Slim Dual Laterolog Tool

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 guardelectrode 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.

Features

• 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

Measurements

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

Applications

• Invasion profile
• Fluid Saturation
• Permeability indication

Operating Conditions

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