34/10-7 R

Exploration · Appraisal · P&A · Oil · Den norske stats oljeselskap a.s · Gullfaks · PL 050

34/10-7 R is an appraisal exploration wellbore in the North Sea, drilled by Den norske stats oljeselskap a.s, entered May 31, 1983, to 2,247 m in the Lunde Fm.

Discovery 34/10-1 Gullfaks · On the map →

2,247: m total depth · 2,247 m vertical
204: m water depth
May 31, 1983: entered · completed Jul 14, 1983
Lunde Fm: at total depth · Late Triassic
—: m of core
90: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED JUL 14, 1985

On file for this wellbore

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

Drilling

Drilling facility: ROSS ISLE · Semisub steel
Drilling days: 45
Kelly bushing elevation: 22 m
Maximum inclination: 1.5°
Drilling permit: 237-L2
Licensing round: Awarded additionally to round 3
Plugged and abandoned: Jul 14, 1983
Core samples available: No
Cuttings samples available: No
Position · ED50: 61.20373° N, 2.27460° E
Hydrocarbons in: Cook Fm · Early Jurassic
Hydrocarbons in: Statfjord Gp · Early Jurassic

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 34/10-7 R is a re-entry of well 34/10-7 on the eastern segment of the Gullfaks Field. Well 34/10-7 found oil in the Cook and Statfjord formations and performed a drill stem test from the Cook Formation. The objective of the re-entry was to perform two more drill stem tests in the main reservoir, the Cook Formation.

Operations and results

Well 34/10-7 was re-entered with the semi-submersible installation Ross Isle on 31 May 1983.

No wire line fluid samples were taken. Cores were cut in the primary well bore.

After testing the well was permanently abandoned on 14 July 1983 as an oil and gas appraisal well.

Testing

The Cook Formation was perforated and tested at two levels.

DST 2 tested the interval 1833.4 to 1863.4 m. Towards the end of the main flow it produced 812 Sm3 oil and 99 000 Sm3 gas /day through a 40/64" choke. The GOR was 123 Sm3/Sm3, the oil density was 0.826 g/cm3 and the gas gravity was 0.68 (air = 1). The maximum temperature recorded at perforation depth was 76.2 deg C. After production testing DST 2 included also a seawater injection test and a seawater with surfactant injection test. Injection rates of up to 1600 m3/day of seawater were recorded during the final stages of the injection sequence. Due to fracturing of the reservoir during the first phase of injection no conclusions regarding the effects of the surfactant in the second phase could be made.

DST 3 tested the interval 1807 to 1821 m. Towards the end of th

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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