Generated 11.02.2012
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Generated 11.02.2012 |
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| NPDID wellbore: | 4716 | |
| Well name: | 25/4-7 | |
| Drilling operator name: | Marathon Petroleum Norge AS | |
| Geodetic datum: | ED50 | |
| Coordinates: | 59° 32` 52.06`` N | 2° 1` 10.91`` E |
| UTM coordinates: | 6601613.95 N | 444575.05 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 203 | |
| Area: | NORTH SEA | |
| Discovery: | 25/4-7 ALVHEIM | |
| Field: | ALVHEIM | |
| Drill permit: | 1053-L | |
| Drilling facility: | DEEPSEA BERGEN | |
| Drilling days: | 27 | |
| Wellbore entry date: | 21.03.2003 | |
| Wellbore completion date: | 17.04.2003 | |
| Original wellbore purpose: | WILDCAT | |
| Wellbore purpose: | WILDCAT | |
| Wellbore status: | P&A | |
| Wellbore contents: | OIL | |
| Discovery wellbore: | YES | |
| Formation/age with hydrocarbons 1: | HEIMDAL FM / PALEOCENE | |
| Seismic location: | line 1026 & trace 4924 NH9601 | |
| Kelly bushing elevation (KB) [m]: | 23 | |
| Water depth [m]: | 119 | |
| Total Depth (MD) [m]: | 2286 | |
| Final vertical depth (TVD) [m]: | 2286 | |
| Max inclination [°]: | 2.60 | |
| Bottom hole temperature [°C]: | 73 | |
| Oldest penetrated age: | PALEOCENE | |
| Oldest penetrated formation: | HEIMDAL FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
The Kneler well 25/4-7 was designed as an exploratory test of an irregular 4-way closure midway between the Kameleon structure (discovered by well 24/6-2 in 1998), and the Gekko structure (discovered by well 25/4-3 in 1974), which found a thin hydrocarbon column. The primary reservoir target was the Paleocene Heimdal formation. Well 25/4-7 was designed to provide local structural control to reduce uncertainty in field size and also provide stratigraphic control, particularly the position and character of a shale horizon at the base of the Upper Heimdal reservoir.
Operations and results
Exploration well 25/4-7 was spudded with the semi-submersible installation Deepsea Bergen on 21 March 2003 and drilled to TD at 2286 m in the Paleocene Heimdal Formation. The well was drilled without significant problems. A number of attempts to get wire line tools to TD failed due to hole obstructions. Hole opening of the 12 1/4" section to 8 1/2" was performed in several steps. Between hole opening operations logging was attempted with variable success. Logs were finally acquired down to 2242 m. The well was drilled with seawater down to 1317 m and with Carbosea oil based mud from 1317 m to TD.
The Heimdal Formation was encountered at 2084.5 m and from logs, MDT sampling, and shows on cores and cuttings it was oil bearing down to the OWC at 2132.5 m. The Heimdal Formation at this location consists of an upper, heterolithic
dominated sequence down to 2105.5 m and more massive sandstone below that depth.
A total of 53 m of core (97.7 % recovery) was cut in two cores in the interval from 2104 m to 2157 m in the Heimdal formation. MDT fluid samples were taken at 2086.4 m (oil), 2110.0 m (oil), and at 2144.7 m (water).
The well was suspended as an oil discovery on 17 April 2003
Testing
No drill stem test was performed.
Interval [m]: 1320.00 - 2286.00
Core length [m]: 51.97
| Core number | Interval |
|---|---|
| 1 | 2104-2129.77 |
| 2 | 2130-2156.2 |
No scanned core photos available
No palynological slides in this wellbore.
| Test type: | Bottle test number: | Bottle interval [m]: | Fluid type: | Test date and time: |
|---|---|---|---|---|
| MDT | 2110.000 - 0.000 | OIL | 2003.04.14 00:04 |
| Type | Casing diam. [inch] | Depth below KB [m] | Hole diam. [inch] | Hole depth below KB [m] | Lot mud eqv. [g/cm3] |
|---|---|---|---|---|---|
| CONDUCTOR | 30 | 202.0 | 36 | 204.0 | |
| SURF.COND. | 13 3/8 | 1308.0 | 17 1/2 | 1317.0 | 1.50 |
| OPEN HOLE | 2286.0 | 8 1/2 | 2286.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 1200 | 1.01 | 16.0 | SEAWATER | ||
| 1317 | 1.20 | 25.0 | SPUD MUD | ||
| 1334 | 1.20 | 18.0 | OIL (REGULAR) | ||
| 1980 | 1.33 | 22.0 | OIL (REGULAR) | ||
| 2212 | 1.25 | 18.0 | OIL (REGULAR) | ||
| 2286 | 1.25 | 19.0 | OIL (REGULAR) |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| PEX DSI AIT | 1306 - 1373 |
| PEX DSI AIT | 202 - 2025 |
| PEX DSI AIT | 1970 - 2235 |
| MDT GR | 2085 - 2157 |
| VSI GR | 750 - 2191 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 142 | NORDLAND GP |
| 368 | UTSIRA FM |
| 727 | HORDALAND GP |
| 1216 | GRID FM |
| 1320 | HORDALAND GP |
| 1895 | ROGALAND GP |
| 1895 | BALDER FM |
| 2005 | SELE FM |
| 2039 | LISTA FM |
| 2085 | HEIMDAL FM |
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Composite log (Format:PDF. Size: 0.200 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.
