NORWAY · WELLBORES · NPDID 6655
7/11-12 A
Exploration · Wildcat · P&A · Gas · ConocoPhillips Skandinavia AS · PL 301 CS
7/11-12 A is a wildcat exploration wellbore in the North Sea, drilled by ConocoPhillips Skandinavia AS, entered Aug 8, 2011, to 5,672 m in the Skagerrak Fm.
Discovery 7/11-12 A · On the map →
- 5,672
- m total depth · 5,248 m vertical
- 72
- m water depth
- Aug 8, 2011
- entered · completed Dec 31, 2011
- Skagerrak Fm
- at total depth · Triassic
- —
- m of core
- —
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED MAR 15, 2013
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- MÆRSK GALLANT · Jack-up 3 legs
- Drilling days
- 146
- Kelly bushing elevation
- 47 m
- Maximum inclination
- 52.70000076°
- Drilling permit
- 1368-L
- Licensing round
- TFO2003
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 57.01514° N, 2.60376° E
- Hydrocarbons in
- Ula Fm · Late Jurassic
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 7/11-12 A is a geologic sidetrack from well 7/11-12 S, which found gas in tight sands in the Jurassic Peking Duck Prospect located 19 km SW of the Ula Field and 28 km NE of the UK Jade Field. The primary objective of the sidetrack was to test for reservoir and hydrocarbon presence in the Agn prospect in the Jurassic Ula Formation sandstone and the Triassic Skagerrak Formation sandstone ca 1 km NW of the Triassic Peking Duck prospect.
Operations and results
Wildcat well 7/11-12 A was kicked off on 8 August 2011 from the original 7/11-12 S well through a window cut from 3906.3 m to 3912.3 m in the 10"X 10 3/4" casing. It was drilled with the jack-up installation Mærsk Gallant to TD at 5672 m (5248 m TVD) in the Triassic Skagerrak Formation. The well was drilled WARP oil based mud from kick-off to TD.
A 58 m hydrocarbon column was identified in the target J62 sandstones of the Jurassic Ula Formation, from 5493 m (-5055 m TVDSS) to a Gas Down To (GDT) depth of 5565 m (5160 m TVD). Using a 9.1 % porosity cut-off, the interval consisted of 16 m net sand with an average 12 % porosity, an SW of 36 % and a net to gross of 0.17. The Triassic Skagerrak Formation was penetrated at 5587 m (5178 m TVD). Using a 9.1 % porosity cut-off, the interval consisted of 5.5m net sand with an average 10 % porosity, an SW of 76% and a net to gross of 0.08. The only oil show above the oil base mud was recorded at 5505 m to 5506 m.
No cores, formation pressure tests or wire line fluid samples were taken due to operational difficulties. A suite of logs including gamma ray, resistivity, neutron porosity, density and sonic was acquired on LWD.
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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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