The dual induction probe provides conductivity logs with deep and medium depths of investigation. The tool uses an ‘array’ technique where multiple sets of in-phase and out-of- phase receiver responses are processed and summed to emulate the vertical and radial responses of classic 6FF40 ILD and ILM logs.
The tool may be combined with other measurements and is always run at the base of the stack. The probe includes a fast-response platinum resistance thermometer for measurement of external borehole temperature.
An oscillating high-frequency magnetic field created by a transmitter coil within the probe induces an alternating electrical current within the surrounding conductive formation. This current, in turn, induces voltages within multiple receiver coils in the probe proportional to formation conductivity. The transmitter-receiver spacings determine the depth of investigation of the measurements.
|Max. pressure:||86MPa (12,500psi)|
|Resistivity range:||0 to 200ohm-m
(Qualitative indication up to 2000ohm-m)
|Depth of investigation:||ILD 60”
Borehole type: 4” to 12” mud or air-filled open hole
|I003947||Dual induction probe with temperature|
|I004134||Fin stand-off (set of two)|
...Practical Innovation with Global Service & Support...
Robertson Geologging Ltd., 2017
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