RobertsonGeo - 3-Arm Caliper
Well Logging System
    Model: 3-Arm Caliper
    Country of Origiin: UK
    Use: The 3-Arm Caliper probe provides a single continuous log of borehole diameter as recorded by three mechanically coupled arms in contact with the borehole wall.
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710mm, 1000mm and 1500mm range calipers are available to suit a range of well diameters. The caliper is a useful first log to determine the borehole conditions before running more costly probes or those containing radioactive sources.

Principle of Measurement:

Opening and closing of the motor-drivercaliper arms is by surface command, allowing the probe to run into the borehole with the arms retracted. Once opened, the spring-loaded arms respond to borehole diameter variations as the probe is raised up the borehole.


SPECIFICATION:

Features
  • Small diameter for slim-hole operation
  • Extension arms supplied as standard for 38mm version
  • Optional natural-gamma measurement
  • Optional casing collar locator

Measurements
  • CCL (optional)
  • Borehole volume (derived)
  • Natural Gamma (optional)
  • Borehole volume

Applications
  • Minerals/Water/Engineering
  • Location of borehole collapse or obstructions
  • Cement volume calculations for grouting Identification of hard and soft lithology
  • Location of cracks, fissures, caving, faulting, casing breaks
  • Correction of other logs affected by borehole diameter

Operating Conditions
  • Borehole type: open/cased; water/air-filled
  • Centralisation: recommended in large holes
  • Centralisation: recommended in inclined holes
  • Recommended Logging Speed: 5m/min

Specifications
  • Temperature: 0-70⁰C (extended ranges available)
  • Max. pressure: 20MPa
3-Arm Caliper (710mm range) 
  • Diameter: 38mm 
  • Length: 2.18m-2.68m (depending on CCL and extended arms) 
  • Weight: 7.5kg 
  • Range: 40-300mm and 40-710mm 
3-Arm Caliper (1000mm range)
  • Diameter: 60mm
  • Length: 2.83m
  • Weight: 15kg
  • Range: 65-1000mm
3-Arm Caliper (1500mm range)
  • Diameter: 80mm
  • Length: 3.14m
  • Weight: 17.5kg
  • Range: 100 - 1600mm
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