NORWAY · WELLBORES · NPDID 177
2/4-5
Exploration · Appraisal · P&A · Oil · Phillips Petroleum Company Norway · Ekofisk · PL 018
2/4-5 is an appraisal exploration wellbore in the North Sea, drilled by Phillips Petroleum Company Norway, entered Jun 21, 1970, to 3,320 m in the Tor Fm.
Discovery 2/4-2 Ekofisk · On the map →
- 3,320
- m total depth
- 68
- m water depth
- Jun 21, 1970
- entered · completed Aug 27, 1970
- Tor Fm
- at total depth · Late Cretaceous
- 86.3
- ft of core in 12 cores
- 132
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED AUG 27, 1972
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- PENTAGONE 81 · Semisub steel
- Drilling days
- 68
- Kelly bushing elevation
- 24 m
- Maximum inclination
- 3.5°
- Drilling permit
- 40-L
- Licensing round
- 1-A
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- No
- Position · ED50
- 56.57423° N, 3.20328° E
- Hydrocarbons in
- Ekofisk Fm · Paleocene
- Hydrocarbons in
- Tor Fm · Late Cretaceous
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 2/4-5 (named 2/4-4X by operator Phillips) was drilled to appraise the northern segment of the 2/4-2 Ekofisk discovery. The Ekofisk discovery is located in the Central Trough in the southern Norwegian North Sea and its structure is an anticline, uplifted by halokinetic movements of Permian salt. The objective of well 2/4-4 was to test the Tertiary and the top of the Late Cretaceous. Planned total depth was 11000 ft (3352 m).
The well is Type Well for the Ekofisk Formation.
Operations and results
Well 2/4-5 was spudded with the semi-submersible installation Neptune 7 on 21 June 1970 and drilled to TD at 3320 m in the Late Cretaceous Tor Formation. The well was drilled with seawater and hi-vis mud down to 585 m, with seawater/lignosulphonate mud from 585 to 3217 m, and with seawater/drill-aid mud from 3217 m to TD. Below 584 m 2 - 5 % diesel was added to the mud.
The Danian Chalk (Ekofisk Formation) was encountered at 3037 m and the Maastrichtian chalk (Tor Formation) was encountered at 3164 m. Both formations were hydrocarbon bearing. A total of 86.2 m core was recovered in 12 cores in the interval 3094 to 3206 m in the Ekofisk and Tor Formations. No fluid samples were taken on wire line.
The well was permanently abandoned on 27 August 1970 as an oil appraisal.
Testing
Five zones in the Ekofisk and Tor Formations were perforated for testing.
DST 1 and DST 1A tested the intervals 3164 -3203 m and 3177 - 3186 m in the Tor Formation, respectively. DST 1 produced at maximum 165795 Sm3 gas and 701 Sm3 oil /day on a 24/64" choke. The GOR was 236 Sm3/Sm3; the oil gravity was 37.3 deg API. The reservoir temperature in the DST1 zone was reported to be 129.4 deg C. DST 1A was conducted with smaller choke sizes and gave somewhat lower rates than in DST 1, but fluid properties were similar.
DST 2 tested the interval 3106 -3143 m in the Ekofisk Formation, but was
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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