Dual Induction Probe


The dual focussed induction probe provides two simultaneous conductivity logs, corresponding to “medium” and “deep” radii of investigation intothe formation. The two depths of penetration are useful in porous, permeable formations where displacement of formation fluids by drilling mud creates an “invasion zone” with different electrical properties. High stability and exceptionally wide dynamic range allow the user to carry out precise measurements of conductivity in formations with sand-clay layers and mineralised water-soaked sands. The probe can be used in water filled, dry and plastic cased boreholes.

The QL40-IND sub can be combined with other logging tools of the QL (Quick Link) product line or can be operated as a standalone tool. It is compatible with Matrix, Scout and ALTlogger acquisition systems.


Dual coil system with intercoil spacing : 50 & 80 cm
Operating Frequency : 100 kHz

Temperature – Pressure

0-70°C (32-158°F)
200 bar (2900 psi)

Diameter – Length

45 mm (1.77”)
1.925 m (75.78”)


7 kg (15.4 lbs)


Medium Induction : mS/m

Deep Induction : mS/m


Manufactured by Geotomographie GmbH

Technical Details

Generated wave types: SV
Signal frequencies: Up to 500 Hz (depending on geology and borehole distance)
Operational depth: Up to 100 m
Source length: 1015 mm
Source weight: 6 kg
Cable weight per metre: 377 g
Borehole diameter: 75-100 mm (or larger if spacers are used)
Clamping system: Infatable bladder
Depth indicator: Cable marking every 2 m
Connector: To impulse generator IPG800 or IPG5000
Storage: On drum
Switch box: Switch between two vertical shot directions

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