NORWAY · WELLBORES · NPDID 188
2/5-2
Exploration · Appraisal · P&A · Oil · Amoco Norway Oil Company · Tor · PL 006
2/5-2 is an appraisal exploration wellbore in the North Sea, drilled by Amoco Norway Oil Company, entered Jan 15, 1971, to 3,597 m in the Tor Fm.
Discovery 2/5-1 Tor · On the map →
- 3,597
- m total depth
- 66
- m water depth
- Jan 15, 1971
- entered · completed Apr 20, 1971
- Tor Fm
- at total depth · Late Cretaceous
- 53.6
- ft of core in 5 cores
- 120
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED APR 20, 1973
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- MÆRSK EXPLORER · Semisub steel
- Drilling days
- 96
- Kelly bushing elevation
- 35 m
- Maximum inclination
- 1°
- Drilling permit
- 51-L
- Licensing round
- 1-A
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 56.64489° N, 3.37239° E
- Hydrocarbons in
- Ekofisk Fm · Paleocene
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 2/5-2 was drilled as an appraisal well on the 2/5-1 Tor Discovery in the southern Norwegian North Sea. The objective was to evaluate the eastern part of the structure.
Operations and results
Appraisal well 2/5-2 was spudded with the jack-up installation M ærsk Explorer on 15 January 1971 and drilled to TD at 3597 m in the Late Cretaceous Tor Formation. The well was drilled water based, but with diesel addition below 1830 m.
The well encountered top Paleocene (Balder Formation at 2978 m, top Danian chalk (Ekofisk Formation) at 3118 m, and top Late Cretaceous chalk (Tor Formation) at 3360 m. Commercial quantities of hydrocarbons were encountered in the Ekofisk Formation where a total of approximately 57 m net pay out of a gross section of 244 m was found. This was a significant reduction from the 89 m net pay in the 2/5-1 discovery well. Furthermore, the water saturation in Ekofisk was higher in 2/5-2 compared to 2/5-1 (41% and 22%, respectively).
Five conventional cores were cut in the intervals 3120 - 3188 m and 3235 - 3311 m in the Ekofisk Formation. No wire line fluid samples were taken.
The well was permanently abandoned on 20 April 1971 as a an oil appraisal.
Testing
Six drill stem tests were carried out: DST 1 in Late Cretaceous chalk (Tor Formation), DST 2 in the Late Cretaceous/ Danian boundary, and DST 3 - 6 in Danian chalk (Ekofisk Formation). The following results are after acidization:
DST 1 in the interval 3511 to 3513 m flowed minor quantities of slightly oil-cut mud.
DST 2 at 3350 - 3361 m flowed 165 Sm3, 34 m3 water, and 39077 Sm3 gas /day on 64/64" + 32/64" choke. The oil gravity was 39 deg API and the GOR was 237 Sm3/Sm3.
DST 3 at 3299 - 3314 m flowed 629 Sm3 oil and 159900 Sm3 gas /day on a 23/64" choke. The oil gravity was 40.5 deg API and the GOR was 254 Sm3/Sm3. Maximum bottom hole temperature recorded in
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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