NORWAY · WELLBORES · NPDID 8633
35/4-2
Exploration · Wildcat · P&A · Dry · Wellesley Petroleum AS · PL 931
35/4-2 is a wildcat exploration wellbore in the North Sea, drilled by Wellesley Petroleum AS, entered Jan 21, 2019, to 771 m in the Naust Fm.
- 771
- m total depth · 771 m vertical
- 391
- m water depth
- Jan 21, 2019
- entered · completed Feb 16, 2019
- Naust Fm
- at total depth · Pliocene
- —
- m of core
- —
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED JAN 5, 2021
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- TRANSOCEAN ARCTIC · Semisub steel
- Drilling days
- 27
- Kelly bushing elevation
- 24 m
- Maximum inclination
- 0°
- Drilling permit
- 1742-L
- Licensing round
- TFO2017
- Plugged and abandoned
- Feb 16, 2019
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 61.60071° N, 3.20534° E
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 35/4-2 was drilled to test the Songesand in the Mardoll Sub-basin, about 6 km south of the Peon discovery in the North Sea. The primary objective was to explore the shallow biogenic gas potential in intra Pliocene sand in the Naust Formation.
Operations and results
A 9 7/8” pilot hole 35/4-U-1 was drilled to 694 m, the 35/4-2 surface casing setting depth, to identify possible shallow gas, calibrate depth prognosis and reduce top reservoir depth uncertainty. No shallow gas or water flow was observed.
Wildcat well 35/4-2 was spudded with the semi-submersible installation Transocean Arctic on 21 January 2019 and drilled to TD at 771 m in the Pliocene Naust Formation. Ca 8.5 days wait-on-weather. Otherwise operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 480 m and with KCl/GEM/polymer mud from 480 m to TD.
The well penetrated a Pleistocene sand from 532 to 552 m with slightly elevated mud gas. No intra-Pliocene sand was encountered. The well is dry.
No cores were cut. No fluid sample was taken.
The well was plugged and abandoned on 8 February 2019, but left location 8 days later due to weather conditions. It is classified as a dry well.
Testing
No drill stem test was performed.
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.
Developers: this page as JSON is GET /v1/data/norway/wells/8633, documented in the API reference.