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Generated 10.02.2012 |
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| NPDID wellbore: | 213 | |
| Well name: | 25/11-9 | |
| Drilling operator name: | Esso Exploration and Production Norway A/S | |
| Geodetic datum: | ED50 | |
| Coordinates: | 59° 10` 14.02`` N | 2° 22` 30.84`` E |
| UTM coordinates: | 6559363.15 N | 464281.94 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 001 | |
| Area: | NORTH SEA | |
| Discovery: | 25/11-1 BALDER | |
| Field: | BALDER | |
| Drill permit: | 266-L | |
| Drilling facility: | NORSKALD | |
| Drilling days: | 34 | |
| Wellbore entry date: | 04.11.1980 | |
| Wellbore completion date: | 07.12.1980 | |
| Original wellbore purpose: | APPRAISAL | |
| Wellbore purpose: | APPRAISAL | |
| Wellbore status: | P&A | |
| Wellbore contents: | OIL/GAS | |
| Discovery wellbore: | NO | |
| Formation/age with hydrocarbons 1: | INTRA BALDER FM SS / EOCENE | |
| Formation/age with hydrocarbons 2: | HERMOD FM / PALEOCENE | |
| Seismic location: | 218 SP.227 | |
| Kelly bushing elevation (KB) [m]: | 25 | |
| Water depth [m]: | 126 | |
| Total Depth (MD) [m]: | 1910 | |
| Final vertical depth (TVD) [m]: | 1910 | |
| Max inclination [°]: | ||
| Bottom hole temperature [°C]: | 57 | |
| Oldest penetrated age: | LATE CRETACEOUS | |
| Oldest penetrated formation: | TOR FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 25/11-9 was drilled ca km west-south west of the 25/11-1 Balder discovery well on the Utsira High in the North Sea. The objective was to establish the presence of a thick accumulation of oil sand in the southern part of the Balder Field, and to confirm the reservoir quality of Lobe 8 penetrated in the 25/11-5 well. The top of the reservoir was anticipated to be at 1688 m subsea.
Operations and results
Appraisal well 25/11-9 was spudded with the semi-submersible installation Norskald on 4 November 1980 and drilled to TD at 1910 m in the Late Cretaceous Tor Formation. The well was drilled with Seawater/Gel/Lignosulphonate.
The well penetrated the Utsira Formation and several Skade Formation sands and then penetrated a ca 560 m thick section of shale/mudstone/siltstone belonging to the lower Hordaland Group before top Balder Formation was encountered at 1670 m. Drilling revealed two oil sand zones, one of Eocene age between 1708.5 m and 1742 m (Intra Balder Formation sand), the second of Paleocene age (Hermod Formation) between 1781 m and 1785 m, which is the Balder Field oil-water contact. A few thin sands in the upper Balder Formation from 1671 m to1694 m also appeared to be oil bearing. A second Hermod Formation from 1789 to 1818 m was water wet with some weak shows.
Four conventional cores were attempted in the interval 1718 to 1744 m in the Intra Balder Formation Sandstone, but only 3.5 m from the first and 1.5 m from the last core was retrieved. No wire line fluid samples were taken.
The well was permanently abandoned on 7 December 1980 as an oil appraisal well.
Testing
No drill stem test was performed.
Interval [m]: 220.00 - 1910.00
Core length [m]: 4.50
| Core number | Interval |
|---|---|
| 1 | 1718-1721.5 |
| 2 | NO CORE |
| 3 | NO CORE |
| 4 | 1734-1735 |
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 | 188.0 | 36 | 191.0 | |
| SURF.COND. | 20 | 188.0 | 26 | 191.0 | |
| INTERM. | 13 3/8 | 475.0 | 17 1/2 | 473.0 | |
| INTERM. | 9 5/8 | 1183.0 | 12 1/4 | 1200.0 | |
| LINER | 7 | 1860.0 | 8 1/2 | 1860.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 145 | 1.04 | waterbased | |||
| 300 | 1.05 | waterbased | |||
| 473 | 1.08 | waterbased | |||
| 820 | 1.11 | 46.0 | waterbased | ||
| 1200 | 1.09 | waterbased | |||
| 1693 | 1.11 | 66.0 | waterbased |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| IEL BHC AC SP GR | 150 - 1908 |
| DLL MLL GR | 1192 - 1909 |
| CDL CNL GR | 1185 - 1909 |
| DIPLOG | 1208 - 1909 |
| SWC | 1250 - 1895 |
| SWC | 1718 - 1790 |
| VELOCITY | 150 - 1909 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 151 | NORDLAND GP |
| 620 | UTSIRA FM |
| 745 | NO FORMAL NAME |
| 770 | HORDALAND GP |
| 770 | SKADE FM |
| 935 | NO FORMAL NAME |
| 1000 | SKADE FM |
| 1022 | NO FORMAL NAME |
| 1040 | SKADE FM |
| 1045 | NO FORMAL NAME |
| 1077 | SKADE FM |
| 1112 | NO FORMAL NAME |
| 1670 | ROGALAND GP |
| 1670 | BALDER FM |
| 1713 | INTRA BALDER FM SS |
| 1741 | BALDER FM |
| 1768 | SELE FM |
| 1782 | HERMOD FM |
| 1783 | SELE FM |
| 1789 | HERMOD FM |
| 1818 | SELE FM |
| 1825 | LISTA FM |
| 1855 | HEIMDAL FM |
| 1863 | LISTA FM |
| 1882 | VÅLE FM |
| 1887 | SHETLAND GP |
| 1887 | EKOFISK FM |
| 1902 | TOR 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.
| 25_11_9_Completion_Report | (Format:PDF. Size: 3.814 Mb ) |
| 25_11_9_Completion_log | (Format:PDF. Size: 1.371 Mb ) |
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| WDSS_General_Information | (Format:PDF. Size: 0.116 Mb ) |
| WDSS_completion_log | (Format:PDF. Size: 0.148 Mb ) |
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