Component
|
Specification
|
|---|---|
| Borehole magnetometer | Three-component fluxgate |
| Power supply | 50 V/0.25 A (12 W) |
| Random walk of fluxgate sensors | <0.1 nT |
| Range | ±50 µT |
| Resolution | 6.1 nT |
| Data transmission | Digital two-wire Manchester encoded |
| Sample rate | Eight readings from 8 channels/s |
| Data acquisition system | Personal computer (DOS) |
| Tool weight | 68 kg |
| Tool length | 3.5 m |
| Tool diameter | 86 mm (3.375 in) |
| Housing | Low magnetic monel |
| Nonmagnetic bronze centralizers (2) | 16.3 kg each |
| Maximum operation temperature | 0°-700°C (limited by FOG) |
| Maximum operation pressure | 70 MPa |
| Recommended logging speed | 360 m/hr |
| Maximum logging speed | 3600 m/hr (limited by hole diameter) |
| Tool navigation system | Three FOG µFORS-36 m (LITEF) |
Note: FOG = fiber-optic gyro, µFORS = miniature fiber-optic rate sensor.