Impeller Flowmeter Tool

The Impeller Flowmeter Tool is a reliable instrument designed to measure vertical fluid velocity within a borehole, enabling the identification of inflow and outflow zones. Typically operated at a constant logging speed both up and down the borehole, this tool provides accurate data for hydrogeological and environmental assessments.

After data collection, measurements are corrected for logging speed to produce a Fluid Velocity (FV) log. By combining FV data with caliper measurements (borehole diameter), the tool can calculate flow rates (Q) in litres per second, providing valuable insights into subsurface water movement.

  • Fluid Velocity Measurement: Precisely measures vertical fluid movement within boreholes.
  • Flow Rate Calculation: Derives flow rates (Q) using fluid velocity and borehole diameter data.
  • Inflow and Outflow Identification: Locates key zones of water movement for detailed analysis.
  • Dimensions: 700mm (length) x 38mm (diameter)
  • Weight: 5kg
  • Velocity Range: 10mm/s and above
  • Maximum Temperature: 80°C
  • Maximum Pressure: 20MPa


  • Minimum Diameter: 60mm
  • Environment: Water-filled boreholes
  • Lining: Suitable for unlined, steel, or plastic-screened boreholes

The Impeller Flowmeter Tool is an essential solution for assessing fluid velocity and flow dynamics within boreholes. Its precise measurements and ability to identify water movement make it indispensable for groundwater studies, aquifer evaluations, and environmental monitoring.