NORWAY · WELLBORES · NPDID 1534
25/1-7 R4
Exploration · Appraisal · P&A · Gas · Elf Petroleum Norge AS · Frigg · PL 024
25/1-7 R4 is an appraisal exploration wellbore in the North Sea, drilled by Elf Petroleum Norge AS, entered Mar 28, 1990, to 2,716 m in the Jorsalfare Fm.
Discovery 25/1-1 Frigg · On the map →
- 2,716
- m total depth · 2,715 m vertical
- 101
- m water depth
- Mar 28, 1990
- entered · completed Apr 5, 1990
- Jorsalfare Fm
- at total depth · Late Cretaceous
- —
- m of core
- —
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED APR 5, 1992
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
- 9
- Kelly bushing elevation
- 22 m
- Maximum inclination
- 3.70000005°
- Drilling permit
- 455-L5
- Licensing round
- 2-A
- Plugged and abandoned
- Apr 5, 1990
- Core samples available
- No
- Cuttings samples available
- No
- Position · ED50
- 59.91897° N, 2.08120° E
- Hydrocarbons in
- Frigg Fm · Eocene
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 25/1-7 was drilled on the main Frigg structure close to the UK border. The Frigg Field was discovered by well 25/1-1 in 1971. Production from the field started in 1977. A main objective of well 25/1-7 was to establish a reference monitoring station for the production of gas from the Frigg Field. The 25/1-7 R4 was the fourth and last re-entry of the well.The purpose was to log the fluid contacts, and to perform permanent plugging and abandonment.
Operations and results
Appraisal well 25/1-7 R4 was connected and re-entered with the semi-submersible installation West Vanguard on 28 March 1990.
The well was logged (2054.5 - 1913 m) through casing with a Thermal Neutron Decay (TDT) log to determine the fluid contacts. The gas/water contact was found at 1912.2 m MSL, an 8.0 m rise of the water level since April 1989, and a 35.8 m total rise compared to the Frigg pre-production gas/oil contact in the area. A cased hole RFT run was also performed, and the pressure was measured at 1897.2 m, 1919.2 m, 1932.2 m, and at 1961.2 m.
The well was permanently abandoned on 5 April 1990 as a gas appraisal well.
Testing
No drill stem test was performed.
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.
Developers: this page as JSON is GET /v1/data/norway/wells/1534, documented in the API reference.