NORWAY · WELLBORES · NPDID 7813
35/11-18 A
Exploration · Appraisal · P&A · Oil/gas · Wintershall Norge AS · PL 248
35/11-18 A is an appraisal exploration wellbore in the North Sea, drilled by Wintershall Norge AS, entered Sep 27, 2015, to 4,020 m in the Statfjord Gp.
Discovery 35/11-18 (Syrah) · On the map →
- 4,020
- m total depth · 3,905 m vertical
- 366
- m water depth
- Sep 27, 2015
- entered · completed Dec 16, 2015
- Statfjord Gp
- at total depth · Early Jurassic
- 53.5
- m of core in 1 core
- 151
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED DEC 16, 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
- 80
- Kelly bushing elevation
- 31 m
- Maximum inclination
- 24.5°
- Drilling permit
- 1604-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
- Brent Gp · Middle Jurassic
- Hydrocarbons in
- Cook Fm · Early Jurassic
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 35/11-18 A is a geological sidetrack to well 35/11-18 on the Marflo Spur/Lomre Terrace, west of the Vega Field in the North Sea. Well 35/11-18 made hydrocarbon discoveries in Intra-Heather Formation sandstone, in the Tarbert Formation and in the Oseberg Formation. The overall objective was to appraise the 35/11-18 Syrah discovery. The primary target was to prove commercial volumes of hydrocarbons in the Tarbert-Upper Ness, Lower Ness-Etive, Oseberg and Cook formations. The secondary target was to penetrate and prove hydrocarbons in the Late Jurassic Intra-Heather Formation sandstone.
Operations and results
Appraisal well 30/11-18 A kicked off from 1775 m in well 30/11-18 on 27 September 2015. It was drilled with the semi-submersible installation Borgland Dolphin to 4020 m (3905 m TVD) in the Early Jurassic Statfjord Group. Technical problems during DST led to a week downtime. Otherwise no significant problem was encountered in the operations. The well was drilled with Innovert oil based mud from kick-off to TD.
Top Draupne Formation was penetrated at 3088 m (3005 m TVD). As in the main bore, clear hydrocarbon shows and increased gas values were seen on penetrating the Late Jurassic Heather Formation. A 35 m thick Intra-Heather Formation sandstone of Kimmeridgian age proved to be gas filled with a GDT. Further, thin Oxfordian aged Intra-Heather Formation sandstones in this formation proved oil-filled. Both Kimmeridgian and Oxfordian sandstones had an average porosity of 13.6 % when using a 10 % cut off. No oil-water contact was established (ODT). Top Brent Group, Tarbert Formation was penetrated at 3540 m (3437 m TVD). All Brent Group reservoirs were oil-filled, as well as the Early Jurassic Cook Formation. Pressure measure
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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