The Super Petrophysics Blog

Simple shortcuts to day-to-day petrophysics.

How to evaluate cement behind casing (CBL) and corrosion logs - The complete guide to well integrity logs

This post provides overview of the cement bond logs and the corrosion logs. When we complete a well, we put the well on production. We need to be sure that the completed well is safe for production. Different fluids at varying temperatures, scales, corrosive fluids, sands erosions and many...


[Part 1/2]: How to measure fluid saturation behind casing - Enter the Sigma mode.

What do you do when you want to measure water saturation behind casing? What if you want to know the current water saturation after years of production? The answer: You run a sigma log or a C/O log using a Pulsed Neutron Log Tool (PNL). The PNL tool you use to run these two logs goes by many...