Generated 10.02.2012
|
|
The NPD's Fact-pages |
|
|
Generated 10.02.2012 |
|
After more than 10 years as a fact provider NPDs FactPages version 1 will be shut down in Dec. 2011.
Start using FactPages version 2 now! See also FactPages version 2 Quick Reference' If you have any questions or comments please send an e-mail to FactWEB@npd.no. |
| NPDID wellbore: | 371 | |
| Well name: | 25/11-11 | |
| Drilling operator name: | Esso Exploration and Production Norway A/S | |
| Geodetic datum: | ED50 | |
| Coordinates: | 59° 11` 47.20`` N | 2° 20` 47.43`` E |
| UTM coordinates: | 6562261.12 N | 462667.99 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 001 | |
| Area: | NORTH SEA | |
| Discovery: | 25/11-1 BALDER | |
| Field: | BALDER | |
| Drill permit: | 278-L | |
| Drilling facility: | GLOMAR BISCAY II | |
| Drilling days: | 29 | |
| Wellbore entry date: | 18.02.1981 | |
| Wellbore completion date: | 18.03.1981 | |
| 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 179 SP: 162 | |
| Kelly bushing elevation (KB) [m]: | 25 | |
| Water depth [m]: | 126 | |
| Total Depth (MD) [m]: | 1960 | |
| Final vertical depth (TVD) [m]: | 1960 | |
| Max inclination [°]: | 4.00 | |
| Bottom hole temperature [°C]: | 55 | |
| Oldest penetrated age: | PALEOCENE | |
| Oldest penetrated formation: | EKOFISK FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 25/11-11 was drilled to appraise the Balder Field on the Utsira High in the North Sea. The objective was to establish the presence of an accumulation of oil sand in the western part of the Balder Field, and evaluate the geologic concept of sand-shale distribution and reservoir quality. The top of the reservoir was anticipated to be at 1708 m MSL.
Operations and results
Appraisal well 25/11-11 was spudded with the semi-submersible installation Glomar Biscay II on 18 February 1981 and drilled to TD at 1960 m in the Danian age chalk of the Ekofisk Formation. The well was drilled with seawater and gel/lignosulphonate.
One main oil sand of Paleocene age (Heimdal Formation) was encountered at 1754 m (1729 m TVD MSL). It was 141.5 m thick and was oil-bearing in the upper 29 m down to an OWC at 1783 m (1758 m TVD MSL). This OWC was in agreement with the general field OWC in the area. Average porosity in the oil sand was 32.6%. Shows of hydrocarbons were also present in a 16 m thick Intra Balder Formation Sandstone with top at 1698 m, and in thin sand stringers within the Sele Formation.
No cores were cut and no wire line fluid samples were taken.
The well was permanently abandoned on 18 March as an oil appraisal.
Testing
No drill stem test was performed.
Interval [m]: 230.00 - 1960.00
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 | 214.0 | 36 | 214.0 | |
| INTERM. | 13 3/8 | 507.8 | 17 1/2 | 523.0 | 1.75 |
| INTERM. | 9 5/8 | 1302.0 | 12 1/4 | 1317.0 | 1.81 |
| OPEN HOLE | 1972.0 | 8 1/2 | 1972.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 310 | 1.06 | 42.0 | waterbased | ||
| 610 | 1.11 | 45.0 | waterbased | ||
| 1080 | 1.08 | 38.0 | waterbased | ||
| 1340 | 1.15 | 46.0 | waterbased |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| IEL BHC AC GR SP | 150 - 1960 |
| DLL MLL GR | 1305 - 1962 |
| DEN NEU GR | 1302 - 1962 |
| DIPLOG | 1302 - 1962 |
| SWC | 1405 - 1942 |
| VELOCITY | 150 - 1961 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 151 | NORDLAND GP |
| 574 | UTSIRA FM |
| 714 | NO FORMAL NAME |
| 758 | HORDALAND GP |
| 758 | SKADE FM |
| 959 | NO FORMAL NAME |
| 1068 | SKADE FM |
| 1085 | NO FORMAL NAME |
| 1218 | GRID FM |
| 1245 | NO FORMAL NAME |
| 1655 | ROGALAND GP |
| 1655 | BALDER FM |
| 1698 | INTRA BALDER FM SS |
| 1714 | SELE FM |
| 1738 | LISTA FM |
| 1754 | HEIMDAL FM |
| 1895 | LISTA FM |
| 1940 | SHETLAND GP |
| 1940 | 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_11_Completion_Log | (Format:PDF. Size: 1.148 Mb ) |
| 11_11_Completion_Report | (Format:PDF. Size: 6.809 Mb ) |
|
You need an ACROBAT reader from ADOBE to display the reports in pdf format. |
| WDSS_General_Information | (Format:PDF. Size: 0.093 Mb ) |
| WDSS_completion_log | (Format:PDF. Size: 0.141 Mb ) |
|
|
You need an ACROBAT reader from ADOBE to display the reports in pdf format. |
