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Acoustic Televiewer
The Acoustic Borehole Televiewer provides
continuous logs of oriented, unwrapped images of borehole walls.
Further processing allows for the computation and display of standard
information on fractures and other geological features.
Unlike the Optical Televiewer, the Acoustic Televiewer can be run in
both clear and opaque mud.
Unlike the Acoustic Televiewer, the Optical Televiewer can be run in
both air filled and (clear) water filled holes. The
sonde can be supplied with only a data modem and acquisition software
if no other Geovista sondes are required at the time.
Specifications:
Dimensions & Weight:
Length: 2.10 m ;
Diameter: 42 mm; Weight: 10 kg
Acoustical Subsystem:
Frequency: 1.5 MHz
Beam angle: 3º conical
Rotation speed: up to 20 rev/sec
Sampling density : 90, 120, 180 or 360 per revolution
Acquisition sampling rate: 100 nS
Gain: 0 to 60 dB in 1 dB steps or Automatic Gain Control (AGC)
Acquisition resolution: 8 bits
Deviation Subsystem:
3-axis magnetometer - Azimuth accuracy:
±2.5º
3-axis accelerometer - Inclination accuracy:
±0.4º
Log Parameters:
360° oriented Travel Time Image ( 12-bit resolution / 100 ns
per bit )
360° oriented Amplitude Image
Borehole azimuth and dip
Operating Conditions: Fluid filled
boreholes; Max. Pressure 20MPa; Max. Temp. 90ºC
Borehole Diameter Range: 50 to over 400 mm , depending on
borehole fluid condition
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