Generated 10.02.2012
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Generated 10.02.2012 |
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| NPDID wellbore: | 372 | |
| Well name: | 25/11-12 | |
| Drilling operator name: | Esso Exploration and Production Norway A/S | |
| Geodetic datum: | ED50 | |
| Coordinates: | 59° 12` 02.61`` N | 2° 22` 50.81`` E |
| UTM coordinates: | 6562719.11 N | 464630.25 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 001 | |
| Area: | NORTH SEA | |
| Discovery: | 25/11-1 BALDER | |
| Field: | BALDER | |
| Drill permit: | 281-L | |
| Drilling facility: | GLOMAR BISCAY II | |
| Drilling days: | 20 | |
| Wellbore entry date: | 18.04.1981 | |
| Wellbore completion date: | 07.05.1981 | |
| Original wellbore purpose: | APPRAISAL | |
| Wellbore purpose: | APPRAISAL | |
| Wellbore status: | P&A | |
| Wellbore contents: | SHOWS | |
| Discovery wellbore: | NO | |
| Seismic location: | BALMG 173 SP: 240. | |
| Kelly bushing elevation (KB) [m]: | 25 | |
| Water depth [m]: | 127 | |
| Total Depth (MD) [m]: | 1918 | |
| Final vertical depth (TVD) [m]: | 1918 | |
| Max inclination [°]: | 1.40 | |
| Bottom hole temperature [°C]: | 60 | |
| Oldest penetrated age: | PALEOCENE | |
| Oldest penetrated formation: | EKOFISK FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 25/11-12 was drilled to appraise the Balder Field on the Utsira High in the North Sea. The objective was to establish the presence of a thick accumulation of oil sand in the north-eastern part of the Balder Field, and evaluate the geologic concept of sand-shale distribution and the reservoir quality of the Paleocene sands. The top of the reservoir was anticipated to be at 1717 m TVD MSL.
Operations and results
Appraisal well 25/11-12 was spudded with the semi-submersible installation Glomar Biscay II on 18 April 1981 on and drilled to TD at 1918 m in the Danian age chalk of the Ekofisk Formation. The well was drilled with seawater/gel/Lignosulphonate mud.
The Sele Formation had thin stringers of sand with oil shows, but no significant Paleocene sands were developed above the Heimdal Formation in this well. Massive Paleocene Heimdal Formation sands were encountered at 1784.5 m (1759.5 m TVD MSL) and 1860 m (1835 m TVD MSL). The upper sand is 65 m thick and had oil shows evident by sidewall cores at 1785 m and 1786 m. The lower sand is 20 m thick and was entirely water-bearing with no shows. The Balder Field oil/water contact is generally thought to be at 1785 m (1760 m).
No cores were cut and no wire line fluid samples were taken.
The well was permanently abandoned on 7 May 1981as a dry well with shows.
Testing
No drill stem test was performed.
Interval [m]: 230.00 - 1914.00
No cores in this wellbore.
No scanned core photos available
No palynological slides in this wellbore.
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 | 226.0 | 36 | 226.0 | |
| INTERM. | 13 3/8 | 446.5 | 17 1/2 | 460.0 | 1.77 |
| INTERM. | 9 5/8 | 1301.0 | 12 1/4 | 1315.0 | 1.75 |
| OPEN HOLE | 1918.0 | 8 1/2 | 1918.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 340 | 1.08 | 47.0 | waterbased | ||
| 770 | 1.10 | 40.0 | waterbased | ||
| 1450 | 1.18 | 45.0 | waterbased | ||
| 1840 | 1.19 | 46.0 | waterbased |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| IEL BHC AC GR SP | 150 - 1917 |
| DLL MLL GR | 1295 - 1918 |
| DEN NEU GR | 1290 - 1918 |
| DIPLOG | 1295 - 1917 |
| SWC | 1595 - 1909 |
| VELOCITY | 150 - 1918 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 152 | NORDLAND GP |
| 589 | UTSIRA FM |
| 726 | NO FORMAL NAME |
| 749 | HORDALAND GP |
| 749 | SKADE FM |
| 971 | NO FORMAL NAME |
| 994 | SKADE FM |
| 1016 | NO FORMAL NAME |
| 1243 | SKADE FM |
| 1290 | NO FORMAL NAME |
| 1675 | ROGALAND GP |
| 1675 | BALDER FM |
| 1731 | SELE FM |
| 1751 | LISTA FM |
| 1785 | HEIMDAL FM |
| 1890 | VÅLE FM |
| 1904 | SHETLAND GP |
| 1904 | EKOFISK FM |
No composite log presently available.
No geochemical data presently available. Regional geochemical studies which include data from this well may however be filed on a different well.
| 11_12_Completion_Log | (Format:PDF. Size: 1.143 Mb ) |
| 11_12_Completion_Report | (Format:PDF. Size: 6.081 Mb ) |
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| WDSS_General_Information | (Format:PDF. Size: 0.130 Mb ) |
| WDSS_completion_log | (Format:PDF. Size: 0.149 Mb ) |
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