25/8-21 S

Exploration · Appraisal · P&A · Oil/gas · MOL Norge AS · PL 820 S

25/8-21 S is an appraisal exploration wellbore in the North Sea, drilled by MOL Norge AS, entered May 13, 2021, to 2,703 m in the Basement.

Discovery 25/8-19 S (Iving) · On the map →

2,703: m total depth · 2,627 m vertical
128: m water depth
May 13, 2021: entered · completed Jun 20, 2021
Basement: at total depth · Pre-Devonian
109.8: m of core in 2 cores
105: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED JUL 11, 2026 · RELEASED JUN 20, 2023

On file for this wellbore

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Drilling

Drilling facility: TRANSOCEAN BARENTS · Semisub steel
Drilling days: 39
Kelly bushing elevation: 40 m
Maximum inclination: 20.60000038°
Drilling permit: 1857-L
Licensing round: TFO2015
Plugged and abandoned: Jun 20, 2021
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 59.32910° N, 2.34031° E
Hydrocarbons in: Skagerrak Fm · Late Triassic
Hydrocarbons in: Basement

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 25/8-21 S was drilled to appraise the Skagerrak Formation Iving oil discovery made in well 25/8-19 S and 25/8-19 A. The Iving discovery is located at the northern part of the Utsira High in the North Sea. The primary objective of the appraisal well was to establish the oil-water contact in the Triassic Skagerrak Formation in Segment 1 of the Iving structure. The well was planned to penetrate 50 m into pre-Permian basement.

Operations and results

Appraisal well 25/8-21 S was spudded with the semi-submersible installation Transocean Barents on 13 May 2021 and drilled to TD at 2703 m (2627 m TVD) m in Basement rock. The well is vertical down to 1000 m, building to a ca 19 sail angle from ca 1450 m to TD. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 1040 m and with Innovert oil-based mud from 1040 m to TD.

Top Skagerrak Formation/BCU was penetrated at 2390.5 m. The middle Skagerrak Formation contained gas over oil in sandstones of poor to good reservoir quality. The gas/oil and oil/water contacts were derived from pressure gradients to be at 2511.5 m (2445.5 m TVD) and 2534.3 m (2467.4 m TVD), respectively. Pressure data indicates communication in the Skagerrak reservoir between the discovery (25/8-19 S & A) and the appraisal well.

Oil was also encountered in the lower part of the Skagerrak Formation with an oil sample at 2633 m (2561 m TVD), and a separate oil column of about 50 metres was encountered in basement rock. The reservoir properties in the Lower Skagerrak and in the Basement was poor and hydrocarbon contacts were not established. Oil shows, mostly discontinuous, were recorded from 2522 m and

Around this wellbore

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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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