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Generated 11.02.2012 |
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| NPDID wellbore: | 1078 | |
| Well name: | 6507/7-9 | |
| Drilling operator name: | Conoco Norway Inc. | |
| Geodetic datum: | ED50 | |
| Coordinates: | 65° 19` 31.55`` N | 7° 19` 03.95`` E |
| UTM coordinates: | 7245951.29 N | 421641.08 E |
| UTM zone: | 32 | |
| Drilled in production licence: | 095 | |
| Area: | NORWEGIAN SEA | |
| Discovery: | 6507/7-2 HEIDRUN | |
| Field: | HEIDRUN | |
| Drill permit: | 555-L | |
| Drilling facility: | TREASURE HUNTER | |
| Drilling days: | 5 | |
| Wellbore entry date: | 04.08.1987 | |
| Wellbore completion date: | 08.08.1987 | |
| Original wellbore purpose: | APPRAISAL | |
| Wellbore purpose: | APPRAISAL | |
| Wellbore status: | P&A | |
| Wellbore contents: | DRY | |
| Discovery wellbore: | NO | |
| Seismic location: | CO 87 229 SP 35 | |
| Kelly bushing elevation (KB) [m]: | 25 | |
| Water depth [m]: | 345 | |
| Total Depth (MD) [m]: | 850 | |
| Final vertical depth (TVD) [m]: | 850 | |
| Max inclination [°]: | 2.10 | |
| Bottom hole temperature [°C]: | ||
| Oldest penetrated age: | PLIOCENE | |
| Oldest penetrated formation: | NAUST FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
Well 6507/7-9 was drilled in the Northern part of the Haltenbanken area, near the crest of the Heidrun Field structure, at the proposed site for the production platform. The well was a pilot hole for the Heidrun Field production wells. It should evaluate the top 150 m of sediments below seabed as foundation for the Heidrun Production Platform, and it should drill to 850 m RKB to ensure that the section to be penetrated by the conductors and surface pipes for all production wells, is free of shallow gas. A site survey had detected five shallow gas anomalies at 505, 558, 609, 708, and 762 m.
Operations and results
Appraisal well 6507/7-9 was spudded with the semi-submersible installation Treasure Hunter on 4 August 1987 and drilled to TD at 850 m in Pliocene sediments of the Naust Formation. No significant problems were encountered during drilling. The well was drilled all through with seawater and pre-hydrated bentonite and returns to the seabed. A sub-sea camera was monitoring the wellhead area.
Boulders were encountered between 380 m and 400 m, but created no torquing problems while drilling. Wire line logs identified sands at 600 to 612 m, at 695 to 698 m, and at 749 to 757 m. Gas bubbles were observed emanating from the wellhead while drilling the sand at 600 - 612 m. The gas bubbles decreased after drilling the section and ceased while circulating seawater around to the seabed, indicating hydrostatic pressure. The other sands produced no gas bubbles to surface, and none of the sands showed any signs of high resistivity. It was concluded that shallow gas should not be a problem in drilling future wells from the Heidrun Platform on this location, although shallow gas-filled sands in neighbouring locations could not be excluded.
No cores were cut and no wire line fluid samples taken in this well.
The well was permanently abandoned on 8 August 1987 as a dry well
Testing
No drill stem test was performed
No cuttings in this wellbore.
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 | 13 3/8 | 474.0 | 17 1/2 | 659.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 370 | 1.01 | WATER BASED | 1987.08.04 | ||
| 474 | 1.03 | WATER BASED | 1987.08.05 | ||
| 659 | 1.03 | WATER BASED | 1987.08.06 | ||
| 850 | 1.03 | WATER BASED | 1987.08.07 | ||
| 850 | 1.03 | WATER BASED | 1987.08.10 |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| MWD - GR RES DIR | 466 - 850 |
| DLL LSS GR CAL | 370 - 847 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 370 | NORDLAND GP |
| 370 | NAUST 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.
No documents presently available.
| WDSS_General_Information | (Format:PDF. Size: 0.293 Mb ) |
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