BHTV42

The BHTV 42 televiewer tool employs a rotating transducer mounted at the lower extremity of the tool to send a highly focalised ultrasonic pulse radially outwards towards the borehole wall up to 360 times per revolution, the amplitude and travel time of which are measured on its return to the tool after reflection at the borehole wall. This information, combined with the data given by the tool’s onboard orientation system, provides an extremely detailed and orientated acoustic image of the borehole wall.

The televiewer tool is used wherever orientated geological structure information is required.

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BHTV42 probe gallery

BHTV52 specifications

  • Diameter : 42 mm
  • Length : 2100 mm
  • Weight : 8 Kg
  • Housing : titanium and non magnetic brass
  • Max. Temp : 70°C
  • Pressure : 200 bar

  • Transducer type : 1 inch focussed piezocomposite sensor and rotating mirror
  • Signal frequency : 1.5 MHz
  • Acoustic beam angle : 3° (3dB) conical
  • Rotation speed : Up to 20 revolutions per second
  • Orientation : Triple magnetometers / accelerometers
  • Amplification : 0 to 60 dB, in 1 dB steps and AGC
  • Pulses per resolution : 90, 120, 180 or 360 (horizontal definition)
  • Vertical definition : Unlimited, determined by logging speed
  • Orientation accuracy : +/0.5° dipping ; +/1.0° azimuth

  • Gamma ray sensor: ø25 x 50 mm NaI(Tl) crystal
  • Centralisers non-magnetic
  • Verticality calibrator, bowspring centralisers, centraliser collar, weighter (load)

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