NORWAY · WELLBORES · NPDID 1705
30/9-11 A
Exploration · Wildcat · P&A · Shows · Norsk Hydro Produksjon AS · PL 104
30/9-11 A is a wildcat exploration wellbore in the North Sea, drilled by Norsk Hydro Produksjon AS, entered Nov 20, 1990, to 3,002 m in the Statfjord Gp.
- 3,002
- m total depth · 2,734 m vertical
- 108
- m water depth
- Nov 20, 1990
- entered · completed Dec 29, 1990
- Statfjord Gp
- at total depth · Early Jurassic
- 39.1
- m of core in 4 cores
- —
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED MAR 1, 2026 · RELEASED DEC 29, 1992
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- VILDKAT EXPLORER · Semisub steel
- Drilling days
- 40
- Kelly bushing elevation
- 25 m
- Maximum inclination
- 0°
- Drilling permit
- 658-L
- Licensing round
- 9
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 60.32441° N, 2.92889° E
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 30/9-11 A was drilled as a sidetrack to well 30/9-11 on the J-structure on the Oseberg Sør field in the North Sea.
The vertical 30/9-11 well drilled a dry Brent group in J-East segment. The sidetrack targeted the J-Central segment and should penetrate top of the Brent Group in a down flank position in order to confirm deep oil filling of the J-Central segment, where oil previously had been discovered by well 30/9-9. The primary target was the Brent Group. Secondary target was the Cook Formation.
Operations and results
Well 30/9-11 A was kicked off from 920 m in 30/9-11 on 20 November 1990. The well was drilled with the semi-submersible installation Vildkat to TD at 3002 m (2735 m TVD) in Early Jurassic sediments of the Statfjord Group. Apart from some tight hole problems and close to seven days wait on weather operations proceeded without significant problems. The well was drilled with KCl/polymer mud from kick-off to TD.
Top Viking Group, Heather Formation was encountered at 2513 m and top Brent Group, Ness Formation was encountered at 2553 m. The Ness Formation was water bearing, however moderate oil shows with strong petroleum odour was described on cores from top off the Ness Formation down to 2570 m. These shows were confirmed by relatively high organic geochemical extract yields with oil-mature biomarkers. Poor shows were described also in Shetland Group limestone from 2455 to 2457 m and in Heather Formation claystone from 2517 to 2520 m. Otherwise there were no indications of hydrocarbons in the well.
Three cores were cut in from 2545 to 2582 m in the Heather, Tarbert, and Ness Formation. A fourth core was cut fr
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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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