NORWAY · WELLBORES · NPDID 9065
35/11-24 S
Exploration · Wildcat · Plugged · Oil/gas · Equinor Energy AS · PL 248 C
35/11-24 S is a wildcat exploration wellbore in the North Sea, drilled by Equinor Energy AS, entered Jul 13, 2020, to 3,200 m in the Heather Fm.
Discovery 35/11-24 S (Swisher) · On the map →
- 3,200
- m total depth · 3,113.1 m vertical
- 356
- m water depth
- Jul 13, 2020
- entered · completed Aug 9, 2020
- Heather Fm
- at total depth · Middle Jurassic
- 110
- m of core in 1 core
- 117
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED AUG 9, 2022
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- WEST HERCULES · Semisub steel
- Drilling days
- 29
- Kelly bushing elevation
- 31 m
- Maximum inclination
- 21°
- Drilling permit
- 1823-L
- Licensing round
- NST99
- Plugged and abandoned
- Aug 9, 2020
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 61.09463° N, 3.39975° E
- Hydrocarbons in
- Intra Heather Fm Ss · Late Jurassic
- Hydrocarbons in
- Intra Heather Fm Ss · Late Jurassic
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 35/11-24 S was drilled to test the Swisher prospect located on the Lomre terrace, 6km west of the Fram Vest field in the North Sea. The primary objective was to confirm commercial hydrocarbons in two Intra-Heather Formation sandstones.
Operations and results
An 8 1/2" pilot hole was drilled through cap-x down to 20" shoe setting depth at 742 m to investigate for shallow gas and water. No flow was observed.
Wildcat well 35/11-24 S was spudded with the semi-submersible installation West Hercules on 13 July 2020 and drilled to TD at 3200 m (3113.1 m TVD) m in Middle Jurassic claystone belonging to the Heather Formation. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 742 m, with Glydril mud from 742 to 1680 m, and with Versatec oil-based mud from 1680 m to TD.
The Viking Group is very thick in the well and consist mainly of claystone. The Draupne Formation from 2789 to 3003 m (2725 to 2926 m TVD) consist entirely of claystone, while the Heather Formation from 3003 m to TD is at least 180 m TVD thick and contain the two target sandstone units in the upper part, a Kimmeridgian unit and an Oxfordian unit, and massive claystone below. The upper unit was penetrated from 3012 to 3029 m (2934 to 2950 m) and the lower unit from 3073 to 3097 m (2992 to 3015 m TVD). The upper unit contain gas and the lower unit contain oil. Pressure tests show different pressure regimes in the two units, with the lower unit on a 6.5 bar lower water gradient than the upper. Oil shows were recorded in both units, but nowhere else in the well.
One core was cut from 3029 to 3139 m w
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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