A video on Neutron-Density interpretation tip

Ultrasonic Borehole Imager (UBI)

Other Common Names to this log:

1. CBIL (pronounced Cybill) stands for Continuous Borehole Image Log 

2. Borehole televiewer

COMPARISON WITH OTHER IMAGE LOGS:


Acoustic image logs, also called televiewer or CBIL logs, use a rotating transducer to measure acoustic impedance images over the entire borehole wall, as well as an acoustic caliper.
Resistivity imager logs, also called microscanner or FMS or FMI logs, carry an array of electrodes on pads used to produce an electrical image of the formations seen on the borehole wall.  Microscanners have better vertical resolution and dynamic range than televiewers, but televiewers see the entire wellbore while microscanners usually see less than 100%.

How to QC FMI data?

1. Check the calliper curves and see if the hole shape is
good and has no washouts.

2. Check the FMI images. 
Are they readable? 
Did all the pads work well?

3. Finally, it is good to check the deviation data of the well
and compare it with the deviation curve presented with the
FMI data.