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QL40-ELOG – Electrical Resistivity

ELOG Resistivity Example Data


The QL40-ELOG digital probe measures 8, 16, 32 and 64 inch normal resistivity, single point resistance (SPR) and spontaneous potential (SP) simultaneously. Users can log resistivity profiles with different depths of investigation and gain information about permeability, porosity, water quality and geological formation properties.

Four resistivity measurements are recorded compared to two offered by most other manufacturers. The QL40-ELOG is an inline sub. It can be combined with other logging tools of the QL (Quick Link) product line or operated as a standalone tool.

It is possible to extend the application of the QL40-ELOG to a QL40-IP Induced Polarization probe through a simple firmware upgrade. The QL40-IP configuration also allows recording of the chargeability of the formation.


Operating Conditions

Borehole Fluid
[X] Water
[X] Mud
[_] Dry

[X] Uncased
[_] PVC Borehole
[_] Steel

[_] Required
[X] Not Necessary

Features & Benefits

Specifications – Metric/English

Specification Metric Imperial
Diameter 43 mm 1.7″
Length 1.9 m 74.8″
Weight 9 Kg 19.8 lbs.
Max. Temp. 70ºC 158ºF
Max. Pressure 200 bar 2900 psi


Sensor: Stainless steel electrode
Resistivity Range: 0.1 to 100,000 Ohm-m
Resistivity Accuracy: 1% Full Scale
SPR Range: 0.1 to 100,000 Ohm
SP Range: ± 18 V
SP Accuracy: ± 2.5 mV
SP Resolution: 0.5 mV

QL Stack Possibilities


QL40-ELOG Resistivity Probe Brochure
User Guide

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