| 摘要 |
PROBLEM TO BE SOLVED: To provide means to acoustically inspect a casing and cement bonds that provides high resolution yet still operates in high density fluids.SOLUTION: Among other things, there are disclosed embodiments of a well-logging tool that inspects features of the down-hole environment using ultrasonic signals with a frequency in the range of 3-5 MHz. The ultrasonic signals are encoded, and their time-of-flight and amplitude provide information on features of the interior surface of the casing on the order of 1 mm, and on the quality of the cement bond behind the casing.SELECTED DRAWING: Figure 1 |
