Generated 11.02.2012
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Generated 11.02.2012 |
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| NPDID wellbore: | 2990 | |
| Well name: | 36/7-2 | |
| Drilling operator name: | Norsk Hydro Produksjon AS | |
| Geodetic datum: | ED50 | |
| Coordinates: | 61° 18` 23.50`` N | 4° 19` 47.00`` E |
| UTM coordinates: | 6797817.45 N | 571225.20 E |
| UTM zone: | 31 | |
| Drilled in production licence: | 153 | |
| Area: | NORTH SEA | |
| Discovery: | 36/7-2 | |
| Field: | NOT YET DEVELOPED | |
| Drill permit: | 869-L | |
| Drilling facility: | WEST VANGUARD | |
| Drilling days: | 21 | |
| Wellbore entry date: | 02.09.1997 | |
| Wellbore completion date: | 22.09.1997 | |
| Original wellbore purpose: | WILDCAT | |
| Wellbore purpose: | WILDCAT | |
| Wellbore status: | P&A | |
| Wellbore contents: | OIL | |
| Discovery wellbore: | YES | |
| Formation/age with hydrocarbons 1: | FENSFJORD FM / MIDDLE JURASSIC | |
| Seismic location: | NH 9205 - 113 A & SP. 625 | |
| Kelly bushing elevation (KB) [m]: | 22 | |
| Water depth [m]: | 269 | |
| Total Depth (MD) [m]: | 1435 | |
| Final vertical depth (TVD) [m]: | 1435 | |
| Max inclination [°]: | 1.80 | |
| Bottom hole temperature [°C]: | 34 | |
| Oldest penetrated age: | PRE-DEVONIAN | |
| Oldest penetrated formation: | BASEMENT | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 36/7-2 was drilled on the Øygarden Fault Complex, ca 14 km west of the outer skerries of Bulandet in Sogn og Fjordane county. The primary target were the Late Jurassic Sognefjord and the Upper Jurassic Fensfjord formations.
Operations and results
Wildcat well 36/7-2 was spudded with the semi-submersible installation West Vanguard on 2 September 1997 and drilled to TD at 1435 m in basement rock. An anchor test was performed after setting the 13 3/8" casing shoe. Anchor no. 2 and 3 failed the test to 180 ton and slipped at 170 ton. Piggyback anchors were set on anchor no. 2, while main anchor no. 3 was lost. Fishing for the anchor chain was delayed 47.5 hrs due to bad weather. The anchor chain was retrieved and the anchor reset with two piggy backs. Both anchors then stood a successful test. The well was drilled with seawater and hi-vis pills down to 591 m and with ANCO 2000 from 591 m to TD.
The well discovered heavily biodegraded oil in the Middle Jurassic deltaic sandstone reservoir of the Fensfjord Formation. The overlying Sognefjord Formation sands were tight and contained no hydrocarbons. A 32.5 m oil column was proven from 931.5 to ca 964.0 m. The exact level of the oil-water contact could not be determined as it was in a shaley zone. Oil shows on cuttings were recorded from 915 m down to 1045 m. The reservoir zone of the Fensfjord Formation was divided into two units, from which only the upper had good reservoir properties.
No conventional cores were cut, but 60 sidewall cores were taken from 603 to 1408 m with a recovery of 56 samples. The MDT tool was run and 23 good pressure points were acquired in addition to a fluid sample at 934.5 m.
The well was completed on 22 September 1997 as an oil discovery.
Testing
No drill stem test was performed.
Interval [m]: 595.00 - 1435.00
No cores in this wellbore.
No scanned core photos available
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 | 340.0 | 36 | 355.0 | |
| SURF.COND. | 13 3/8 | 587.0 | 17 1/2 | 591.0 | 1.48 |
| OPEN HOLE | 925.0 | 12 1/4 | 925.0 | ||
| OPEN HOLE | 1435.0 | 8 1/2 | 1435.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 592 | 1.05 | WATER BASED | |||
| 1117 | 1.15 | 20.0 | WATER BASED | ||
| 1435 | 1.16 | 18.0 | WATER BASED |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| MWD - GR RES DIR | 291 - 1435 |
| PEX AMS | 291 - 1433 |
| ARRAY SONIC GR AMS | 586 - 1431 |
| VSP GR | 586 - 1430 |
| MDT GR AMS | 918 - 1100 |
| MDT GR AMS | 934 - 1375 |
| CST GR AMS | 603 - 1408 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 291 | NORDLAND GP |
| 648 | ROGALAND GP |
| 648 | BALDER FM |
| 678 | CROMER KNOLL GP |
| 678 | SOLA FM |
| 774 | ÅSGARD FM |
| 880 | VIKING GP |
| 880 | DRAUPNE FM |
| 917 | SOGNEFJORD FM |
| 936 | HEATHER FM |
| 947 | FENSFJORD FM |
| 1363 | NO GROUP DEFINED |
| 1363 | STATFJORD FM |
| 1429 | BASEMENT |
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