25/2-13

Exploration · Appraisal · P&A · Oil/gas · Elf Petroleum Norge AS · Hugin Satellitter · PL 026

25/2-13 is an appraisal exploration wellbore in the North Sea, drilled by Elf Petroleum Norge AS, entered Sep 6, 1989, to 3,908 m in the Smith Bank Fm.

Discovery 25/2-5 Lille Frøy (Rind) · On the map →

3,908: m total depth · 3,903 m vertical
117: m water depth
Sep 6, 1989: entered · completed Jan 25, 1990
Smith Bank Fm: at total depth · Late Triassic
280.8: m of core in 19 cores
128: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED JAN 25, 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: 142
Kelly bushing elevation: 22 m
Maximum inclination: 6.19999981°
Drilling permit: 617-L
Licensing round: 2-A
Plugged and abandoned: Aug 6, 2015
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 59.79380° N, 2.45348° E
Hydrocarbons in: Hugin Fm · Middle Jurassic
Hydrocarbons in: Sleipner Fm · Middle Jurassic
Hydrocarbons in: Statfjord Gp · Early Jurassic

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 25/2-13 was drilled in the central part of the Viking Graben, east of the Frigg area. The block straddles the eastern flank of the graben and the north-western part of the Utsira High. It was the first appraisal well on the 25/2-5 discovery, which discovered oil in different reservoirs of the Vestland Group and the Statfjord Formation. The structure is a north-south trending horst, which is located on a terrace in the southern part of the block. Well 25/2-13 was drilled close to a major normal fault bounding the structure. The main objective was to evaluate the western panel. The well should test the fluid columns in both the Vestland Group and the Statfjord Formation, obtain data for fluid characterisation and productivity, and try to define the hydrocarbon contacts of the reservoirs.

Operations and results

Appraisal well 25/2-13 was spudded 6 June 1989 by the semi-submersible installation West Vanguard drilled to TD at 3909 m in the Triassic Smith Bank Formation. The well was drilled to 13" 3/8 casing point (2043 m) without problems, but at 2178 m the bit got stuck and a sidetrack was needed. The sidetrack was kicked off from 2070 m. The first attempt failed, but the second was successful. During coring of the Vestland Group, the core barrel was lost in hole and a second sidetrack was decided after unsuccessful fishing. This sidetrack was kicked off from 3306. The mud that was used in the Jurassic section (3318 - 3887 m) was an FCL type mud which was based on fresh water with added bentonite, polymers, lignosulfonate and barite.

Top Vestland Group came in at 3342 m as prognosed, and with mobile hydrocarbons in two layers; oil in the top ca 40 - 60 m of the reservoir with an unclear OWC in the interval 3382 - 3415 m, a

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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