17/12-4 A is an appraisal exploration wellbore in the North Sea, drilled by BG Norge AS, entered Jul 10, 2009, to 3,338 m in the Bryne Fm.
Discovery 17/12-1 Vette · On the map →
- 3,338
- m total depth · 2,319 m vertical
- 110
- m water depth
- Jul 10, 2009
- entered · completed Aug 15, 2009
- Bryne Fm
- at total depth · Middle Jurassic
- —
- m of core
- 84
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED AUG 15, 2011
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- WEST ALPHA · Semisub steel
- Drilling days
- 37
- Kelly bushing elevation
- 18 m
- Maximum inclination
- 92°
- Drilling permit
- 1264-L
- Licensing round
- TFO2006
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 58.17711° N, 3.91974° E
- Hydrocarbons in
- Bryne Fm · Middle Jurassic
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 17/12-4 A was drilled as a geologic sidetrack to 17/12-4 on the Bream structure in the north-western part of the Egersund Basin of the North Sea. The principle objective of the well was to identify if the Bream prospect contained hydrocarbons in the Sandnes / Bryne formation, and ascertain commercial flow rates from a horizontal well in order to make decisions regarding a future development of the Bream Discovery.
Operations and results
Well 17/12-4 A was sidetracked on 10 July 2009 from below the 13 3/8" shoe at ca 1202 m in well 17/12-4. The well was drilled as a horizontal appraisal well with the semi-submersible installation West Alpha to TD at 3338 m (2319 m TVD) in the Middle Jurassic Bryne Formation. Deviation was at maximum 92 deg at TD. The well was drilled without significant technical problems, but it was not possible to get the liner to the toe of the well, only reaching 2795 m. This may have been partly due to not having the correct reamer shoe on board when picking up the liner. The sidetrack was drilled with Versatec DW oil based mud all through.
The Sandnes Formation came in at 2606 m (2286.7 m TVD) and confirmed a water-wet good reservoir sand within this Formation, as in the primary well. The Bryne Formation came in at 2666.6 m (2305.3 m TVD) and was drilled near-horizontally all through to TD, without penetrating below the main OWC found in the primary well. The Bryne Formation consists of several sand bodies and thin sands with interbedded mudstones and with coal layers in the upper part. Average porosities for the different reservoir units ranged from 17% to 22%. All sands were oil-bearing.
No cores were cut in the well. The well was logged wh
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.
Developers: this page as JSON is GET /v1/data/norway/wells/6178, documented in the API reference.