The RG full-waveform sonic provides multi-spacing digital acoustic-velocity (formation-slowness) measurements with high vertical resolution. Full-waveform recording and CBL measurements are also available.
The tool can be stacked with other tools in the RG oilfield range.
A piezoelectric transmitter stimulated by a high-voltage pulse radiates a high frequency acoustic wave through the borehole fluid and formation to the receiver array. An accurate quartz clock measures the first-arrival transit time at each receiver.
Two receivers and two transmitters are used. The probe measures the time of the first compressional arrival at each receiver from each transmitter firing. The data is depth-shifted and processed to remove the influence of the borehole fluid path, tool tilt and caving (depth-derived borehole compensation).
The probe records the 3’ first arrival amplitude and 5’ full sonic wave train. The attenuation of the first arrival is related to the bond quality and the strength of cement.
|IO13889||Full-waveform sonic probe|
|I014803||6-arm centraliser (2 required)|
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Robertson Geologging Ltd., 2017
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