Generated 11.02.2012
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Generated 11.02.2012 |
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| NPDID wellbore: | 3771 | |
| Well name: | 25/8-12 | |
| Drilling operator name: | Esso Exploration and Production Norway A/S | |
| Geodetic datum: | ED50 | |
| Coordinates: | 59° 17` 22.57`` N | 2° 26` 39.45`` E |
| UTM coordinates: | 6572584.32 N | 468340.44 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 027 | |
| Area: | NORTH SEA | |
| Discovery: | 25/8-11 RINGHORNE | |
| Field: | BALDER | |
| Drill permit: | 954-L | |
| Drilling facility: | MÆRSK JUTLANDER | |
| Drilling days: | 13 | |
| Wellbore entry date: | 29.05.1999 | |
| Wellbore completion date: | 09.06.1999 | |
| Original wellbore purpose: | APPRAISAL | |
| Wellbore purpose: | APPRAISAL | |
| Wellbore status: | P&A | |
| Wellbore contents: | OIL | |
| Discovery wellbore: | NO | |
| Formation/age with hydrocarbons 1: | HERMOD FM / PALEOCENE | |
| Formation/age with hydrocarbons 2: | STATFJORD FM / EARLY JURASSIC | |
| Seismic location: | ||
| Kelly bushing elevation (KB) [m]: | 23 | |
| Water depth [m]: | 127 | |
| Total Depth (MD) [m]: | 2096 | |
| Final vertical depth (TVD) [m]: | 2085 | |
| Max inclination [°]: | 11.63 | |
| Bottom hole temperature [°C]: | 82 | |
| Oldest penetrated age: | LATE TRIASSIC | |
| Oldest penetrated formation: | SMITH BANK FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 25/8-12 S was drilled to appraise the southern extension of the 25/8-11 discovery on the Ringhorn structure. In the Ringhorn structure, the BCU is also the base of the chalk and represents the overall top of the Lower Jurassic reservoir interval. The primary objective for 25/8-12 S was Lower Jurassic. Paleocene Hermod sands was a secondary target.
Operations and results
Appraisal well 25/8-12 S was spudded with the semi-submersible installation "Mærsk Jutlander" on 29 May 1999 and drilled to TD at 2096 m in the Triassic Smith Bank Formation. The well was drilled with sea water down to 990 m and with oil based mud ("Environment") from 990 m to TD. Top Hermod sands were encountered at 1785.1 m. They consisted of an upper thin sand and a lower massive sand. Several pressure points within the sands confirm a water gradient in the main sand (1790-1803 m). Elevated resistivity indicates hydrocarbons in the interval from 1787-1789 m (1756 - 1758 m TVD SS). Top Statfjord Formation was found at 1905.9 m. MDT data and other open-hole wireline data confirm oil down to (ODT) 1947 m (1914 m TVD SS), and water up to (WUT) 1959 m (1926 m TVD SS). This is consistent with the OWC of 1917.5 m TVD SS established in the 25/8-11 where it was penetrated within a massive sand. Seven MDT oil samples were collected at 1923 m, within the main Jurassic sand reservoir. Pressure was 187.5 bars and temperature (measured, not static) ranged from 80.2 deg C to 80.5 deg C during the sampling. One core was cut from 1905 m to 1941 m in the Statfjord Formation. Well 25/8-12 S was permanently plugged back to the 9 5/8" casing at 984 m on June 8 1999 for sidetrack 25/8-12 A. It is classified as an oil appraisal well.
Testing
No drill stem test was performed
Interval [m]: 1000.00 - 2096.00
Core length [m]: 33.80
| Core number | Interval |
|---|---|
| 1 | 1905.00-1938.80 |
 1905-1910m |
 1910-1915m |
 1915-1920m |
 1920-1925m |
 1925-1930m |
 1930-1935m |
 1935-1939m |
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 | 211.0 | 36 | 213.0 | |
| INTERM. | 9 5/8 | 984.0 | 12 1/4 | 990.0 | |
| OPEN HOLE | 2096.0 | 8 1/2 | 2096.0 | 1.62 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 860 | 1.33 | 30.0 | OIL (ENVIRON) | ||
| 1385 | 1.32 | 28.0 | OIL (ENVIRON) | ||
| 1905 | 1.32 | 31.0 | OIL (REGULAR) | ||
| 2096 | 1.32 | 25.0 | OIL (ENVIRON) |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| MWD LWD - DIR | 153 - 213 |
| MWD LWD - DIR EWR-4 DGR | 213 - 990 |
| MWD LWD - DIR EWR-4 DGR | 990 - 2096 |
| AITH IPLT DSI | 986 - 2099 |
| MDT GR | - |
| CMR GR | 1690 - 2040 |
| VSP | 505 - 2080 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 150 | NORDLAND GP |
| 560 | UTSIRA FM |
| 672 | NO FORMAL NAME |
| 728 | HORDALAND GP |
| 728 | SKADE FM |
| 954 | NO FORMAL NAME |
| 1150 | GRID FM |
| 1159 | NO FORMAL NAME |
| 1699 | ROGALAND GP |
| 1699 | BALDER FM |
| 1766 | SELE FM |
| 1785 | HERMOD FM |
| 1788 | SELE FM |
| 1789 | HERMOD FM |
| 1802 | SELE FM |
| 1839 | LISTA FM |
| 1880 | VÅLE FM |
| 1884 | SHETLAND GP |
| 1906 | NO GROUP DEFINED |
| 1906 | STATFJORD FM |
| 2040 | NO GROUP DEFINED |
| 2040 | SMITH BANK FM |
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Composite log (Format:PDF. Size: 0.370 Mb) |
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No geochemical data presently available. Regional geochemical studies which include data from this well may however be filed on a different well.
No documents presently available.
