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Generated 10.02.2012 |
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| NPDID wellbore: | 184 | |
| Well name: | 25/11-2 | |
| Drilling operator name: | Esso Exploration and Production Norway A/S | |
| Geodetic datum: | ED50 | |
| Coordinates: | 59° 13` 01.55`` N | 2° 24` 35.10`` E |
| UTM coordinates: | 6564527.25 N | 466301.09 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 001 | |
| Area: | NORTH SEA | |
| Discovery: | 25/11-1 BALDER | |
| Field: | BALDER | |
| Drill permit: | 47-L | |
| Drilling facility: | GLOMAR GRAND ISLE | |
| Drilling days: | 12 | |
| Wellbore entry date: | 13.09.1970 | |
| Wellbore completion date: | 24.09.1970 | |
| Original wellbore purpose: | APPRAISAL | |
| Wellbore purpose: | APPRAISAL | |
| Wellbore status: | P&A | |
| Wellbore contents: | SHOWS | |
| Discovery wellbore: | NO | |
| Seismic location: | LINE SC 72 & sp 6660 | |
| Kelly bushing elevation (KB) [m]: | 10 | |
| Water depth [m]: | 130 | |
| Total Depth (MD) [m]: | 1824 | |
| Final vertical depth (TVD) [m]: | 1824 | |
| Max inclination [°]: | ||
| Bottom hole temperature [°C]: | 61 | |
| Oldest penetrated age: | PALEOCENE | |
| Oldest penetrated formation: | SELE FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 25/11-2 was drilled to appraise the 25/11-1 Balder discovery on the Utsira High in the North Sea. The objective was to define the continuity and reservoir thickness of the Early Eocene oil bearing sands in a northward direction from well 25/11-1 and a southward direction from well 25/8-1.
Operations and results
Appraisal well 25/11-2 was spudded with the vessel Glomar Grand Isle on 13 September 1970 and drilled to TD at 1823 m in the Paleocene Sele Formation. No significant problems occurred during the operations. The well was drilled with seawater/gel down to 175 m, with seawater/Spersene/ XP-20/Salinex from 175 m to 945 m, and with fresh water/ Spersene/XP-20 from 945 to TD.
The well penetrated the Utsira Formation and several Skade Formation sand units and then entered a ca 600 m thick section of shales belonging to the lower Hordaland Group before top Balder formation was encountered at 1699 m. The Balder Formation contained several thin Intra Balder Formation sandstones, of which a seven meter thick sandstone at 1727 m was the thickest. The sands were oil bearing down to 1747 m. Hermod sandstones were penetrated from 1780 to 1817 m. They had better reservoir properties than the Intra Balder Formation sands, but were water bearing without shows.
No conventional cores were cut in the well. Out of four attempts with the Formation Interval Tester (FIT) three tests were seal failures while test no 4, at 1728.5 m, was successful and recovered 0.33 Sm3 gas, 6.9 l oil, and 3.25 l oil and gas cut mud.
The well was permanently abandoned on 24 September as an oil appraisal.
Testing
No drill stem test was performed.
Interval [m]: 405.38 - 1822.71
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 | 175.0 | 36 | 180.0 | |
| SURF.COND. | 13 3/8 | 388.0 | 17 1/2 | 405.0 | |
| INTERM. | 9 5/8 | 945.0 | 12 1/4 | 960.0 | |
| OPEN HOLE | 1856.0 | 8 1/2 | 1856.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 175 | seawater/ge | ||||
| 945 | seawater/sp | ||||
| 1823 | water/spers |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| IEL | 944 - 1823 |
| NHC SON GR | 944 - 1819 |
| GR | 137 - 944 |
| FDC | 944 - 1822 |
| VELOCITY | 944 - 1824 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 140 | NORDLAND GP |
| 582 | UTSIRA FM |
| 716 | NO FORMAL NAME |
| 747 | HORDALAND GP |
| 747 | SKADE FM |
| 939 | NO FORMAL NAME |
| 997 | SKADE FM |
| 1015 | NO FORMAL NAME |
| 1086 | SKADE FM |
| 1092 | NO FORMAL NAME |
| 1699 | ROGALAND GP |
| 1699 | BALDER FM |
| 1727 | INTRA BALDER FM SS |
| 1734 | BALDER FM |
| 1765 | SELE FM |
| 1780 | HERMOD FM |
| 1817 | SELE 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_2_Completion_Report | (Format:PDF. Size: 3.129 Mb ) |
| 25_11_2_Completion_log | (Format:PDF. Size: 0.985 Mb ) |
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| WDSS_General_Information | (Format:PDF. Size: 0.147 Mb ) |
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| NPD_Paper_No.28_Lithology_Balder area__Well_25_11_2 | (Format:PDF. Size: 18.130 Mb ) |
| NPD_Paper_No.28_Lithologic_Correlation_chart__Well_25_11_2 | (Format:PDF. Size: 0.464 Mb ) |
| NPD_Paper_No.28_Log_Correlation_chart_Profile_NE-SW__Well_25_11_2 | (Format:PDF. Size: 0.399 Mb ) |
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