NORWAY · WELLBORES · NPDID 7771
35/11-18
Exploration · Wildcat · P&A · Oil · Wintershall Norge AS · PL 248
35/11-18 is a wildcat exploration wellbore in the North Sea, drilled by Wintershall Norge AS, entered Aug 19, 2015, to 3,759 m in the Cook Fm.
Discovery 35/11-18 (Syrah) · On the map →
- 3,759
- m total depth · 3,740 m vertical
- 366
- m water depth
- Aug 19, 2015
- entered · completed Sep 27, 2015
- Cook Fm
- at total depth · Early Jurassic
- 54.1
- m of core in 1 core
- 145
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED SEP 27, 2017
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- BORGLAND DOLPHIN · Semisub steel
- Drilling days
- 40
- Kelly bushing elevation
- 31 m
- Maximum inclination
- 15.69999981°
- Drilling permit
- 1593-L
- Licensing round
- NST99
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 61.15678° N, 3.34391° E
- Hydrocarbons in
- Intra Heather Fm Ss · Late Jurassic
- Hydrocarbons in
- Tarbert Fm · Middle Jurassic
- Hydrocarbons in
- Oseberg Fm · Middle Jurassic
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 35/11-18 was drilled to test the Syrah prospect on the Marflo Spur/Lomre Terrace, west of the Vega Field in the North Sea. The primary objective was to test the hydrocarbon potential in the Middle Jurassic Brent Group. The secondary target was to test the hydrocarbon potential in Intra Heather Formation sandstone.
Operations and results
Wildcat well 35/11-18 was spudded with the semi-submersible installation Borgland Dolphin on 19 August 2015 and drilled to TD at 3759 m (3740 m TVD) in the Early Jurassic Cook Formation. The Syrah 35/11-18 well was planned and executed as a vertical well with short deviated section below ca 3000 m through the main reservoir targets. The deviation was ca 15° from ca 3300 m to TD. No significant problem was encountered in the operations. The well was drilled with seawater down to 494 m, with KCl/Polymer/GEM mud from 494 m to 1111 m, with Performadril mud from 1111 m to 1742 m and with Innovert NS oil based mud from 1742 m to TD.
Top Draupne Formation was encountered at 3037 m and top Heather Formation came in at 3098 m. An Intra Heather Formation sandstone unit was penetrated from 3205 to 3247 m. The unit has ca 5 m gross hydrocarbon-filled sandstone in two sandstone beds on top, otherwise it consists of siltstone, claystone and limestone. Top Tarbert Formation came in at 3491 m with hydrocarbons in the topmost few meters. The Ness and Etive formations were water wet. Top Oseberg Formation came in at 3657 m with oil in the top 2 meters. Weak oil shows were described on the core from the Tarbert Formation down to 3550 m, and on cuttings over the interval 3657 to 3664 m.
One 54 m core was cut from 3498 m to 3552 m in the Middle Jurassic Tarbert
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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