NORWAY · WELLBORES · NPDID 329
15/9-11
Exploration · Appraisal · P&A · Gas/condensate · Den norske stats oljeselskap a.s · Sleipner Øst · PL 046
15/9-11 is an appraisal exploration wellbore in the North Sea, drilled by Den norske stats oljeselskap a.s, entered Sep 18, 1981, to 2,950 m in the Smith Bank Fm.
Discovery 15/9-9 Sleipner Øst · On the map →
- 2,950
- m total depth
- 88
- m water depth
- Sep 18, 1981
- entered · completed Dec 23, 1981
- Smith Bank Fm
- at total depth · Triassic
- 104.2
- m of core in 11 cores
- 107
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED DEC 23, 1983
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- ROSS RIG (1) · Semisub steel
- Drilling days
- 97
- Kelly bushing elevation
- 25 m
- Maximum inclination
- 2.20000005°
- Drilling permit
- 303-L
- Licensing round
- 3
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- No
- Position · ED50
- 58.40070° N, 1.89494° E
- Hydrocarbons in
- Heimdal Fm · Paleocene
- Hydrocarbons in
- Hugin Fm · Middle Jurassic
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 15/11-9 was drilled to appraise the 15/9-9 Sleipner Øst discovery in the south Viking Graben area of the North Sea.
The primary objective was to delineate the hydrocarbon accumulation found in the Heimdal Formation of the 15/9-Gamma structure. The secondary objective was to test for possible hydrocarbons in Triassic sandstones.
The well is Reference well for the Lista Formation, the Meile Member, and the Heimdal Formation
Operations and results
Appraisal well 15/9-11 was spudded with the semi-submersible installation Ross Rig on 18 September 1981 and drilled to TD at 2950 m in the Triassic Hegre Group. A total of 99 days including a strike was spent on this well. Apart from the strike, which amounted to 22 days of lost operation, there were no severe problems during drilling and testing operations. The well was drilled with sea water and bentonite down to 585 m and with gel/lignosulphonate/seawater mud from 585 m to TD.
The well proved gas and condensate in Heimdal formation and verified thereby the results from the 15/9-9 well. The gas- water contact was found at 2442 m. Hydrocarbons were found also in the Jurassic Hugin Formation sandstones with a gas-water contact at 2825 m. The TD for the well was then extended from 2650 to 2950 m. No hydrocarbons were found in Triassic sandstones
Eleven cores were cut in the well. Cores 1 and 2 were cut from 2364 to 2379 m in the Lista Formation. Cores 3 to 11 were cut from 2395 to 2514 m in the Heimdal Formation. The RFT tool was run on wire line and the pressure data supported communication with the 15/9-9 discovery well within the Heimdal Formation, while the Hugin Formation was in a separate pressure regime. Segregated fluid samples were taken at 2387.5 m, in the Heimdal Formation, and at 2812 and 2825.8to 2826.5 m in the Hugin Formation.
The well was permanently abandoned on 23 December 1981 as a gas/condensate appraisal well.
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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