-6 is an appraisal exploration wellbore in the North Sea, drilled by Den norske stats oljeselskap a.s, entered May 22, 1984, to 2,293 m in the Hegre Gp.
Discovery 31/6-1 (Troll Øst) · On the map →
- 2,293
- m total depth · 2,291 m vertical
- 313
- m water depth
- May 22, 1984
- entered · completed Jul 29, 1984
- Hegre Gp
- at total depth · Late Triassic
- 236.2
- m of core in 9 cores
- 67
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED JUL 29, 1986
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
- 69
- Kelly bushing elevation
- 23 m
- Maximum inclination
- 0°
- Drilling permit
- 416-L
- Licensing round
- Awarded additionally to round 7
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 60.69919° N, 3.93461° E
- Hydrocarbons in
- Intra Heather Fm Ss · Late Jurassic
- Hydrocarbons in
- Sognefjord Fm · Late Jurassic
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 31/6-6 was drilled in the Troll East gas province. It was designed to test possible gas accumulations in the Late to Middle Jurassic sandstones and to test the quality of a reservoir siltstone in the Heather Formation.
Operations and results
Well 31/6-6 was spudded with the semi-submersible installation Deepsea Bergen on 22 May 1984 and drilled to TD 2293 m in the Late Triassic Hegre Group. No significant problem was encountered in the operations. The well was drilled with spud mud down to 716 m, with KCl/polymer mud from 716 m to 1771.5 m, and with pre-hydrated bentonite/CMC mud from 1771.5 m to TD.
The well encountered gas from top Heather reservoir at 1516 m to a GWC at 1568.5 m, 7.5 m into the Sognefjord Formation. No oil shows were reported from the well. Nine conventional cores were cut in the interval 1525 m to 1771.5 m in the Middle to Late Jurassic. FMT samples were taken at 1571.8 m and 1576.5 m in the Sognefjord Formation. Both contained formation water and mud filtrate.
The well was completed on 29 July 1984 as a gas appraisal.
Testing
Two drill stem tests were performed in the well. DST 1A tested 1562 m to 1567.5 m in the Sognefjord Formation sandstone. It produced maximum 779 x 10 Sm3 gas /day on a 64/64" choke. DST 2 from 1523 m to 1536 m in the Heather Formation siltstone showed a very low production rate, 10.7 x 10 Sm3/day. The reservoir temperature was 62.5 deg. C in DST 1A and 58 deg. C in DST 2.
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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