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Generated 10.02.2012 |
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| NPDID wellbore: | 370 | |
| Well name: | 25/11-10 | |
| Drilling operator name: | Esso Exploration and Production Norway A/S | |
| Geodetic datum: | ED50 | |
| Coordinates: | 59° 10` 09.23`` N | 2° 20` 58.00`` E |
| UTM coordinates: | 6559229.08 N | 462806.17 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 001 | |
| Area: | NORTH SEA | |
| Discovery: | 25/11-1 BALDER | |
| Field: | BALDER | |
| Drill permit: | 274-L | |
| Drilling facility: | GLOMAR BISCAY II | |
| Drilling days: | 29 | |
| Wellbore entry date: | 20.01.1981 | |
| Wellbore completion date: | 17.02.1981 | |
| Original wellbore purpose: | APPRAISAL | |
| Wellbore purpose: | APPRAISAL | |
| Wellbore status: | P&A | |
| Wellbore contents: | SHOWS | |
| Discovery wellbore: | NO | |
| Seismic location: | BALMG 220 SP: 168. | |
| Kelly bushing elevation (KB) [m]: | 25 | |
| Water depth [m]: | 124 | |
| Total Depth (MD) [m]: | 1988 | |
| Final vertical depth (TVD) [m]: | 1988 | |
| Max inclination [°]: | ||
| 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 25/11-10 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 geologic concept of sand-shale distribution and the reservoir quality of the Paleocene sands.
Operations and results
Appraisal well 25/11-10 was spudded with the semi-submersible installation Glomar Biscay II on 20 January 1981 on and drilled to TD at 1988 m (1985 m logger's depth) in the Danian age chalk of the Ekofisk Formation. The well was drilled with seawater/gel/Lignosulphonate mud.
The Paleocene Heimdal Formation reservoir sands anticipated to be present in this well were found at 1786 m, significantly deeper than prognosed and below the field oil-water contact. Gross thickness of the sands was 128.2 m with an average porosity of 31.4%. They were water wet. The sands were found similar to those found in 25/11-7 to the north. Only thin stringers (2.5 m totally) with shows between 1757 m and 1785 m were found in the Sele and Lista formations.
No cores were cut and no wire line fluid samples were taken.
The well was permanently abandoned on 17 February 1981 as a dry well with shows.
Testing
No drill stem test was performed.
Interval [m]: 220.00 - 1980.00
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 | 211.0 | 36 | 212.0 | |
| INTERM. | 13 3/8 | 470.0 | 17 1/2 | 485.0 | 1.63 |
| INTERM. | 9 5/8 | 1210.0 | 12 1/4 | 1225.0 | 1.77 |
| OPEN HOLE | 1988.0 | 8 1/2 | 1988.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 310 | 1.06 | 29.0 | waterbased | ||
| 640 | 1.09 | 33.0 | waterbased | ||
| 1210 | 1.15 | 44.0 | waterbased | ||
| 1400 | 1.16 | 47.0 | waterbased | ||
| 1870 | 1.19 | 52.0 | waterbased |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| VELOCITY LOG | 139 - 1975 |
| IEL BHC AC GR SP | 139 - 1983 |
| DEN NEU GR | 1210 - 1984 |
| DIPLOG | 1215 - 1985 |
| SWC | 1298 - 1970 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 149 | NORDLAND GP |
| 601 | UTSIRA FM |
| 754 | NO FORMAL NAME |
| 778 | HORDALAND GP |
| 778 | SKADE FM |
| 1004 | NO FORMAL NAME |
| 1025 | SKADE FM |
| 1062 | NO FORMAL NAME |
| 1159 | SKADE FM |
| 1223 | NO FORMAL NAME |
| 1260 | SKADE FM |
| 1270 | NO FORMAL NAME |
| 1682 | ROGALAND GP |
| 1682 | BALDER FM |
| 1725 | SELE FM |
| 1743 | LISTA FM |
| 1786 | HEIMDAL FM |
| 1930 | LISTA FM |
| 1943 | HEIMDAL FM |
| 1958 | VÅLE FM |
| 1968 | SHETLAND GP |
| 1968 | 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_10_Completion_Log | (Format:PDF. Size: 1.261 Mb ) |
| 11_10_Completion_Report | (Format:PDF. Size: 8.817 Mb ) |
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| WDSS_General_Information | (Format:PDF. Size: 0.090 Mb ) |
| WDSS_completion_log | (Format:PDF. Size: 0.147 Mb ) |
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You need an ACROBAT reader from ADOBE to display the reports in pdf format. |
