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Generated 08.02.2012 |
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| NPDID wellbore: | 6082 | |
| Well name: | 25/8-16 | |
| Drilling operator name: | ExxonMobil Exploration & Production Norway AS | |
| Geodetic datum: | ED50 | |
| Coordinates: | 59° 24` 56.25`` N | 2° 29` 02.34`` E |
| UTM coordinates: | 6586599.87 N | 470710.44 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 027-D | |
| Area: | NORTH SEA | |
| Discovery: | 25/8-16 S | |
| Field: | NOT YET DEVELOPED | |
| Drill permit: | 1237-L | |
| Drilling facility: | BREDFORD DOLPHIN | |
| Drilling days: | 34 | |
| Wellbore entry date: | 10.04.2009 | |
| Wellbore completion date: | 13.05.2009 | |
| 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: | ES9403,inline 1433 & xline2484 | |
| Kelly bushing elevation (KB) [m]: | 25 | |
| Water depth [m]: | 126 | |
| Total Depth (MD) [m]: | 2550 | |
| Final vertical depth (TVD) [m]: | 2132 | |
| Max inclination [°]: | 61.50 | |
| Bottom hole temperature [°C]: | 84 | |
| 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 25/8-16 S is located on the Utsira High in the southern part of the Viking Graben in the North Sea. It was drilled to test the hydrocarbon and reservoir potential in two prospects. The man target was the Eitri prospect in the paleocene Ty Formation, and the second target was the Phi prospect in the Statfjord Formation. Depending on findings in the Ty and Statfjord reservoir sections, it was an option to drill one or two sidetracks. For dry hole cases in Ty and Statfjord reservoir sections, no sidetracks should be drilled.
Operations and results
Wildcat well 25/8-16 S was spudded with the semi-submersible installation Bredford Dolphin on 10 April 2009 and drilled to TD at 2550 m (2132 m TVD) in the Early Jurassic Statfjord Formation . The well was drilled vertical down to 1100 m, and then deviated towards the south. The well was drilled with Seawater/spud mud down to 1935 m and with XP-07 oil based mud from 1035 m to TD.
A 3 m thick oil column was discovered in the Heimdal Formation, in the 12 1/4" section. The oil - water contact was not found. The Heimdal Formation was not one of the targets for the well, and was not prognosed as it was believed to pinch out down flanks of the well. No signs of hydrocarbons were found in the main target Ty Formation, or in the secondary target of Statfjord Formation. No oil shows above the oil based mud were recorded in the well.
No cores were cut in the well. MDT fluid samples were taken with dual packer through perforation in casing at 2232.65 m (1972.65 m TVD) in the Heimdal Formation. When the MDT run was performed, the Heimdal Formation had been behind casing for 8 days, and there had been no circulation for about 100 hours. After 48 hours and pumping of 1769 litres the measured temperature was 79.5 deg C. This temperature is regarded as highly representative for the formation. The samples consisted of oil with a GOR ranging from 136.3 to 149.6 Sm3/Sm3.
Based on the findings in 25/8-16 S, it was decided to drill a side track (25/8-16A) to appraise the discovery made in the Heimdal Formation.
The well bore was permanently abandoned on 13 May 2009 as an oil discovery.
Testing
No drill stem test was performed.
Interval [m]: 1040.00 - 2550.00
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 | 216.0 | 36 | 216.0 | |
| SURF.COND. | 13 3/8 | 1030.0 | 17 1/2 | 1039.0 | 1.82 |
| INTERM. | 9 5/8 | 2353.0 | 12 1/4 | 2370.0 | 1.57 |
| OPEN HOLE | 2550.0 | 8 1/2 | 2550.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 179 | 1.06 | Spud Mud | |||
| 958 | 1.06 | Spud Mud | |||
| 1021 | 1.47 | 21.0 | XP-07 | ||
| 1035 | 1.25 | 18.0 | Spud Mud | ||
| 1159 | 1.50 | 21.0 | XP-07 | ||
| 2346 | 1.50 | 21.0 | XP-07 | ||
| 2370 | 1.50 | 20.0 | XP-07 | ||
| 2550 | 1.39 | 20.0 | XP-07 |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| MWD LWD - DIR | 151 - 220 |
| MWD LWD - DIR DGR EWR PWD | 220 - 1036 |
| MWD LWD - DIR DGR PWD | 220 - 1036 |
| MWD LWD - DIR DGR EWR PWD | 1036 - 2550 |
| IBC CBL GR CCL | 1900 - 2290 |
| GR CCL PERF | 2232 - 2232 |
| MDT DP | 2232 - 2232 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 151 | NORDLAND GP |
| 519 | UTSIRA FM |
| 1005 | HORDALAND GP |
| 1156 | SKADE FM |
| 1224 | GRID FM |
| 1973 | ROGALAND GP |
| 1973 | BALDER FM |
| 2059 | SELE FM |
| 2146 | LISTA FM |
| 2200 | HEIMDAL FM |
| 2359 | TY FM |
| 2395 | SHETLAND GP |
| 2395 | EKOFISK FM |
| 2400 | DUNLIN GP |
| 2400 | AMUNDSEN FM |
| 2495 | NO GROUP DEFINED |
| 2495 | STATFJORD 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.
No documents presently available.
