25/8-17 A

Exploration · Appraisal · P&A · Oil · ExxonMobil Exploration and Production Norway AS · Jette · PL 027 D

25/8-17 A is an appraisal exploration wellbore in the North Sea, drilled by ExxonMobil Exploration and Production Norway AS, entered Oct 30, 2009, to 2,945 m in the Ty Fm.

Discovery 25/8-17 Jette · On the map →

2,945: m total depth · 2,179 m vertical
127: m water depth
Oct 30, 2009: entered · completed Nov 15, 2009
Ty Fm: at total depth · Paleocene
—: m of core
—: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED NOV 15, 2011

On file for this wellbore

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

Drilling

Drilling facility: BREDFORD DOLPHIN · Semisub steel
Drilling days: 17
Kelly bushing elevation: 25 m
Maximum inclination: 66.19999695°
Drilling permit: 1288-L
Licensing round: 2-A
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 59.39226° N, 2.33394° E
Hydrocarbons in: Heimdal Fm · Paleocene

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 25/8-17 A is a sidetrack to the Jetta well 25/8-17 south of the Jotun Field in the North Sea. Well 25/8-17 discovered oil in thin Paleocene Heimdal Formation sandstones. The objective of the sidetrack was to test thicker Heimdal sands, believed to be developed towards the north-east of the primary well bore. TD of the sidetrack was planned to be approximately 25 m into the first water bearing sand of the Ty Formation.

Operations and results

Appraisal well 25/8-17 A was kicked off from the main wellbore, 25/8-17 on 30 October 2009, using the semisubmersible installation Bredford Dolphin. The kick-off point was at 1104 and the well was drilled without significant problems to 2945 m (2179 m TVD) in the Late Paleocene Ty Formation. The well was drilled with XP-07 oil based mud from kick-off to TD.

The target Heimdal formation was encountered at 2693.94 m (2051 m TVD). The upper part consisted mostly of claystones. Sandstones were penetrated from 2752 m (2075 m TVD) and were found to be hydrocarbon bearing with gas in the upper sand and oil further down. The sands had varying quality, and were partly calcite cemented, but Heimdal contained a massive oil bearing sandstone at 2763 m with excellent reservoir properties as in the main well, with porosity up to 30 % and oil saturation of about 78%. No GOC could be defined from the logs, but the well results were consistent with GOC at 2057 m TVD MSL in the area. No additional information about the OWC could be defined from the well. In the main well a range in OWC from 2086 to 2091 m TVD MSL was defined. Due to OBM being used, no visual shows were seen in the sandstones in the Heimdal Formation, despite having indications that hydr

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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