35/9-4 S

Exploration · Appraisal · Junked · Not applicable · Norsk Hydro Produksjon AS · Gjøa · PL 153

35/9-4 S is an appraisal exploration wellbore in the North Sea, drilled by Norsk Hydro Produksjon AS, entered Jul 13, 1998, to 1,261 m in the Lista Fm.

Discovery 35/9-2 · On the map →

1,261: m total depth · 1,261 m vertical
364: m water depth
Jul 13, 1998: entered · completed Aug 12, 1998
Lista Fm: at total depth · Paleocene
—: m of core
—: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED AUG 12, 2000

On file for this wellbore

What the Directorate holds from this wellbore. Each opens the section that lists it.

Drilling

Drilling facility: TRANSOCEAN LEADER · Semisub steel
Drilling days: 31
Kelly bushing elevation: 23.5 m
Maximum inclination: 0°
Drilling permit: 930-L
Licensing round: 12
Plugged and abandoned: Aug 12, 1998
Core samples available: No
Cuttings samples available: No
Position · ED50: 61.32569° N, 3.96534° E

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 35/9-4 S was the sixth exploration well in the license and should appraise the hydrocarbon potential of the A South structure on the Gj øa Discovery. The primary target was sands of the Sognefjord and Fensfjord Formations, which were expected to be in full internal communication and with common fluid contacts.

Operations and results

Well 35/9-4 S was spudded with the semi-submersible installation Transocean Leader on 13 July 1998 and drilled to TD at 1261 m in the Paleocene Lista Formation. A 36" hole was drilled to 451 m, and the 30" conductor set at 449 m. The 17 1/2" hole section was drilled riserless to 1261 m. During running of the 13 3/8" casing, water flow was observed in the wellhead area. The casing was set at 1255.5 m, and the riser and BOP were installed. The water flow increased in magnitude and amount, and a successful killing operation was carried out. The well was drilled with seawater and hi-vis pills from top to TD.

The well objective was not fulfilled as the well was terminated due to the shallow water flow. The source of the shallow water flow was found to be a quaternary sand-rich interval between 559 m and 600 m, and with a significant contribution from an intra Lista Formation sand at 903 m. No cores were cut and no fluid samples taken in the well.

The well was permanently abandoned on 12 August 1998 as a junked well.

Testing

No drill stem test was performed

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.

Developers: this page as JSON is GET /v1/data/norway/wells/3524, documented in the API reference.