30/9-3 A

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

30/9-3 A is an appraisal exploration wellbore in the North Sea, drilled by Norsk Hydro Produksjon AS, entered Feb 26, 1984, to 4,300 m in the Lunde Fm.

Discovery 30/9-3 Oseberg Sør · On the map →

4,300: m total depth · 4,008 m vertical
111: m water depth
Feb 26, 1984: entered · completed May 20, 1984
Lunde Fm: at total depth · Late Triassic
196: m of core in 14 cores
138: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED MAY 20, 1986

On file for this wellbore

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

Drilling

Drilling facility: NORTRYM · Semisub steel
Drilling days: 85
Kelly bushing elevation: 25 m
Maximum inclination: 35.5°
Drilling permit: 406-L
Licensing round: Awarded additionally to round 6
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 60.47120° N, 2.76043° E
Hydrocarbons in: Ness Fm · Middle Jurassic

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 30/9-3 A is a sidetrack to well 30/9-3 on the Gamma West structure on the Oseberg Fault Block in the northern North Sea. The primary objective of 30/9-3 was to find hydrocarbon accumulations in the Middle Jurassic Brent Group. Secondary objective was to find additional hydrocarbon accumulations in the Early Jurassic. Planned TD was ca 75 m below a possible intra Triassic marker to a depth of 4188 +/- 100 m. Well 30/9-3 discovered oil in the Brent Group, but reached only 3113 m in the Drake Formation due to fish in the hole. For the same reason no wire line logs were run below 1713.5 m.

Sidetrack well 30/9-3 A was drilled to complete the well programme.

Operations and results

Well 30/9-3 A was kicked off on 26 February 1984, from a window from 1539 to 1562 m in the 13 3/8" casing. The well was drilled to TD at 4300 m (4008 m TVD) in the Late Triassic Lunde Formation using the semi-submersible installation Nortrym. No significant problem was encountered in the operations. The well was drilled with Invermul/EZmul Oil Based Mud from kick-off to TD.

The Ness Formation (2853.5 - 3059 m, 2717.3 - 2890 m TVD) was encountered at a horizontal distance of 538 m to the west of the 30/9-3 well. The top of the formation had been subjected to erosion and lacked the sandstone units which were found in the upper part of the 30/9-3 well. The lithology was alternating sandstones, siltstones and shales with beds of coal. The sandstones were generally very fine to fine grained, locally medium grained, and occurred often as normally graded beds.

The Ness Formation was found oil bearing down to 3000 m (2840m TVD). No oil/water contact c

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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