Generated 10.02.2012
|
|
The NPD's Fact-pages |
|
|
Generated 10.02.2012 |
|
After more than 10 years as a fact provider NPDs FactPages version 1 will be shut down in Dec. 2011.
Start using FactPages version 2 now! See also FactPages version 2 Quick Reference' If you have any questions or comments please send an e-mail to FactWEB@npd.no. |
| NPDID wellbore: | 368 | |
| Well name: | 25/11-7 | |
| Drilling operator name: | Esso Exploration and Production Norway A/S | |
| Geodetic datum: | ED50 | |
| Coordinates: | 59° 10` 33.07`` N | 2° 21` 47.23`` E |
| UTM coordinates: | 6559958.95 N | 463595.03 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 001 | |
| Area: | NORTH SEA | |
| Discovery: | 25/11-1 BALDER | |
| Field: | BALDER | |
| Drill permit: | 204-L | |
| Drilling facility: | NORSKALD | |
| Drilling days: | 25 | |
| Wellbore entry date: | 03.10.1978 | |
| Wellbore completion date: | 27.10.1978 | |
| Original wellbore purpose: | APPRAISAL | |
| Wellbore purpose: | APPRAISAL | |
| Wellbore status: | P&A | |
| Wellbore contents: | OIL | |
| Discovery wellbore: | NO | |
| Formation/age with hydrocarbons 1: | INTRA BALDER FM SS / EOCENE | |
| Formation/age with hydrocarbons 2: | HEIMDAL FM / PALEOCENE | |
| Seismic location: | ||
| Kelly bushing elevation (KB) [m]: | 25 | |
| Water depth [m]: | 124 | |
| Total Depth (MD) [m]: | 1944 | |
| Final vertical depth (TVD) [m]: | ||
| Max inclination [°]: | 1.00 | |
| Bottom hole temperature [°C]: | ||
| 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 25/11-7 was drilled ca 3 km west-south west of the 25/11-1 Balder discovery well on the Utsira High in the North Sea. The primary objective was to delineate topographic mounds developed in the Paleocene sands of the Balder Field. The primary targets were the Zone II sand (E-70 sand) which was found oil-bearing in the 25/11-5 and the Zone I-B sands which were found oil-bearing in the 25/11-6.
Operations and results
Appraisal well 25/11-7 was spudded with the semi-submersible installation Norskald on 3 October 1978 and drilled to TD at 1944 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 600 m thick section of shales belonging to the lower Hordaland Group before top Balder Formation was encountered at 1697 m. The Balder Formation contained some shaley sands with poor to no oil shows. The massive I-B sand at 1750.3 m (Heimdal Formation) was the only significant oil sand in the well. The well proved 36 m of net oil sand with a clear oil-water contact at 1786.5 m (1761.5 m MSL), in reasonable agreement with the Balder Field contact at 1760 m MSL established in 25/11-6. The Zone II (E-70) sand was absent, or possibly an unrecognizable part of the I-B Sand.
A total of 20.35 m core was recovered in four cores from the interval 1748.6 to 1772.3 m in the Lista and Heimdal Formations. No wire line fluid samples were taken.
The well was permanently abandoned on 27 October 1978 as an oil appraisal well.
Testing
No drill stem test was performed.
Interval [m]: 200.00 - 1945.30
Core length [m]: 20.25
| Core number | Interval |
|---|---|
| 1 | 1748.6-1751 |
| 2 | 1751-1753 |
| 3 | 1753-1762.4 |
| 4 | 1762.4-1772.3 |
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 | 186.0 | 36 | 186.0 | |
| INTERM. | 13 3/8 | 396.0 | 17 1/2 | 412.0 | |
| INTERM. | 9 5/8 | 1308.0 | 12 1/4 | 1325.0 | |
| OPEN HOLE | 1944.0 | 8 1/2 | 1944.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 186 | waterbased | ||||
| 694 | 1.08 | waterbased | |||
| 1325 | 1.06 | waterbased | |||
| 1531 | 1.11 | waterbased | |||
| 1944 | 1.13 | waterbased |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| ISF SONIC | 184 - 410 |
| GR | 149 - 410 |
| ISF SONIC | 396 - 1316 |
| ISF SONIC | 1311 - 1944 |
| DLL MSFL | 1500 - 1945 |
| FDC CNL | 1500 - 1945 |
| CAL | 1311 - 1845 |
| HDT | 1500 - 1945 |
| VELOCITY | 930 - 1945 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 149 | NORDLAND GP |
| 598 | UTSIRA FM |
| 742 | NO FORMAL NAME |
| 767 | HORDALAND GP |
| 767 | SKADE FM |
| 925 | NO FORMAL NAME |
| 960 | SKADE FM |
| 975 | NO FORMAL NAME |
| 1055 | SKADE FM |
| 1087 | NO FORMAL NAME |
| 1667 | SHETLAND GP |
| 1667 | BALDER FM |
| 1678 | INTRA BALDER FM SS |
| 1697 | BALDER FM |
| 1701 | INTRA BALDER FM SS |
| 1711 | SELE FM |
| 1716 | LISTA FM |
| 1751 | HEIMDAL FM |
| 1850 | LISTA FM |
| 1862 | HEIMDAL FM |
| 1875 | LISTA FM |
| 1918 | VÅLE FM |
| 1921 | SHETLAND GP |
| 1921 | EKOFISK FM |
| 1930 | 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_7_Completion_Report | (Format:PDF. Size: 97.690 Mb ) |
| 25_11_7_Completion_log | (Format:PDF. Size: 1.250 Mb ) |
|
You need an ACROBAT reader from ADOBE to display the reports in pdf format. |
| WDSS_General_Information | (Format:PDF. Size: 0.213 Mb ) |
| WDSS_lithlog | (Format:PDF. Size: 0.047 Mb ) |
|
|
You need an ACROBAT reader from ADOBE to display the reports in pdf format. |
