UK T. (+44) 1492 582 323

Americas T. +1 (559) 456-1711

Asia T. (+852) 6503 3486

Dual Laterolog

The RG dual laterolog provides deep and medium penetrating resistivity measurements using a classic laterolog-9 electrode configuration. It is the preferred alternative to the array induction probe in saline drilling muds.

Principle of measurement:

An alternating current from a centre electrode A0 passes through the formation and returns to a surface fish (deep resistivity) or to electrodes A2 and A2’ on the probe (shallow resistivity). A bucking current flowing from the guard- electrode pair A1 and A1’ is controlled to maintain the monitor electrode pairs M1M2 and M1’M2’ at the same potential. These equipotential surfaces constrain the measure current path to a disc of thickness 2ft.


  • Down-hole digital control of current sequence for deep and shallow measurements
  • Focused measurement gives high vertical resolution
  • Constant power drive for wide dynamic range
  • Voltage reference and SP measurement from electrode on rigid bridle
  • Stackable with RG slim oilfield tool range


  • Deep focused resistivity (LLD)
  • Shallow focused resistivity (LLS)
  • Groningen
  • SP


  • Invasion profile
  • Fluid
  • Saturation
  • Permeability indication


Diameter: 63mm (2.5”)
Total length: 9.04m (357”) (in 3 sections)
Max section length: 3.37m (133”)
Weight: 102kg (225lb)
Max. temperature: 125°C
Max. pressure: 86MPa (12,500psi)
Range: 0.1 to 40,000ohm-m
Accuracy: 5% at 1000ohm-m
Resolution: 1% measured value

Operating Conditions

Borehole type: Open-hole, mud filled 4” – 12”

Sales Information

I0013886 Dual laterolog probe
I0015009 Solid bridle with reference electrode
I0013888 Field test box with leads and clamps
I0015341 Centraliser (2 required)

Download Dual Laterolog sheet


...Practical Innovation with Global Service & Support...

Robertson Geologging Ltd., 2017

how can we help you?

(+44) 1492 582 323