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Generated 11.02.2012 |
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| NPDID wellbore: | 1308 | |
| Well name: | 2/5-8 | |
| Drilling operator name: | Amoco Norway Oil Company | |
| Geodetic datum: | ED50 | |
| Coordinates: | 56° 35` 15.77`` N | 3° 26` 22.51`` E |
| UTM coordinates: | 6271719.80 N | 526999.75 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 006 | |
| Area: | NORTH SEA | |
| Discovery: | 2/5-3 SØRØST TOR | |
| Field: | NOT YET DEVELOPED | |
| Drill permit: | 585-L | |
| Drilling facility: | DYVI STENA | |
| Drilling days: | 49 | |
| Wellbore entry date: | 18.09.1988 | |
| Wellbore completion date: | 05.11.1988 | |
| Original wellbore purpose: | APPRAISAL | |
| Wellbore purpose: | APPRAISAL | |
| Wellbore status: | P&A | |
| Wellbore contents: | OIL SHOWS | |
| Discovery wellbore: | NO | |
| Seismic location: | ANO 79 - 56 SP 133 | |
| Kelly bushing elevation (KB) [m]: | 25 | |
| Water depth [m]: | 67 | |
| Total Depth (MD) [m]: | 3367 | |
| Final vertical depth (TVD) [m]: | 3364 | |
| Max inclination [°]: | 4.30 | |
| Bottom hole temperature [°C]: | 132 | |
| Oldest penetrated age: | LATE CRETACEOUS | |
| Oldest penetrated formation: | HOD FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 2/5-8 is located on the South East Tor Field in block 2/5 in the Central Trough in the North Sea. The overall outline of the field had previously been defined by the wells 2/5-3 and 2/5-5. The purpose of the well was to test the distribution of high-porosity, re-deposited chalk and productive zones west of the major NS trending crestal fault in the field. It was also planned to test the productivity of the chalk in both the Ekofisk and the Tor Formations on the flanks, confirm reserve calculations for the structure and get good oriented core coverage in both formations.
Operations and results
Appraisal well 2/5-8 was spudded with the semi-submersible installation Dyvi Stena on 18 September 1988 and drilled to TD at 3367 m in the Late Cretaceous Hod Formation. Drilling proceeded without significant problems. The well was drilled with seawater and pre-hydrated gel sweeps down to 370 m and with water based gypsum/polymer non-dispersed mud from 370 m to TD.
Top Ekofisk came in at 3107 m and top Tor Formation at 3204 m. Two cores were cut in the interval 3115 - 3142.5 m in the Ekofisk Formation and another three cores in the interval 3207 - 3291 m in the Tor Formation. The chalk was of a relatively poor reservoir quality both in the Ekofisk and Tor Formation, and oil staining were only found along fracture planes in cores from the Tor Formation. The logs confirmed the negative result from the cores.
No fluid samples were taken in the well.
The well was permanently abandoned on 5 November 1988 as a dry well with shows.
Testing
No drill stem test was performed.
Interval [m]: 390.00 - 3365.00
Core length [m]: 112.15
| Core number | Interval |
|---|---|
| 1 | 3115-3130 |
| 2 | 3130-3142 |
| 3 | 3207-3234.9 |
| 4 | 3235-3263 |
| 5 | 3262-3291.25 |
 3115-3120m |
 3120-3125m |
 3125-3130m |
 3130-3135m |
 3135-3140m |
 3140-3142m |
 3207-3212m |
 3212-3217m |
 3217-3222m |
 3222-3227m |
 3227-3232m |
 3232-3234m |
 3235-3240m |
 3240-3245m |
 3245-3249m |
 3249-3254m |
 3254-3259m |
 3259-3263m |
 3263-3268m |
 3268-3273m |
 3273-3278m |
 3278-3283m |
 3283-3288m |
 3288-3291m |
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 | 139.0 | 36 | 166.0 | |
| SURF.COND. | 20 | 359.0 | 26 | 373.0 | 1.50 |
| SURF.COND. | 20 | 360.0 | 26 | 373.0 | 1.50 |
| INTERM. | 13 3/8 | 1582.0 | 17 1/2 | 1598.0 | 1.93 |
| INTERM. | 9 5/8 | 3006.0 | 12 1/4 | 3017.0 | 1.92 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 146 | 1.06 | 12.0 | WATER BASED | ||
| 370 | 1.03 | 12.0 | WATER BASED | ||
| 987 | 1.25 | 17.0 | WATER BASED | ||
| 1595 | 1.43 | 29.0 | WATER BASED | ||
| 1860 | 1.62 | 20.0 | WATER BASED | ||
| 2145 | 1.62 | 21.0 | WATER BASED | ||
| 2300 | 1.62 | 21.0 | WATER BASED | ||
| 2728 | 1.62 | 21.0 | WATER BASED | ||
| 3017 | 1.63 | 20.0 | WATER BASED | ||
| 3124 | 1.62 | 23.0 | WATER BASED | ||
| 3253 | 1.62 | 32.0 | WATER BASED | ||
| 3356 | 1.62 | 32.0 | WATER BASED | ||
| 3367 | WATER BASED |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| MWD - GR RES DIR | 146 - 3199 |
| DIL BHC GR CAL | 1578 - 3013 |
| DIL SFL BHC GR | 3004 - 3366 |
| LDT CNL GR | 3004 - 3368 |
| DLL MAFL GR | 3004 - 3368 |
| FMS GR | 3003 - 3368 |
| RFT GR | 3111 - 3290 |
| VELOCITY | 1660 - 3365 |
| CST GR | 3010 - 3360 |
| CBL VDL GR CCL | 1100 - 2983 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 92 | NORDLAND GP |
| 1898 | HORDALAND GP |
| 2953 | ROGALAND GP |
| 2953 | BALDER FM |
| 2973 | SELE FM |
| 3042 | LISTA FM |
| 3090 | MAUREEN FM |
| 3107 | SHETLAND GP |
| 3107 | EKOFISK FM |
| 3204 | TOR FM |
| 3323 | HOD 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.
| WDSS_General_Information | (Format:PDF. Size: 0.291 Mb ) |
| WDSS_completion_log | (Format:PDF. Size: 0.213 Mb ) |
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