Generated 11.02.2012
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Generated 11.02.2012 |
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| NPDID wellbore: | 3755 | |
| Well name: | 25/11-23 | |
| Drilling operator name: | Esso Exploration and Production Norway A/S | |
| Geodetic datum: | ED50 | |
| Coordinates: | 59° 14` 07.23`` N | 2° 21` 04.64`` E |
| UTM coordinates: | 6566589.88 N | 462983.22 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 001 | |
| Area: | NORTH SEA | |
| Discovery: | 25/11-1 BALDER | |
| Field: | BALDER | |
| Drill permit: | 951-L | |
| Drilling facility: | MÆRSK JUTLANDER | |
| Drilling days: | 16 | |
| Wellbore entry date: | 13.05.1999 | |
| Wellbore completion date: | 28.05.1999 | |
| 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 | |
| Seismic location: | ||
| Kelly bushing elevation (KB) [m]: | 23 | |
| Water depth [m]: | 127 | |
| Total Depth (MD) [m]: | 2014 | |
| Final vertical depth (TVD) [m]: | 2014 | |
| Max inclination [°]: | 2.11 | |
| Bottom hole temperature [°C]: | ||
| Oldest penetrated age: | EARLY JURASSIC | |
| Oldest penetrated formation: | STATFJORD FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 25/11-23 was designed to appraise oil and gas in Eocene and Paleocene sands north of the Balder field. The well would also serve as a pilot hole for the production well if economic volumes of hydrocarbon were discovered. Additional objectives were to provide velocity control point for North Balder depth conversion and to provide a reservoir sand control point for seismic attribute calibration.
Operations and results
Appraisal well 25/11-23 was spudded with the semi-submersible installation "Mærsk Jutlander" on 13 May 1999 and drilled to 2014 m in claystones and sandstones of Early Jurassic age. The well was drilled with sea water and bentonite pills down to 970 m and with oil based mud (Enviromud) from 970 m to TD. Oil was encountered in Eocene Intra Balder Formation sandstones. Two cores were cut in the interval 1710 m to 1765.5 m in Early Eocene Balder Formation. MDT fluid samples were taken at 1755 m in the oil zone.
The well confirmed oil in intra Balder sandstones and was plugged and abandoned as an oil appraisal well on 28 May 1999.
Testing
No drill stem test was performed
Interval [m]: 980.00 - 2010.00
Core length [m]: 55.50
| Core number | Interval |
|---|---|
| 1 | 1710.00-1747.00 |
| 2 | 1747.00-1765.50 |
 1710-1715m |
 1715-1720m |
 1720-1725m |
 1725-1730m |
 1730-1735m |
 1735-1740m |
 1740-1745m |
 1745-1747m |
 1747-1752m |
 1752-1757m |
 1757-1762m |
 1762-1766m |
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 | 211.0 | |
| INTERM. | 9 5/8 | 951.0 | 12 1/4 | 951.0 | |
| OPEN HOLE | 2014.0 | 8 1/2 | 2014.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 420 | 1.04 | SPUD MUD | |||
| 850 | 1.32 | 29.0 | OIL (ENVIRON) | ||
| 970 | 1.04 | 1.0 | SEAWATER | ||
| 970 | 1.13 | 1.0 | SPUD MUD | ||
| 1151 | 1.32 | 20.0 | OIL (ENVIRON) | ||
| 1606 | 1.32 | 30.0 | OIL (ENVIRON) | ||
| 1735 | 1.32 | 25.0 | OIL (ENVIRON) | ||
| 1769 | 1.34 | 23.0 | OIL (ENVIRON) | ||
| 2014 | 1.32 | 25.0 | OIL (ENVIRON) |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| MWD - DIR EWR-4 DGR | 150 - 2015 |
| AITH IPLT DSI | 930 - 2017 |
| MDT GR | 1696 - 2017 |
| VSP | 538 - 2017 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 150 | NORDLAND GP |
| 538 | UTSIRA FM |
| 650 | NO FORMAL NAME |
| 730 | HORDALAND GP |
| 730 | SKADE FM |
| 984 | NO FORMAL NAME |
| 1172 | SKADE FM |
| 1258 | NO FORMAL NAME |
| 1699 | ROGALAND GP |
| 1699 | BALDER FM |
| 1752 | INTRA BALDER FM SS |
| 1764 | BALDER FM |
| 1782 | SELE FM |
| 1796 | HERMOD FM |
| 1804 | SELE FM |
| 1808 | HERMOD FM |
| 1864 | SELE FM |
| 1866 | LISTA FM |
| 1899 | HEIMDAL FM |
| 1909 | LISTA FM |
| 1945 | HEIMDAL FM |
| 1971 | SHETLAND GP |
| 1971 | EKOFISK FM |
| 1975 | NO GROUP DEFINED |
| 1975 | STATFJORD FM |
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Composite log (Format:PDF. Size: 0.363 Mb) |
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No geochemical data presently available. Regional geochemical studies which include data from this well may however be filed on a different well.
No documents presently available.
