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. The tool is run below a soild insulated bridle that includes the SP, voltage-reference and Groningen measurement electrode. The lower 25m (82ft) of the logging wireline require insulation.
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.
FEATURES
Downhole digital control of current sequence for deep and shallow measurements.
Fully digital telemetry
Focused measurement gives high vertical resolution
Constant power drive for wide dynamic range
Voltage reference and SP measurement from electrode on insulated bridle
Stackable with RG slim oilfield tool range
MEASUREMENTS
Deep focused resistivity (LLD)
Shallow focused resistivity (LLS)
SP
Gronigen effect
APPLICATIONS
Invasion profile
Fluid Saturation
Permeability indication
OPERATING
CONDITIONS
Borehole type
Open-hole 4" to 12" diameter
SPECIFICATIONS
Diameter
63mm (2.5")
Length
8.96m (353") + 3.6m (142") solid bridle
Weight
102kg (224lbs)
Max. temperature
125ºC
Max. pressure
86MPa (12.500psi)
SALES
INFORMATION
Probe
IO13886
Dual focused laterolog
Accessories
IO15009
Solid bridle with SP electrode
IO14803
6-arm centraliser (2 required)
IO13888
Calibration box
IO15007
Source handling tool set Mud-pit electrode with 50m cable
