BDV42 / BDV42G

The BDV42 probe is used to determine the exact drilled trajectory of a borehole in the subterranean space. Boreholes drilled close to infrastructure such as cables or tunnels can be surveyed before reaching the critical point. Another application of this method lies in water well quality control by ensuring that well deviation and curvature criteria are met so that problems with lowering pumps and other equipment can be avoided.

The probe is based on a high-precision combination magnetometer and accelerometer sensor providing a continuous measurement of borehole inclination and azimuth. Because of the resulting magnetic disturbance, reliable azimuth data can not be obtained in steel-cased wells or in iron-rich geological formations.

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BDV42 probes specifications

  • Diameter : 42.2 mm
  • Weight : 7 Kg
  • Weight (with ballasts weights) : 11 Kg
  • Length : 1800 mm
  • Length (with ballasts weights) : 2070 mm
  • Max. Temp / Pressure : 70°C / 200 bar

  • Measurement resolution : Azimuth : ± 0.1° & Inclination : ± 0.1°
  • Measurement accuracy : Azimuth : ± 0.5° & Inclination : ± 0.2°

  • Gamma-ray sensor : ø25 x 50 mm NaI(Tl) crystal
  • Non-magnetic centralisers

  • Dry or fluid-filled borehole
  • Open hole or PVC casing, if azimuth required
  • Steel casing, if azimuth not required

BDVV42 Probe gallery

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