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Generated 10.02.2012 |
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| NPDID wellbore: | 367 | |
| Well name: | 25/11-6 | |
| Drilling operator name: | Esso Exploration and Production Norway A/S | |
| Geodetic datum: | ED50 | |
| Coordinates: | 59° 10` 58.63`` N | 2° 23` 39.13`` E |
| UTM coordinates: | 6560733.03 N | 465378.94 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 001 | |
| Area: | NORTH SEA | |
| Discovery: | 25/11-1 BALDER | |
| Field: | BALDER | |
| Drill permit: | 201-L | |
| Drilling facility: | NORSKALD | |
| Drilling days: | 43 | |
| Wellbore entry date: | 20.08.1978 | |
| Wellbore completion date: | 01.10.1978 | |
| 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]: | 126 | |
| Total Depth (MD) [m]: | 1948 | |
| Final vertical depth (TVD) [m]: | ||
| Max inclination [°]: | 4.70 | |
| Bottom hole temperature [°C]: | 65 | |
| Oldest penetrated age: | EARLY CRETACEOUS | |
| Oldest penetrated formation: | CROMER KNOLL GP | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 25/11-6 was drilled ca 1 km west of the 25/11-1 Balder discovery well on the Utsira High in the North Sea. The primary objective was to delineate the Paleocene E-70 oil sand and older sands which are developed as topographic mounds (stratigraphic traps) in the Balder Field area. A secondary objective was Danian sand which had oil shows in an offset well.
Operations and results
Appraisal well 25/11-6 was spudded with the semi-submersible installation Norskald on 20 August 1978 and drilled to TD at 1948 m in the Early Cretaceous Cromer Knoll Group. The well was drilled with seawater/gel/lignosulphonate.
The well penetrated the Utsira Formation, a Skade Formation sand and a Grid Formation sand and then penetrated a ca 175 m thick section of shales belonging to the lower Hordaland Group before top Balder formation was encountered at 1646 m. An 8 m thick shaly Intra Balder Formation sand at 1664 m had some shows and appeared to be oil bearing on the logs. Two Paleocene Heimdal Formation sand units with tops at 1717.5 m and 1763.0 m were found oil bearing down to a clear oil-water contact at 1785.3 m in the lower sand unit. This defines the OWC of the Balder field at 1760 m MSL. The Danian sand (Ty Formation) was encountered at 1877 m, but was water wet.
Five cores were cut in the Lista and Heimdal Formation, recovering a total of 25.5 m core from the interval 1713 to 1797 m. Wire line fluid samples were attempted, but with no success.
The well was permanently abandoned on 1 October 1978 as an oil appraisal.
Testing
One production test was performed in the interval 1725 to 1740 m in the upper Heimdal Formation sand unit. It produced 485 Sm3 oil and 18123 Sm3 gas with 3-4% sand/day through a 35/64" choke. The GOR was 37 Sm3/Sm3, the oil gravity was 24.3 deg API, and the gas gravity was 0.61 (air = 1). No H2S or Inert gas was detected.
Interval [m]: 200.00 - 1945.00
No cores in this wellbore.
No scanned core photos available
No palynological slides in this wellbore.
| Test type: | Bottle test number: | Bottle interval [m]: | Fluid type: | Test date and time: |
|---|---|---|---|---|
| DST | DST1 | 1740.000 - 1725.000 | 1978.09.21 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 | 187.0 | |
| INTERM. | 13 3/8 | 394.0 | 17 1/2 | 410.0 | |
| INTERM. | 9 5/8 | 1310.0 | 12 1/4 | 1327.0 | |
| LINER | 7 | 1927.0 | 8 1/2 | 1948.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 995 | 1.13 | waterbased | |||
| 1787 | 1.13 | waterbased | |||
| 1947 | 1.14 | waterbased |
| 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 | 1725 - 1740 | 13.9 | 17.600 | 0 |
| Test no. | Oil [Sm3/day] | Gas [Sm3/day] | Oil grav. [g/cm3] | Gas grav. rel.air | GOR [m3/m3] |
|---|---|---|---|---|---|
| 1.0 | 485 | 1800000 | .900 | .600 | 210 |
| Log type | Intervals logged [m] |
|---|---|
| ISF SONIC | 186 - 405 |
| GR | 152 - 405 |
| ISF SONIC | 394 - 1308 |
| ISF SONIC MSFL | 1301 - 1948 |
| DLL | 1309 - 1945 |
| FDC CNL | 1304 - 1948 |
| HDT | 1309 - 1947 |
| VELOCITY | - 1948 |
| CBL VDL | 299 - 1302 |
| TEMP | 108 - 1757 |
| CCL GR | 1612 - 1785 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 151 | NORDLAND GP |
| 608 | UTSIRA FM |
| 730 | NO FORMAL NAME |
| 752 | HORDALAND GP |
| 752 | SKADE FM |
| 1011 | NO FORMAL NAME |
| 1080 | SKADE FM |
| 1100 | NO FORMAL NAME |
| 1462 | GRID FM |
| 1471 | NO FORMAL NAME |
| 1646 | ROGALAND GP |
| 1646 | BALDER FM |
| 1664 | INTRA BALDER FM SS |
| 1672 | BALDER FM |
| 1688 | SELE FM |
| 1702 | LISTA FM |
| 1718 | HEIMDAL FM |
| 1848 | LISTA FM |
| 1864 | VÅLE FM |
| 1877 | TY FM |
| 1903 | SHETLAND GP |
| 1903 | EKOFISK FM |
| 1908 | TOR FM |
| 1932 | CROMER KNOLL GP |
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_6_Completion_Report | (Format:PDF. Size:152.342 Mb ) |
| 25_11_6_Completion_log | (Format:PDF. Size: 0.984 Mb ) |
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| WDSS_General_Information | (Format:PDF. Size: 0.211 Mb ) |
| WDSS_lithlog | (Format:PDF. Size: 0.048 Mb ) |
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