31/6-8 R

Exploration · Appraisal · P&A · Oil/gas · Norsk Hydro Produksjon AS · Troll · PL 085

31/6-8 R is an appraisal exploration wellbore in the North Sea, drilled by Norsk Hydro Produksjon AS, entered Jul 22, 1985, to 2,138 m in the Cook Fm.

Discovery 31/6-1 (Troll Øst) · On the map →

2,138: m total depth · 2,138 m vertical
300: m water depth
Jul 22, 1985: entered · completed Sep 22, 1985
Cook Fm: at total depth · Early Jurassic
—: m of core
79: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED SEP 22, 1987

On file for this wellbore

What the Directorate holds from this wellbore. Each opens the section that lists it.

Drilling

Drilling facility: TREASURE SEEKER · Semisub steel
Drilling days: 63
Kelly bushing elevation: 25 m
Maximum inclination: 2°
Drilling permit: 462-L2
Licensing round: Awarded additionally to round 7
Plugged and abandoned: Sep 22, 1985
Core samples available: No
Cuttings samples available: No
Position · ED50: 60.55593° N, 3.67752° E
Hydrocarbons in: Sognefjord Fm · Late Jurassic

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Appraisal well 31/6-8 R is a re-entry of well 31/6-8 in the south-west corner of the Troll East gas province. The objective of the re-entry was an elaborate testing program to obtain a number of reservoir engineering parameters.

Operations and results

Well 31/6-8 re-entered (31/6-8 R) on 22 July 1985 with the semi-submersible installation Treasure Seeker. The well was tested without significant technical problems. Operations took 63 days. After testing the well was plugged and permanently abandoned on 22 September 1985 as a gas and oil appraisal.

Testing

Various tests were performed, including a production test, a sand production test, and fracture testing. Test 1 was a production test from the interval 1537.6 m to 1557.6 m as a high-rate test on a special production string. The test produced through gravel pack at maximum 3900000 Sm3 gas /day on a double 2" choke, which was considered a world record for an offshore well. The liquid production at this rate was ca 105 Sm3, giving a gas/liquid rate of ca 137000 Sm3/Sm3. The maximum temperature during this test, from a gauge at 1528 m, was 68.5 deg. C.

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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