25/5-7

Exploration · Wildcat · P&A · Gas/condensate · Total E&P Norge AS · Atla · PL 102 C

25/5-7 is a wildcat exploration wellbore in the North Sea, drilled by Total E&P Norge AS, entered Aug 25, 2010, to 3,045 m in the Hegre Gp.

Discovery 25/5-7 Atla · On the map →

3,045: m total depth · 3,045 m vertical
119: m water depth
Aug 25, 2010: entered · completed Oct 23, 2010
Hegre Gp: at total depth · Late Triassic
54.2: m of core in 1 core
110: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED OCT 23, 2012

On file for this wellbore

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

Drilling

Drilling facility: OCEAN VANGUARD · Semisub steel
Drilling days: 60
Kelly bushing elevation: 22 m
Maximum inclination: 2.20000005°
Drilling permit: 1318-L
Licensing round: 9
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 59.66202° N, 2.57094° E
Hydrocarbons in: Brent Gp · Middle Jurassic

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 25/5-7 was drilled on the David prospect on the north-eastern part of the Heimdal Terrace in the North Sea. The primary objective was to investigate the hydrocarbon potential of the Brent and Statfjord reservoirs. Secondary objective was sands in the Tertiary section.

Operations and results

Wildcat well 25/5-7 was spudded with the semi-submersible installation Ocean Vanguard on 23 September 2010 and drilled to TD at 3045 m in the Late Triassic Hegre Group. Due to shallow gas low risk, a 9"7/8 pilot hole was drilled first and was opened to 17"1/2. No shallow gas was encountered, but several tight spots were encountered while drilling and opening up this section. At 438 m the rig experienced a power shutdown. The rig was on repair from 31 August 2010 until the 4 September (123.75 hrs NPT). The well was drilled with seawater and hi-vis sweeps down to 1160 m and with oil based mud ("non-aqueous based mud") from 1160 m to TD.

The well penetrated a massive Ty sand and minor Lista/Heimdal sands, while no Hermod sand was encountered. All potential reservoirs in the Tertiary were found water bearing. The well encountered the Middle Jurassic Brent sandstones at 2684 m, 40 m shallower than prognosed. The thickness of the Brent was 27.5m, 45m less than expected. The Brent reservoir was found gas bearing. The Statfjord was also encountered 40 m shallow to prognosis, but with a thickness of 135m, close to the prognosis. The Statfjord was found water wet. Petrophysical interpretation indicated that the Brent reservoir has a net-to-gross of 93%, an average e

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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