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FWVS-LU (Logging tool)

Model id: Robertson Geologging Full-Waveform Sonic Probe with CBL


  • full waveform data (sonic probe)
  • seismic velocity, p wave

Purpose: sonic velocity of the rock, full waveforms from each of the two receivers, after processing Vp and maybe Vs

Description: The sonic probe uses a dual-transmitter dual-receiver array to provide high-quality formation acoustic-velocity data. Options are available for display of full-waveform data and cement-bond data (CBL) in cased boreholes. A piezoelectric transmitter is stimulated by a high-voltage pulse and radiates a high-frequency sonic wave via the borehole fluid and formation to a receiver. An accurate quartz clock measures the first arrival transit time. Compensated sonic mode: Both pairs of transmitters and receivers are used. The probe measures the velocity of the first compressional arrival. Use of multiple transmitters and receivers allows cancellation of the borehole fluid path and determination of formation velocity. Full waveform sonic mode: Only the lower transmitter is used. The probe records the full sonic wave-train at both receivers simultaneously and also the velocity of the first arrival. Cement-bond log (CBL) mode: Only the lower transmitter is used. The probe records the amplitude andarrival time of the first casing arrival at the lower receiver and full wave-trains at both receivers.

Characteristics: Formation velocity (slowness; Shear (S) velocity (where shear wave exists); Full waveform; Time of first arrival (delta-t); Amplitude of first arrival (CBL); Integrated transit time


Typical logging speed:4.00 m/min
Maximum pressure:20.0 MPa
Maximum temperature:70℃
Required boreholefluid:
liquidThe borehole has to be filled with some sort of liquid.
Minimum borehole diameter:0.090 m
Maximum borehole diameter:0.472 m
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:4.35 m
Maximum diameter:0.060 m
Weight:24 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