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QL40-OBI-2G – Optical Televiewer

Optical Televiewer probe

The New 2nd Generation Optical Televiewer is Here!



The QL40-OBI-2G and OBI40GR-2G are the new generation of Optical Borehole Imagers. The new televiewer comprises a completely redesigned optical assembly with new electronics. It implements a high resolution CMOS digital image sensor combined with a fisheye lens. The tool produces an extraordinarily clear, sharp, 360°  continuous- upwrapped digital picture of the borehole wall, either in air or clear water. Resolutions up to 1800 pixels over the borehole circumference can be achieved, which makes this televiewer ideal for lithological, mineralogical, and structural analyses.

A built in high precision orientation package incorporating a 3-axis magnetometer and 3-axis accelerometer allows orientation of the images to a global reference and determination of the borehole’s azimuth and inclination. Optical televiewer images can complement and even replace a coring survey and its associated problems of core recovery and orientation.

The new QL40-OBI-2G televiewer is fully digital and can operate on standard wirelines. It can be either combined with other logging tools of the QL (QuickLink) product line to build tool strings or operated as a standalone tool.

The OBI40GR-2G is a standalone tool version integrating a natural gamma sensor thereby enabling the measurement of gamma radiation emitted naturally from within the formations crossed by a borehole.

For more detailed information on the differences between the 1st and 2nd generation optical televiewers, please see the Release Note.


OBI40 Optical Lighthead Assembly

OBI Images in Different Geologic Environments

Operating Conditions

Borehole Fluid
[X] Water (Clear)
[_] Mud
[X] Dry

[X] Open Hole
[X] PVC Borehole
[X] Steel

[X] Required
[_] Not Necessary

Features & Benefits

Specifications – Metric/English

Specification Metric Imperial
Diameter 40 mm 1.57″
Length 1.47 m 57.9″
Weight 5.3 Kg 11.7 lbs.
Max. Temp. 70ºC 158ºF
Max. Pressure 200 bar 2900 psi

Optical Sensor: 1/3″ high sensitivity CMOS digital image sensor
Azimuthal Resolution: 120, 180, 360, 600, 900, 1800 pixels
Vertical Resolution: User definable minimum 1 mm. Function of depth encoder resolution.
Color Resolution: 24 bits RGB true colors
Responsivity: 5.48 V/lux-sec

Light Source: High efficiency LEDs
Color Temperature: 5600 K
Light Intensity: 750 lm
Color Rendering Index: 80%
Power Max.: 5.60 W

Orientation Sensor: APS 544 – 3-Axis Magnetometer and Accelerometer
Inclination Accuracy: ± 0.5 º
Azimuth Accuracy: ± 1.2 º

QL Televiewer Stack Possibilities

WellCAD Image & Structure Interpretation (ISI) Workspace

WellCAD® Software is an advanced log processing and visualization software recommended for use with all Mount Sopris and ALT logging probes. The WellCAD Image & Structure Interpretation (ISI) Workspace, used in conjunction with the QL40-OBI-2G optical televiewer provides:

For more information, please refer to the WellCAD ISI Workspace news post.


QL40-OBI-2G Brochure

Release Note for the Second Generation OBI

WellCAD Image & Structure Interpretation Workspace
Please Contact Us for the User Guide

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