NORWAY · WELLBORES · NPDID 6128
25/8-16 A
Exploration · Appraisal · P&A · Dry · ExxonMobil Exploration and Production Norway AS · PL 027 D
25/8-16 A is an appraisal exploration wellbore in the North Sea, drilled by ExxonMobil Exploration and Production Norway AS, entered May 13, 2009, to 2,324 m in the Shetland Gp.
Discovery 25/8-16 S (Eitri) · On the map →
- 2,324
- m total depth · 2,189 m vertical
- 126
- m water depth
- May 13, 2009
- entered · completed May 23, 2009
- Shetland Gp
- at total depth · Late CRET./PALEOCENE
- —
- m of core
- —
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED MAY 23, 2011
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- BREDFORD DOLPHIN · Semisub steel
- Drilling days
- 12
- Kelly bushing elevation
- 25 m
- Maximum inclination
- 34.29999924°
- Drilling permit
- 1251-L
- Licensing round
- 2-A
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 59.41562° N, 2.48398° E
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 25/8-16 S and its sidetrack 25/8-16 A were drilled on the Utsira High in the southern part of the Viking Graben in the North Sea. Well 25/8-16 S found a 3 m oil column in the Heimdal Formation. The sidetrack well 25/8-16 A was drilled to appraise this discovery down flank of the structural high (where 25/8-16 S is situated).
Operations and results
Appraisal well 25/8-16 A was kicked off from main well 25/8-16 S at 1040 to 1050 m on 13 May 2009. It was drilled with the semi-submersible installation Bredford Dolphin to TD at 2324 m (2189 m TVD) where severe mud losses occurred. Due to this TD was set prematurely and attempts to run wire line logs failed. Also, since there were no returns for lithostratigraphy the stratigraphy at TD was not defined. Last known lithostratigraphic Formation was the Ekofisk Formation, 6 m above TD. The well was drilled with XP-07 oil based mud from kick-off to TD
The Heimdal formation consisted mainly of claystones with a thin sandstone at 2236 m. This sand was partly highly calcite cemented with some thin good porosity sands interbedded with the calcite stringers. The logs showed that the good porosity sands were water filled. Above this sand some thin and unclean siltstone/sandstones were indicated to contain hydrocarbons. However, the MDT tool was not able to pass 1392m and the MDT sampling was aborted. No oil shows were recorded in the well.
No cores were cut and no wire line fluid samples were taken.
The well was permanently abandoned on 23 May 2009.
Testing
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Around this wellbore
This wellbore on Sodir FactPages → · Press release →
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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