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Generated 11.02.2012 |
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| NPDID wellbore: | 3921 | |
| Well name: | 6407/6-5 | |
| Drilling operator name: | Den norske stats oljeselskap a.s | |
| Geodetic datum: | ED50 | |
| Coordinates: | 64° 38` 34.90`` N | 7° 40` 03.80`` E |
| UTM coordinates: | 7169519.03 N | 436337.45 E |
| UTM zone: | 32 | |
| Drilled in production licence: | 092 | |
| Area: | NORWEGIAN SEA | |
| Discovery: | 6407/6-3 MIKKEL | |
| Field: | MIKKEL | |
| Drill permit: | 967-L | |
| Drilling facility: | BYFORD DOLPHIN | |
| Drilling days: | 43 | |
| Wellbore entry date: | 15.11.1999 | |
| Wellbore completion date: | 27.12.1999 | |
| Original wellbore purpose: | APPRAISAL | |
| Wellbore purpose: | APPRAISAL | |
| Wellbore status: | P&A | |
| Wellbore contents: | GAS | |
| Discovery wellbore: | NO | |
| Formation/age with hydrocarbons 1: | FANGST GP / MIDDLE JURASSIC | |
| Formation/age with hydrocarbons 2: | TOFTE FM / EARLY JURASSIC | |
| Seismic location: | INLINE 1656-XLINE 1726 ST 98M10 | |
| Kelly bushing elevation (KB) [m]: | 25 | |
| Water depth [m]: | 225 | |
| Total Depth (MD) [m]: | 2759 | |
| Final vertical depth (TVD) [m]: | 2758 | |
| Max inclination [°]: | 5.10 | |
| Bottom hole temperature [°C]: | 111 | |
| Oldest penetrated age: | EARLY JURASSIC | |
| Oldest penetrated formation: | TILJE FM | |
| Note: All depths, except the water depth, are relative to kelly bushing (RKB) | ||
General
The main objective of well 6407/6-5 was to appraise hydrocarbons in the Fangst Group and to enhance the understanding of the hydrocarbon characteristics, contact and distribution within the Mikkel structure. Block 6407/6 is situated in the fault zone separating the Tr&ndelag Platform and the Halten Terrace. The fault zone where the structural element Mikkel is situated is called the Bremstein Fault Complex. Secondary targets were to investigate the degree of communication with the gas proven in well 6407/6-3, and to investigate the presence of hydrocarbons in the Tofte and Tilje Formations of the B&t Group.
Operations and results
Appraisal well 6407/6-5 was spudded with the semi-submersible installation "Byford Dolphin" on 15 November 1999 and drilled without major problems to a total depth of 2759 m in the Early Jurassic Tilje Formation. The well was drilled with seawater and bentonite down to 423 m, with KCl/PAC mud from 423 m to 1202 m, and with oil based mud ("Versavert") from 1202 m to TD. Oil and gas were encountered in the Fangst Group. The GOC was defined at 2543 m TVD MSL and an OWC was found at 2563 m TVD MSL, based on pressure gradients. This coincided with the hydrocarbon contacts proven in well 6407/6-3. MDT sampling gave gas samples from the Garn Formation (2382 m), oil from the Tofte Formation (2581 m), and water from the Tofte Formation (2626 m). Two cores were cut in the Ile, Ror, and Tofte Formations in the interval 2490 m to 2598 m. Recovery was 100 %. The well was permanently abandoned as a gas appraisal well on 27 December 1999.
Testing
No drill stem test was performed
Interval [m]: 600.00 - 2760.00
Core length [m]: 107.35
| Core number | Interval |
|---|---|
| 1 | 2490.00-2544.80 |
| 2 | 2545.00-2597.54 |
 2490-2495m |
 2495-2500m |
 2500-2505m |
 2505-2510m |
 2510-2525m |
 2515-2520m |
 2520-2525m |
 2525-2530m |
 2530-2535m |
 2535-2540m |
 2540-2544m |
 2545-2550m |
 2555-2560m |
 2560-2565m |
 2565-2570m |
 2570-2575m |
 2575-2580m |
 2580-2585m |
 2585-2590m |
 2590-2595m |
 2595-2598m |
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 | 30 | 310.0 | 36 | 311.0 | |
| INTERM. | 13 3/8 | 421.0 | 17 1/2 | 422.0 | 1.28 |
| INTERM. | 9 5/8 | 1193.0 | 12 1/4 | 1193.0 | 1.63 |
| OPEN HOLE | 2759.0 | 8 1/2 | 2759.0 |
| Depth MD [m] | Mud weight [g/cm3] | Visc. [MPa.s] | Yield [pnt Pa.] | Mud type | Date measured |
|---|---|---|---|---|---|
| 423 | 1.25 | 38.0 | BENTONITE/FW | ||
| 426 | 1.20 | 15.0 | CMC/BENTONITE | ||
| 520 | 1.22 | 11.0 | KCL/PAC/XANVIS | ||
| 548 | 1.20 | DUMMY | |||
| 1203 | 1.22 | 12.0 | KCL/PAC/XANVIS | ||
| 1206 | 1.51 | 26.0 | KCL/PAC/XANVIS | ||
| 1850 | 1.56 | 32.0 | VERSAVERT | ||
| 2315 | 1.56 | 32.0 | VERSAVERT | ||
| 2490 | 1.56 | 27.0 | VERSAVERT | ||
| 2545 | 1.56 | 30.0 | VERSAVERT | ||
| 2599 | 1.56 | 35.0 | VERSAVERT | ||
| 2614 | 1.56 | 31.0 | VERSAVERT | ||
| 2759 | 1.56 | 37.0 | VERSAVERT |
No drill stem test in this wellbore.
| Log type | Intervals logged [m] |
|---|---|
| MWD | 314 - 2759 |
| LWD | 2350 - 2759 |
| PEX AIT DSI GR | 1193 - 2393 |
| MDT GR | 2383 - 2629 |
| VSP | 1000 - 2629 |
| Top depth [m] | Litostratigraphic unit |
|---|---|
| 250 | NORDLAND GP |
| 250 | NAUST FM |
| 1161 | KAI FM |
| 1362 | HORDALAND GP |
| 1362 | BRYGGE FM |
| 1861 | ROGALAND GP |
| 1861 | TARE FM |
| 1924 | TANG FM |
| 2023 | SHETLAND GP |
| 2343 | CROMER KNOLL GP |
| 2359 | VIKING GP |
| 2359 | SPEKK FM |
| 2377 | MELKE FM |
| 2381 | FANGST GP |
| 2381 | GARN FM |
| 2444 | NOT FM |
| 2485 | ILE FM |
| 2558 | BÅT GP |
| 2558 | ROR FM |
| 2581 | TOFTE FM |
| 2628 | ROR FM |
| 2661 | TOFTE FM |
| 2672 | ROR FM |
| 2709 | TILJE FM |
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Composite log (Format:PDF. Size: 0.364 Mb) |
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