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Verticality Probe

The RG verticality probe provides accurate, continuous measurements of borehole inclination and direction. These are output directly as log traces or may be processed further to produce tabular and graphical outputs of borehole position, borehole drift and true vertical depth.

Principles of Measurement

The probe includes a triaxial magnetometer to deduce the probe bearing relative to magnetic North and three accelerometers to measure inclination. The outputs from the transducers are processed by a downhole microprocessor to give final borehole inclination and azimuth data in real time. The operation of the probe is limited in steel casing or in the presence of magnetic minerals which affect the magnetometer. Under such conditions, only borehole inclination (without directional information) can be logged. The gyroscopic verticality probe should be used in preference to the standard verticality probe in these cases.


  • Small diameter for slimhole operations
  • Continuous borehole orientation log
  • Suitable for all borehole inclinations and directions
  • Optional natural-gamma measurement


  • Borehole inclination
  • Borehole direction
  • Borehole drift
  • True vertical depth



Lithology, Bulk density variations, Correlation with other logs, Bed thickness and boundary location, Borehole inclination and true vertical depth.


Optional 110/220VAC power supply (also powers SMART portable winch). Detection of weathered or fractured zones, Ground compaction studies.


Location of aquifer and aquitard, Detection of cavities and missing cement around casing.

Operating Conditions

Borehole type: All