NORWAY · WELLBORES · NPDID 259
2/5-4
Exploration · Wildcat · P&A · Oil · Amoco Norway Oil Company · PL 006
2/5-4 is a wildcat exploration wellbore in the North Sea, drilled by Amoco Norway Oil Company, entered Sep 3, 1972, to 3,490 m in the Hod Fm.
Discovery 2/5-4 (Siv) · On the map →
- 3,490
- m total depth
- 68
- m water depth
- Sep 3, 1972
- entered · completed Oct 31, 1972
- Hod Fm
- at total depth · Late Cretaceous
- —
- m of core
- 155
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED OCT 31, 1974
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- ZAPATA EXPLORER · Jack-up 3 legs
- Drilling days
- 59
- Kelly bushing elevation
- 35 m
- Maximum inclination
- 0°
- Drilling permit
- 76-L
- Licensing round
- 1-A
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 56.56511° N, 3.61567° E
- Hydrocarbons in
- Ekofisk Fm · Paleocene
- Hydrocarbons in
- Tor Fm · Late Cretaceous
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Wildcat well 2/5-4 was drilled ca 21 km southeast of the Tor Field in the southern Norwegian North Sea. The primary targets were Paleocene prognosed at 2914 m (9560 ft), and Danian Carbonate prognosed at 3011 (9880 ft).
Operations and results
Well 2/5-4 was spudded with the jack-up installation Zapata Explorer on 3 November 1972 and drilled to TD at 3490 m in the Late Cretaceous Hod Formation. No significant technical problems were reported from the operations. The well was drilled with seawater and hi-vis mud down to 395 m, with an XC polymer, Shale Trol mud from 395 m to 2743 m, and with Chromium-lignosulphonate (Unical) / seawater mud from 2743 m to TD. From 1 to 6 % diesel addition was used all through.
Top Paleocene (Balder Formation) was encountered at 2928 m, top Danian chalk (Ekofisk Formation) at 3039 m, top Maastrichtian chalk (Tor Formation) at 3131 m, and top Campanian chalk (Hod Formation) at 3420 m.
First show (appearance of C2+ on chromatograph) was in shale at 2883 m. Thin sandstone stringers were penetrated in the Paleocene section, but no shows were recorded in these. Oil shows were recorded in the top of the Danian chalk at 3042 - 3063 m, in the top of the Tor Formation at 3133 - 3167 m, and in the Hod Formation at 3435 - 3459 m. Oil was confirmed by testing in the top of the Tor Formation.
Five short cores were taken with the Schlumberger core slicer. Core no 1 was taken at 3441.5 m in the Hod Formation; cores no 2, 4, and 5 were cut at 3137.9 - 3159.6 m in the Tor Formation, and core no 3 was taken at 3051.7 - 3052.6 m in the Ekofisk Formation. The cores are no longer available from the NPD. No fluid sample was taken on wire line.
The well was permanently abandoned on 31 October as an oil discovery.
Testing
Two drill stem tests were performed. The following results are after acidizing:
DST 1 tested the interval 3137 - 3170 in the top of t
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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