1、GENERAL INTRODUCTION
The tool uses ultrasonic wave as its data carrier. By transmitlingultrasonic wave to the borehole wall or casing wall, the imaginglogging can be carried out with respect to the amplitudeand travel time of the retum wave. With measured acousticimages of open hole, the formation fracture density, deviation,azimuth as well as the fracture and cavem distribution can beacquired. For cased hole, such measurement as perforationpoint, casing corrosion and deformation, and cement bond canbe perfommed.
2、TECHNICAL SPECIFICATIONS
| Max temperature | 175°C (347°F ), 2h |
| Max pressure | 140MPa (20,305psi) |
| Length | 4.7m (15.4ft) |
| ID | Ø92mm (3.62in) |
| Transducer frequency |
350kHz (flat and curve) 500kHz (flat piezoelectric ceramics) |
| Transducer type | - |
| Borehole size | 140 - 305mm (5.5 - 12.0in) |
| Casing thickness range | 4.0 - 14.9mm (0.18 - 0.59in) |
| Casing thickness accuracy | ±0.5mm (0.02in) |
| Mud weight range | ≤1.4g/cm³ |
| Sampling points per circle | 100/200/250 |
| Scanning speed (open hole) | 14scan/s |
| Scanning speed (cased hole) | 44scan/s |
| Vertical scanning speed (open hole) | 18.3m/min (60ft/min) |
| Vertical scanning speed (cased hole) |
12.2m/min (3.69scan/m) 12.8m/min (42ft/min) |
| Vertical sampling accuracy (open hole) | ±6.76mm (0.3in) |
| Vertical sampling accuracy (cased hole) | ±7.62mm (0.3in) |
| Recommended logging speed (open hole) | 1100m/h (3600ft/h) |
| Recommended logging speed (cased hole) | 914m/h (3000ft/h) |
3、APPLICATION
OPEN HOLE
- Fracture and karst
- cave detection
- Formation uniformity!identification
- Thin bed identification
- 3D borehole diameter
CASED HOLE
- Intemal casing surfacecheck
- Cement bond evaluation
- Casing thickness
- 3D borehole diameter
- Borehole wall imaging
