25/1-8 SR4

Exploration · Appraisal · P&A · Gas · Elf Petroleum Norge AS · Frigg · PL 024

25/1-8 SR4 is an appraisal exploration wellbore in the North Sea, drilled by Elf Petroleum Norge AS, entered Apr 3, 1991, to 2,647 m in the Lista Fm.

Discovery 25/1-1 Frigg · On the map →

2,647: m total depth · 2,569 m vertical
102: m water depth
Apr 3, 1991: entered · completed Apr 14, 1991
Lista Fm: at total depth · Paleocene
—: m of core
—: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED APR 14, 1993

On file for this wellbore

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

Drilling

Drilling facility: WEST VANGUARD · Semisub steel
Drilling days: 12
Kelly bushing elevation: 22 m
Maximum inclination: 0°
Drilling permit: 466-L5
Licensing round: 2-A
Plugged and abandoned: Apr 14, 1991
Core samples available: No
Cuttings samples available: No
Position · ED50: 59.90091° N, 2.10272° E
Hydrocarbons in: Frigg Fm · Eocene

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

The Frigg Field was discovered by well 25/1-1 in 1971 and set in production in May 1977. Well 25/1-8 S was drilled in the summer of 1985 to monitor changes in gas/fluid contact, uncover permeability barriers and pressure gradients in the Frigg Formation, refine the geological model, and provide ties for seismic interpretations. Before production started the Frigg Field fluid contacts were: OWC = 1955.9 m TVD MSL and GOC = 1948.2 m TVD MSL. In July 1985 in 25/1-8 S found the oil-leg to be all swept with the exception of a very thin oil-layer lifted to 1903.5 m TVD MSL, 2 m below the new gas/liquid contact, which was now a gas/water contact (GWC) at 1901.3 m TVD MSL. The objective of the fourth re-entry well 25/1-8 SR4 was to monitor further changes in the GWC and to permanently plug and abandon the well.

Operations and results

Appraisal well 25/1-8 S was re-entered (25/1-8 SR4) with the semi-submersible installation West Vanguard on 3 April 1991.

The GWC was found at 1897.5 m TVD MSL, the same as in 25/1-8 SR3. This showed a similar situation as in well 25/1-7 and corresponding re-entries ca 2.5 km to the north. It showed that gas drainage was blocked by shale barriers over large areas in the central parts of the field.

No cores were cut. The RFT was run, and 6 pressure points were taken but no fluid samples.

The well was permanently abandoned on 14 April 1991 as a gas appraisal well.

Testing

No drill stem test was performed.

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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