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FLOW-LU (Logging tool)

Model id: Robertson Geologging Impeller Flowmeter with natural gamma


  • impeller rotation rate and time per revolution and other series that are necessary to evaluate an impeller flow meter measurement
  • pressure
  • temperature
  • total natural gamma

Purpose: fluid flow along along the borehole

Description: The probe is equipped with lightweight helical impellers mounted on double sapphire bearings for maximum sensitivity. The impellers contain magnets which actuate low-drag Hall-effect switches within the probe to detect impeller rotation. Separate log channels record the time of rotation according to fast and slow timebases for improved resolution at high and low flow rates. Uphole and downhole rotations are distinguished within the sonde. The impeller flowmeter gives a direct log measurement of cable speed to aid this procedure. Our probe has been fitted with temperature and pressure sensor.

Characteristics: Impeller Rotation Rate; Time per Impeller revolution; Cable Velocity; Natural Gamma; Temperature


Maximum pressure:20.0 MPa
Maximum temperature:70℃
Required boreholefluid:
liquidThe borehole has to be filled with some sort of liquid.
Centralisation required:yes
Type of datatransfer:
cableData are transferred in real time via a cable.
Required type of logging cable:
4 conductorA logging cable with 4 conductors.
Required cablehead:
GO4Connector according to GO 4 standard (4 conductors).
Implement search on winches with this cable head.
Type of signal:
digitalDigital signal transmission.
Acquisitionsystem (recommended):RG-LU
Length:1.57 m
Maximum diameter:0.070 m
Weight:7.3 kg
Belongs to toolstring:
standaloneA stand alone tool that cannot be integrated in a tool string.
Usage conditons:Commercial usage allowed/welcome.
Additional usage conditions:Logging as service by Lund University

Operator and contact:

Operator:Lund University, Engineering Geology
Contact person:Per-Gunnar Alm
Telephone:+46 462228992
Address: John Ericssons väg 1
223 63 Lund, Sweden

End of I-EDDA database record