Generated 10.02.2012
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Generated 10.02.2012 |
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| NPDID wellbore: | 366 | |
| Well name: | 25/11-5 | |
| Drilling operator name: | Esso Exploration and Production Norway A/S | |
| Geodetic datum: | ED50 | |
| Coordinates: | 59° 12` 09.32`` N | 2° 21` 55.58`` E |
| UTM coordinates: | 6562934.90 N | 463755.93 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 001 | |
| Area: | NORTH SEA | |
| Discovery: | 25/11-1 BALDER | |
| Field: | BALDER | |
| Drill permit: | 106-L | |
| Drilling facility: | DRILLMASTER | |
| Drilling days: | 36 | |
| Wellbore entry date: | 03.04.1974 | |
| Wellbore completion date: | 08.05.1974 | |
| Original wellbore purpose: | WILDCAT | |
| 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: | HERMOD FM / PALEOCENE | |
| Seismic location: | LINE SC 73-15 & sp 2125 | |
| Kelly bushing elevation (KB) [m]: | 24 | |
| Water depth [m]: | 124 | |
| Total Depth (MD) [m]: | 2164 | |
| Final vertical depth (TVD) [m]: | ||
| Max inclination [°]: | ||
| Bottom hole temperature [°C]: | 60 | |
| Oldest penetrated age: | TRIASSIC | |
| Oldest penetrated formation: | NO GROUP DEFINED | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 25/11-5 was drilled ca 4 km north west of the 25/11-1 Balder discovery well on the Utsira High in the North Sea. The well was designed to evaluate a sand build up and/or structural closure at the Middle Paleocene horizon top. The location was mapped structurally high to the adjacent wells 25/11-1, 25/11-2, 25/10-1, and 25/10-3.
Operations and results
Appraisal well 25/11-5 was spudded with the drillship Drillmaster on 3 April 1974 and drilled to TD at 2164 m in Triassic red-grey clays, and grey-green shale. Sloughing shale was the only drilling problem and this was overcome by converting the Drispac mud system to a ligno-gel seawater mud system. The well was drilled with Drispac from approximately 1000 to 1400 m, and with lignosulphonate/gel/seawater from ca 1400 m to TD.
The well penetrated the Utsira Formation and a Skade Formation sand and then entered a ca 700 m thick section of shales belonging to the lower Hordaland Group before top Balder formation was encountered at 1661 m. Significant oil bearing sands in the interval from 1714 to 1771 m were confirmed by sidewall cores and Schlumberger electric logs. The lower part of this interval tested oil at good rates. Additional shows in traces of sand in cuttings at 1838 - 1847 m were believed to be sloughings from the oil sand above.
One conventional core was cut from 1723.3 to 1725.5 m. Six attempts at FIT's were attempted with one successful at 1744.1 m. This test recovered 0.33 Sm3 gas, 4.5 l oil, 2.3 l filtrate and 0.8 l mud.
The well was permanently abandoned on 8 May1974 as an oil appraisal.
Testing
A test through perforations at 1750 to 1765 m in the Hermod Formation produced at an average rate of 634 Sm3 oil and 29283 Sm3 gas /day. The GOR was 46.1 Sm3/Sm3 and the oil gravity was 24.2 deg API (0.91 g/cm3).
Interval [m]: 198.12 - 2164.08
Core length [m]: 2.13
| Core number | Interval |
|---|---|
| 1 | 5654-5661' |
No scanned core photos available
| Test type: | Bottle test number: | Bottle interval [m]: | Fluid type: | Test date and time: |
|---|---|---|---|---|
| DST | DST1 | 1765.000 - 1750.000 | 1974.04.30 00:00 |
| Type | Casing diam. [inch] | Depth below KB [m] | Hole diam. [inch] | Hole depth below KB [m] | Lot mud eqv. [g/cm3] |
|---|---|---|---|---|---|
| CONDUCTOR | 30 | 187.0 | 36 | 190.0 | |
| SURF.COND. | 13 3/8 | 397.0 | 17 1/2 | 411.0 | |
| INTERM. | 9 5/8 | 1397.0 | 12 1/4 | 1412.0 | |
| LINER | 7 | 1890.0 | 8 1/2 | 2164.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 188 | seawater/ge | ||||
| 1400 | 1.23 | seawater/lg | |||
| 2163 | 1.22 | water/spers |
| 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 | 1750 - 1765 | 17.800 | 0 |
| Test no. | Oil [Sm3/day] | Gas [Sm3/day] | Oil grav. [g/cm3] | Gas grav. rel.air | GOR [m3/m3] |
|---|---|---|---|---|---|
| 1.0 | 636 | 28371 | .910 | 44 |
| Log type | Intervals logged [m] |
|---|---|
| DIL | 396 - 2162 |
| SGR | 396 - 2161 |
| FDC CNL | 1397 - 2163 |
| DIPMETER | 1397 - 2162 |
| VELOCITY | 457 - 2154 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 147 | NORDLAND GP |
| 581 | UTSIRA FM |
| 700 | NO FORMAL NAME |
| 759 | HORDALAND GP |
| 759 | SKADE FM |
| 961 | NO FORMAL NAME |
| 1661 | ROGALAND GP |
| 1661 | BALDER FM |
| 1698 | INTRA BALDER FM SS |
| 1701 | BALDER FM |
| 1724 | SELE FM |
| 1731 | HERMOD FM |
| 1771 | SELE FM |
| 1773 | LISTA FM |
| 1798 | HEIMDAL FM |
| 1873 | LISTA FM |
| 1917 | SHETLAND GP |
| 1935 | CROMER KNOLL GP |
| 1950 | VIKING GP |
| 1950 | DRAUPNE FM |
| 1955 | NO GROUP DEFINED |
| 1955 | STATFJORD FM |
| 2087 | NO GROUP DEFINED |
No composite log presently available.
| File 1 | (Format:PDF. Size: 0.796 Mb ) |
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| 25_11_5_Completion_Report | (Format:PDF. Size: 4.579 Mb ) |
| 25_11_5_Completion_log | (Format:PDF. Size: 1.323 Mb ) |
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| WDSS_General_Information | (Format:PDF. Size: 0.238 Mb ) |
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