NORWAY · WELLBORES · NPDID 1279
25/1-7 R2
Exploration · Appraisal · Suspended · Gas · Elf Petroleum Norge AS · Frigg · PL 024
25/1-7 R2 is an appraisal exploration wellbore in the North Sea, drilled by Elf Petroleum Norge AS, entered May 7, 1988, 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
- May 7, 1988
- entered · completed May 10, 1988
- Jorsalfare Fm
- at total depth · Late Cretaceous
- —
- m of core
- —
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED MAY 10, 1990
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
- 4
- Kelly bushing elevation
- 22 m
- Maximum inclination
- 3.70000005°
- Drilling permit
- 455-L3
- Licensing round
- 2-A
- Plugged and abandoned
- —
- 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 objective of the re-entry 25/1-7 R2 was to record the fluid contacts.
Operations and results
Semi-submersible installation West Vanguard arrived the 25/1-7 location on 3 May 1988. Three days were spent on repairing damage on the ROV and clearing off fishing net that was entangled in a rail nearby the well head. Appraisal well 25/1-7 R2 was connected and re-entered on 7 May 1988.
The well was logged (2050 - 1910 m) through casing with a Thermal Neutron Decay (TDT) log to determine the fluid contacts. The contacts found were: base of gas at 1925.4 m MSL, and top of highest water at 1930.2 MSL. No oil leg was observed. From this it was concluded: 1) the gas liquid contact has risen 1.8-3.6 m since 14 February 1987, and 22.6 m since pre-production level (1948.0 m MSL reference). This, compared with 11 m rise in the period 19 April 1985 to 14 February 1987, shows that the water rise is temporarily blocked by shale barriers; 2) The vertical sweep efficiency by water is 100%, which means that all gas-filled sands behind the front are swept.
The well was suspended on 10 May 1988 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.
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