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Generated 10.02.2012 |
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| NPDID wellbore: | 373 | |
| Well name: | 25/11-13 | |
| Drilling operator name: | Esso Exploration and Production Norway A/S | |
| Geodetic datum: | ED50 | |
| Coordinates: | 59° 11` 26.88`` N | 2° 23` 23.80`` E |
| UTM coordinates: | 6561609.08 N | 465143.57 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 001 | |
| Area: | NORTH SEA | |
| Discovery: | 25/11-1 BALDER | |
| Field: | BALDER | |
| Drill permit: | 287-L | |
| Drilling facility: | GLOMAR BISCAY II | |
| Drilling days: | 20 | |
| Wellbore entry date: | 10.05.1981 | |
| Wellbore completion date: | 29.05.1981 | |
| Original wellbore purpose: | APPRAISAL | |
| Wellbore purpose: | APPRAISAL | |
| Wellbore status: | P&A | |
| Wellbore contents: | OIL | |
| Discovery wellbore: | NO | |
| Formation/age with hydrocarbons 1: | INTRA BALDER FM SS / EOCENE | |
| Formation/age with hydrocarbons 2: | HEIMDAL FM / PALEOCENE | |
| Seismic location: | BALMG 188 SP: 261. | |
| Kelly bushing elevation (KB) [m]: | 25 | |
| Water depth [m]: | 127 | |
| Total Depth (MD) [m]: | 1932 | |
| Final vertical depth (TVD) [m]: | 1932 | |
| Max inclination [°]: | 3.00 | |
| Bottom hole temperature [°C]: | 55 | |
| Oldest penetrated age: | LATE CRETACEOUS | |
| Oldest penetrated formation: | TOR FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 25/11-13 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 southern part of the Balder Field, and evaluate the sand-shale distribution and the reservoir quality of the Paleocene sands. Top of the Paleocene reservoir sands was anticipated at 1702 m MSL.
Operations and results
Appraisal well 25/11-13 was spudded with the semi-submersible installation Glomar Biscay II on 10 May 1981 and drilled to TD at 1932 m in the Late Cretaceous Tor Formation. The well was drilled with seawater and bentonite down to 500 m and with seawater/bentonite/lignosulphonate mud from 500 m to TD.
Shows of hydrocarbons were present in three 1-2 m thick Intra-Balder Formation sand beds between 1723 and 1743 m. The main oil-bearing Paleocene reservoir sand (Hermod Formation) was encountered between 1768.8 m to 1816.8 m. It contained oil down to the OWC at 1783 m (1758 m MSL), which is close to the regional Balder Field OWC. The average porosity in the oil zone was 33.5 %. Poorly developed 4 m thick Heimdal Formation sand was penetrated at 1858 m, and then a massive Ty Formation sandstone was penetrated from 1875 m down to the Shetland Group at 1908 m.
No cores were cut and no wire line fluid samples were taken.
The well was permanently abandoned on 29 May 1981 as an oil appraisal.
Testing
No drill stem test was performed.
Interval [m]: 220.00 - 1932.00
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 | 215.0 | 36 | 216.0 | |
| INTERM. | 13 3/8 | 483.0 | 17 1/2 | 500.0 | 1.66 |
| INTERM. | 9 5/8 | 1328.0 | 12 1/4 | 1345.0 | 1.81 |
| OPEN HOLE | 1932.0 | 8 1/2 | 1932.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 230 | 1.06 | 75.0 | waterbased | ||
| 810 | 1.07 | 43.0 | waterbased | ||
| 1360 | 1.18 | 51.0 | waterbased | ||
| 1860 | 1.20 | 53.0 | waterbased |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| IEL BHC AC GR SP | 149 - 1926 |
| DLL MLL GR | 1326 - 1927 |
| DEN NEU GR | 1320 - 1927 |
| DIPLOG | 1325 - 1927 |
| SWC | 1369 - 1910 |
| VELOCITY | 149 - 1927 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 152 | NORDLAND GP |
| 596 | UTSIRA FM |
| 695 | NO FORMAL NAME |
| 735 | HORDALAND GP |
| 735 | SKADE FM |
| 935 | NO FORMAL NAME |
| 978 | SKADE FM |
| 986 | NO FORMAL NAME |
| 1064 | SKADE FM |
| 1095 | NO FORMAL NAME |
| 1202 | SKADE FM |
| 1215 | NO FORMAL NAME |
| 1442 | GRID FM |
| 1452 | NO FORMAL NAME |
| 1678 | ROGALAND GP |
| 1678 | BALDER FM |
| 1728 | INTRA BALDER FM SS |
| 1731 | BALDER FM |
| 1737 | INTRA BALDER FM SS |
| 1741 | BALDER FM |
| 1744 | SELE FM |
| 1769 | HERMOD FM |
| 1817 | SELE FM |
| 1820 | LISTA FM |
| 1858 | HEIMDAL FM |
| 1862 | VÅLE FM |
| 1875 | TY FM |
| 1908 | SHETLAND GP |
| 1908 | EKOFISK FM |
| 1920 | TOR 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_13_Completion_Log | (Format:PDF. Size: 1.172 Mb ) |
| 11_13_Completion_Report | (Format:PDF. Size: 6.825 Mb ) |
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| WDSS_General_Information | (Format:PDF. Size: 0.093 Mb ) |
| WDSS_completion_log | (Format:PDF. Size: 0.160 Mb ) |
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