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Generated 11.02.2012 |
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| NPDID wellbore: | 4463 | |
| Well name: | 30/9-20 | |
| Drilling operator name: | Norsk Hydro Produksjon AS | |
| Geodetic datum: | ED50 | |
| Coordinates: | 60° 19` 01.67`` N | 2° 48` 03.38`` E |
| UTM coordinates: | 6686903.78 N | 489002.73 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 104 | |
| Area: | NORTH SEA | |
| Discovery: | 30/9-20 S | |
| Field: | OSEBERG SØR | |
| Drill permit: | 1028-L | |
| Drilling facility: | TRANSOCEAN ARCTIC | |
| Drilling days: | 33 | |
| Wellbore entry date: | 09.01.2002 | |
| Wellbore completion date: | 11.02.2002 | |
| Original wellbore purpose: | WILDCAT | |
| Wellbore purpose: | WILDCAT | |
| Wellbore status: | P&A | |
| Wellbore contents: | OIL | |
| Discovery wellbore: | YES | |
| Formation/age with hydrocarbons 1: | INTRA HEATHER FM SS / LATE JURASSIC | |
| Formation/age with hydrocarbons 2: | TARBERT FM / MIDDLE JURASSIC | |
| Seismic location: | NH-9356-118/NH-9356-318 | |
| Kelly bushing elevation (KB) [m]: | 24 | |
| Water depth [m]: | 101 | |
| Total Depth (MD) [m]: | 3124 | |
| Final vertical depth (TVD) [m]: | 3096 | |
| Max inclination [°]: | 16.30 | |
| Bottom hole temperature [°C]: | 125 | |
| Oldest penetrated age: | EARLY JURASSIC | |
| Oldest penetrated formation: | DRAKE FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
The well 30/9-20 S was an exploration well, located in the Oseberg S&r field area, in block 30/9 on the R prospect of the PL104 Oseberg S&r Unit. The main objectives of the well was to prove oil and/or gas in The Brent
deltaic sands of the Tarbert Formation, and additional potential within the Ness and Oseberg-Rannoch-Etive Formations, and to confirm the seismic interpretation. The R prospect is located between the K-west and the Omega structures.
Operations and results
Well 30/9-20 S was spudded with the semi-submersible installation Transocean Arctic on 9 January 2002 and reached a total depth of 3124 m in the Early Jurassic Drake Formation. The well was drilled with spud mud down to 400 m, with KCl/Polymer mud from 400 m to 870 m, with KCl/Polymer/Glycol mud from 870 m to 1297 m, and with Versavert oil based mud from 1297 m to TD.
A total gross hydrocarbon column of 65.8 m TVD was found in the Tarbert Formation and in Intra Heather Formation Sandstone, of this 10.8 m in the Intra Heather Sandstone. The gross oil column was separated in two independent zones separated by a calcite barrier at ca 2796 m. A pressure barrier (0.5 bar) was interpreted internally between the two oil zones. A total of 72,65 m core was recovered from 2791 m to 2864 m over the major sandstone interval. The core shows a homogeneous, generally fine-grained sand sequence that is both silica and calcareous cemented. The Intra Heather Formation Sandstone represents fair reservoir quality while Tarbert represents a poor, low permeability reservoir. MDT fluid samples were taken in the oil zone at 2766.5 m and 2807 m, and in the water zone at 2868 m. Analyses on the rig as well as later geochemical analyses on shore showed that the samples were of good quality, not significantly affected by mud contamination. The well was permanently abandoned as an oil discovery on 11 February 2002.
Testing
No drill stem test was performed
Interval [m]: 425.00 - 3123.00
Core length [m]: 72.65
| Core number | Interval |
|---|---|
| 1 | 2791.00-2826.50 |
| 2 | 2826.50-2863.65 |
No scanned core photos available
No oil samples available.
| Type | Casing diam. [inch] | Depth below KB [m] | Hole diam. [inch] | Hole depth below KB [m] | Lot mud eqv. [g/cm3] |
|---|---|---|---|---|---|
| CONDUCTOR | 30 | 198.0 | 36 | 200.0 | |
| INTERM. | 20 | 398.0 | 26 | 400.0 | 1.51 |
| LINER | 16 | 621.0 | 20 | 630.0 | |
| INTERM. | 13 3/8 | 1291.0 | 17 1/2 | 1297.0 | 1.68 |
| INTERM. | 9 5/8 | 2362.0 | 12 1/4 | 2369.0 | 1.60 |
| OPEN HOLE | 3124.0 | 8 1/2 | 3124.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 198 | 1.03 | WATER BASED | |||
| 400 | 1.50 | WATER BASED | |||
| 600 | 1.30 | 20.0 | WATER BASED | ||
| 623 | 1.30 | 20.0 | WATER BASED | ||
| 1297 | 1.21 | 15.0 | WATER BASED | ||
| 1585 | 1.45 | 36.0 | OIL BASED | ||
| 1596 | 1.45 | 35.0 | OIL BASED | ||
| 2369 | 1.45 | 37.0 | OIL BASED | ||
| 2370 | 1.30 | 31.0 | OIL BASED | ||
| 2864 | 1.30 | 28.0 | OIL BASED | ||
| 3124 | 1.30 | 28.0 | OIL BASED |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| MWD - PP CDR | 125 - 2369 |
| MWD - RAB VPP ADN | 2369 - 3124 |
| AIT IPLT | 2362 - 3124 |
| GR MSCT | 747 - 2975 |
| GR VSP | 2040 - 3124 |
| GR MDT | 2746 - 2934 |
| GR DSI OBMI | 2000 - 3124 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 125 | NORDLAND GP |
| 590 | NO FORMAL NAME |
| 607 | NORDLAND GP |
| 665 | UTSIRA FM |
| 843 | HORDALAND GP |
| 902 | NO FORMAL NAME |
| 920 | HORDALAND GP |
| 960 | SKADE FM |
| 991 | HORDALAND GP |
| 1215 | SKADE FM |
| 1247 | HORDALAND GP |
| 1300 | SKADE FM |
| 1340 | HORDALAND GP |
| 1436 | GRID FM |
| 1449 | HORDALAND GP |
| 1579 | GRID FM |
| 1613 | HORDALAND GP |
| 2075 | ROGALAND GP |
| 2075 | BALDER FM |
| 2132 | SELE FM |
| 2181 | LISTA FM |
| 2283 | VÅLE FM |
| 2361 | SHETLAND GP |
| 2361 | HARDRÅDE FM |
| 2588 | KYRRE FM |
| 2629 | SVARTE FM |
| 2703 | CROMER KNOLL GP |
| 2703 | RØDBY FM |
| 2734 | ÅSGARD FM |
| 2750 | VIKING GP |
| 2750 | DRAUPNE FM |
| 2751 | INTRA HEATHER FM SS |
| 2806 | BRENT GP |
| 2806 | TARBERT FM |
| 2923 | NESS FM |
| 3072 | DUNLIN GP |
| 3072 | DRAKE FM |
No composite log presently available.
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