NORWAY · WELLBORES · NPDID 1989
30/9-B-18
Development · Observation · Plugged · Not applicable · Norsk Hydro Produksjon AS · Oseberg · PL 079
30/9-B-18 is an observation development wellbore in the North Sea, drilled by Norsk Hydro Produksjon AS, entered Jul 10, 1992, to 3,980 m in the Drake Fm.
Discovery 30/6-1 Oseberg · On the map →
- 3,980
- m total depth · 2,814 m vertical
- 109
- m water depth
- Jul 10, 1992
- entered · completed Sep 25, 1992
- Drake Fm
- at total depth · Early Triassic
- 42.5
- m of core in 2 cores
- —
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED SEP 2, 2026 · RELEASED SEP 25, 1994
On file for this wellbore
What the Directorate holds from this wellbore. Each opens the section that lists it.
Drilling
- Drilling facility
- OSEBERG B · Jacket 8 legs
- Drilling days
- 53
- Kelly bushing elevation
- 58 m
- Maximum inclination
- 52.70000076°
- Drilling permit
- 726-P
- Licensing round
- Awarded additionally to round 6
- Plugged and abandoned
- Sep 25, 1992
- Core samples available
- Yes
- Cuttings samples available
- Yes
- Position · ED50
- 60.49342° N, 2.82867° E
- Hydrocarbons in
- Brent Gp
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 30/9-B-18 was drilled as a development well on the 30/9-1 Oseberg Discovery in the North Sea. It was drilled as a penetration well prior to the horizontal well 30/9-B-18 A. The objective was to accurately locate the oil/water contact in the Oseberg Formation and to give structural information and exact target depth for the horizontal section of the production well 30/9-B-18 A.
The NSO-1 geochemical standard oil was produced from 30/9-B-18 A.
Operations and results
Development well 30/9-B-18 was spudded on 10 June 1992. It was drilled from the Oseberg B platform to TD at 3980 m (2814 m TVD) m in the Early Jurassic Drake Formation. The target of the well was on the Oseberg Alpha Structure approximately 2.5 km south-east of the Oseberg B platform. Serious hole cleaning problems were evident throughout the 12 1/4" section, causing a sidetrack from 1448 m. The well was drilled with spud mud down to 1155 m, with ANCO 2000 mud from 1155 to 3342 m, and with oil based Safemul mud from 3342 m to TD.
The well drilled through a 121 metres vertical section of the Brent Group, which is 10 metres more than prognosed, and the oil-water contact was established at 3878 m MD (2767 m TVD). Good shows were observed on the cores from the Oseberg Formation, otherwise no shows descriptions were reported from the well. RFT pressure points proved an 11 bar depleted oil gradient compared to the initial Oseberg-Rannoch-Etive gradient in the Alpha structure.
Two cores were cut in succession from 3859 to 3903 m in the Oseberg Formation. The core-log depth shift is +2 m for both cores. The RFT was run on wireline to record pressure points in the
Around this wellbore
This wellbore on Sodir FactPages →
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.
Developers: this page as JSON is GET /v1/data/norway/wells/1989, documented in the API reference.