| Customization: | Available |
|---|---|
| Accuracy: | Ultrasonic Hole Wall Imager |
| Horizontal Line: | Ultrasonic Hole Wall Imager |
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Portable Pipeline 3D imaging system Ultrasonic Hole Wall Imager
1.Introduction:
The ultrasonic borehole wall imaging detector uses a high-frequency ultrasonic probe to rotate and scan at high speed in the hole. The integrity of the rock, acoustic impedance and changes in the wellbore diameter will cause changes in the echo amplitude. The measured reflected wave amplitude and propagation time will form an expanded wellbore wall ultrasonic image at 360° in the wellbore, thereby detecting changes in aperture, crack width, inclination, azimuth and distribution of karst fracture zones, providing reliable geological basic data for engineering exploration.
It mainly solves the application scenarios that cannot be detected by optical drilling television, such as oil, muddy water (mud) holes, coal seam holes, corroded pipelines, etc.
2. Technical Specification:
| Ultrasonic frequency | 1Mhz |
| Lateral accuracy | 512 points/circle |
| Scanning speed | 6 circles/second |
| Lowering speed | 0-3 meters/minute |
| Imaging resolution | 0.5mm |
| probe diameter | 55mm |
| probe length | 80cm |
| measurement hole depth | 300meters |
| adaption environment | oil,clear water,muddy water,muddy holes |
| working temperature | -20ºC~+50ºC |
3. working principle:
The ultrasonic probe is lowered along the borehole filled with mud at a certain rate. During the continuous lowering process, the transmitting probe emits ultrasonic pulses vertically along the borehole wall, and the receiving probe receives the reflected information from the borehole wall. When the borehole wall is solid and firm (or the diameter is reduced), the two-way travel time of ultrasonic propagation is short and the reflection intensity is high; when the borehole wall is loose and collapsed (or the diameter is expanded), the two-way travel time of ultrasonic propagation is long, the reflection intensity is low, or even no reflected signal is received. By recording the reflection time and reflection intensity, the aperture value of the borehole at different depths can be calculated and the condition of the borehole wall can be reflected, and then the parameters such as the hole depth and verticality can be calculated. These data are automatically controlled by the winch to lower and raise the probe, and the reflected signal is transmitted from the receiving probe to the recorder on the ground, and is printed into a map through calculation, providing detailed information on the quality of the borehole wall for the project.
4. Application case
A pumped storage ultrasonic hole wall imaging detection site
The whole hole cracks are well developed and relatively broken
Comparison of ultrasonic imaging and optical imaging of pumped storage boreholes
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