Generated 12.03.2010
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The NPD's Fact-pages |
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Generated 12.03.2010 |
| NPDID wellbore: | 172 | |
| Well name: | 2/4-2 | |
| Drilling operator name: | Phillips Petroleum Company Norway | |
| Geodetic datum: | ED50 | |
| Coordinates: | 56° 32` 08.65`` N | 3° 11` 54.57`` E |
| UTM coordinates: | 6265865.23 N | 512208.29 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 018 | |
| Area: | NORTH SEA | |
| Discovery: | 2/4-2 EKOFISK | |
| Field: | EKOFISK | |
| Drill permit: | 34-L | |
| Drilling facility: | OCEAN VIKING | |
| Drilling days: | 98 | |
| Wellbore entry date: | 18.09.1969 | |
| Wellbore completion date: | 24.12.1969 | |
| Original wellbore purpose: | WILDCAT | |
| Wellbore purpose: | WILDCAT | |
| Wellbore status: | P&A | |
| Wellbore contents: | OIL/GAS | |
| Discovery wellbore: | YES | |
| Formation/age with hydrocarbons 1: | TOR FM / LATE CRETACEOUS | |
| Formation/age with hydrocarbons 2: | EKOFISK FM / PALEOCENE | |
| Seismic location: | LINE PG-0312 SP: 698. | |
| Kelly bushing elevation (KB) [m]: | 27 | |
| Water depth [m]: | 70 | |
| Total Depth (MD) [m]: | 3305 | |
| Final vertical depth (TVD) [m]: | ||
| Max inclination [°]: | 6.75 | |
| Bottom hole temperature [°C]: | 133 | |
| Oldest penetrated age: | LATE CRETACEOUS | |
| Oldest penetrated formation: | TOR FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Wildcat well 2/4-2 (originally termed 2/4-1AX by the License) was drilled by Phillips as a replacement for well 2/4-1, which was junked at 1662 m in Miocene sediments due to an oil kick and severe circulation problems. The objective was to test the hydrocarbon potential of the Tertiary and top Cretaceous.
Operations and results
Wildcat well 2/4-2 was spudded with the semi-submersible installation Ocean Viking on 18 September 1969 and drilled to TD at 3305 m in the Late Cretaceous Tor Formation. No significant problems occurred in the operations. The well was drilled with seawater and hi-vis pills down to 619 m, and with lignosulphonate mud from 619 m to TD.
The well discovered oil in Danian and Late Cretaceous chalk (Ekofisk and Tor Formations). The oil was found in two reservoirs separated by a hard, grey and tight lime mudstone in the base of the Ekofisk Formation. The upper, Ekofisk Formation reservoir was encountered at 3033 m and continued down to the tight lime mudstone at 3183 m. The lower, Tor Formation reservoir extended from 3203 m to 3257 m. Comparison between DST oil from the Ekofisk Formation in well 2/4-2 and the Miocene "kick-oil" encountered in well 2/4-1 showed that the 2/4-1 Miocene oil is a heavier oil with a higher asphaltene content and lower paraffin content than the 2/4-2 oil.
Eight conventional cores were cut with a total of 48.5 m recovered. Core 1 was cut in Early Miocene from 1664 to 1679.4 m, while cores 2 - 8 were cut in the Ekofisk and Tor Formations in the interval 3051 m to 3280 m. No wire line fluid samples were taken
The well was suspended on 24 December 1969 as the Ekofisk Discovery well, the first economic petroleum discovery on the Norwegian Continental Shelf.
Testing
One successful drill stem tests (DST 4) was conducted in open hole in the interval 3159 to 3195.5 m at the base of the Ekofisk Formation. It flowed 5.9 MMCFD (167069 Sm3) gas and 1071 BPD (170 Sm3) oil on a 34/64" choke. The GOR was reported as 5500 cu.ft./STB (980 Sm3/Sm3). The oil had an API gravity of 37.2 deg. The reservoir temperature was reported to be 265 deg F (129.4 deg C).
Interval [m]: 838.20 - 3304.03
Core length [m]: 32.31
| Core number | Interval |
|---|---|
| 1 | NO CORE |
| 2 | 10010-10017' |
| 3 | 10496-10510' |
| 4 | 10515-10528' |
| 5 | 10565-10573' |
| 6 | 10605-10621.5' |
| 7 | 10653-10657' |
| 8 | 10713-10755' |
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 | 132.0 | 36 | 133.0 | |
| SURF.COND. | 20 | 581.0 | 26 | 581.0 | |
| INTERM. | 13 3/8 | 1607.0 | 17 1/2 | 1607.0 | |
| INTERM. | 9 5/8 | 2366.0 | 12 1/4 | 2366.0 | |
| LINER | 7 | 3159.0 | 8 1/2 | 3159.0 | |
| LINER | 5 | 3305.0 | 6 | 3305.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 619 | 1.15 | 85.0 | spud-mud | ||
| 655 | 1.55 | 45.0 | spud-mud | ||
| 1150 | 1.64 | 50.0 | spud-mud | ||
| 1616 | 1.67 | 50.0 | water-based | ||
| 2377 | 1.71 | 50.0 | water-based | ||
| 3039 | 1.61 | 45.0 | water-based | ||
| 3265 | 1.66 | 45.0 | water-based | ||
| 3305 | 1.67 | 47.0 | water-based |
| Test no. | Test interval [m] | Choke size [mm] | Final shut in pressure [MPa] | Final flow pressure [MPa] | Bottom hole pressure [MPa] | Downhole temperature [°C] |
|---|---|---|---|---|---|---|
| 1.0 | 3160 - 3196 | 25.4 | 0 | |||
| 2.0 | 3160 - 3196 | 0 | ||||
| 3.0 | 3160 - 3196 | 0 | ||||
| 4.0 | 3148 - 3160 | 25.4 | 0 |
| Test no. | Oil [Sm3/day] | Gas [Sm3/day] | Oil grav. [g/cm3] | Gas grav. rel.air | GOR [m3/m3] |
|---|---|---|---|---|---|
| 1.0 | 1089 | 0 | 0 | ||
| 2.0 | 0 | 0 | 0 | ||
| 3.0 | 0 | 0 | 0 | ||
| 4.0 | 170 | 167067 | .839 | 0 |
| Log type | Intervals logged [m] |
|---|---|
| IEL | 580 - 3305 |
| AC GR CAL | 580 - 3302 |
| NEU POR | 2865 - 3304 |
| MLL | 2865 - 3304 |
| LL | 2865 - 3304 |
| FDC | 2865 - 3304 |
| DIP | 2365 - 3155 |
| TEMP | 40 - 3305 |
| CBL | 2295 - 3154 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 98 | NORDLAND GP |
| 1682 | HORDALAND GP |
| 2904 | ROGALAND GP |
| 2904 | BALDER FM |
| 2911 | SELE FM |
| 2970 | LISTA FM |
| 3017 | VÅLE FM |
| 3050 | SHETLAND GP |
| 3050 | EKOFISK FM |
| 3203 | TOR FM |
No composite log presently available.
| File 1 | (Format:PDF. Size: 0.330 Mb ) |
| File 2 | (Format:PDF. Size: 1.254 Mb ) |
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| 2_4_2_Completion_Report_and_Completion_log_2 | (Format:PDF. Size: 10.782 Mb ) |
| 2_4_2_Well_Recompletion_Report | (Format:PDF. Size: 3.352 Mb ) |
| 4_2_Additional_Core_Description_Sheets | (Format:PDF. Size: 10.820 Mb ) |
| 4_2_Completion_report | (Format:PDF. Size: 5.876 Mb ) |
| 4_2_Drilling_Fluid_Summary | (Format:PDF. Size: 3.215 Mb ) |
| 4_2_Drilling_Mud_Reports | (Format:PDF. Size: 0.170 Mb ) |
| 4_2_Individual_Well_Completion_Report | (Format:PDF. Size: 42.420 Mb ) |
| 4_2_Individual_well_Record | (Format:PDF. Size: 30.195 Mb ) |
| 4_2_Lithological_and_Sedimentological_Eval | (Format:PDF. Size: 2.487 Mb ) |
| 4_2_Petrography_of_Selected_Samples | (Format:PDF. Size: 25.117 Mb ) |
| 4_2_Quantitative_Log_Analysis_1 | (Format:PDF. Size: 8.607 Mb ) |
| 4_2_Quantitative_Log_Analysis_2 | (Format:PDF. Size: 5.032 Mb ) |
| 4_2_The_Micropalaeontology_and_Stratigraphy | (Format:PDF. Size: 4.153 Mb ) |
| 4_2_Well_Log_Study | (Format:PDF. Size: 7.105 Mb ) |
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| WDSS_General_Information | (Format:PDF. Size: 0.187 Mb ) |
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| NPD_Paper_No.25_Lithology__Well_2_4_2 | (Format:PDF. Size: 18.183 Mb ) |
| NPD_Paper_No.25_Lithologic_Correlation_chart__Well_2_4_2 | (Format:PDF. Size: 1.908 Mb ) |
| NPD_Paper_No.25_Paleocene_Maastrichtian_Correlation_chart_Well_2_4_2 | (Format:PDF. Size: 1.153 Mb ) |
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