30/9-19 A

Exploration · Appraisal · P&A · Oil/gas · Norsk Hydro Produksjon AS · Oseberg · PL 079

30/9-19 A is an appraisal exploration wellbore in the North Sea, drilled by Norsk Hydro Produksjon AS, entered Oct 28, 1998, to 3,775 m in the Drake Fm.

Discovery 30/9-19 · On the map →

3,775: m total depth · 3,632 m vertical
105: m water depth
Oct 28, 1998: entered · completed Dec 21, 1998
Drake Fm: at total depth · Early Jurassic
41.5: m of core in 1 core
132: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED DEC 21, 2000

On file for this wellbore

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

Drilling

Drilling facility: WEST DELTA · Semisub steel
Drilling days: 55
Kelly bushing elevation: 29 m
Maximum inclination: 36°
Drilling permit: 942-L
Licensing round: Awarded additionally to round 6
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position: 60.45983° N, 2.69415° E
Hydrocarbons in: Tarbert Fm · Middle Jurassic

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 30/9-19 A is a geological sidetrack to well 30/9-19 on the Delta structure west of the Oseberg Field in the North Sea. Well 30/9-19 found gas and oil in two separately pressured compartments within the Tarbert Formation. The objective of the sidetrack was to test the hydrocarbon potential in the deltaic sands of the Tarbert Formation in the DeltaS1 structure, west of the structure drilled by the primary 30/9-19 well bore.

Operations and results

Appraisal well 30/9-19 A was kicked off from 2322 m in well 30/9-19 on 28 October 1998. The semi-submersible installation West Delta drilled the sidetrack to TD at 3775 m (3632 m TVD) in the Early Jurassic Drake Formation. Drilling proceeded without significant problems using ANCO 2000 mud from kick-off to TD.

Top Tarbert Formation was penetrated at 3210 m (3127 m TVD). The upper part of the Tarbert Formation down to 3277 m (Tarbert 4) is tight with no pay, while the section from 3277 m to 3310 m (Tarbert 3) has only 2 m net pay. The Tarbert 2 main reservoir was penetrated at 3310.5 m (3208.5 m TVD). The gradients from MDT pressure points showed that gas, oil and water are present in the Tarbert 2 reservoir with densities respectively 0.25 g/cc, 0.66 g/cc and 0.99 g/cc. Between the gas and the oil columns there is a carbonate-cemented layer. The gas and oil columns are not in pressure communication and a gas down to is set to 3344 m MD (3235.8 m TVD) and an oil up to at 3347.5 m (3238.7 m TVD). The oil water contact was observed from logs at 3368 m (3255.5 m TVD). The oil column is thus 16.8 m TVD thick. The only oil show outside of the hydrocarbon-bearing reservoir was recorded on sandstone cuttings at 3710 m.

One core was cut

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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