Cement Evaluation - Cement Bond Logs (CBL)
This article describes how Cement Bond Logs are used to interpret the quality of the cement bond. The Cement Bond Logs (CBL) gives a continuous measurement of the amplitude of the first casing arrival at a receiver spaced 3 ft from an acoustic transmitter. The amplitude is a maximum in unsupported pipe, and a minimum for well cemented casing.
The absolute reading is a function of casing size and thickness, cement bond quality, wellbore fluid, tool type and tool centering. Generally, most of these parameters will be constant so that . . .