G - Physics – 01 – V
Patent
G - Physics
01
V
349/4, 349/41
G01V 1/40 (2006.01) E21B 47/00 (2006.01) E21B 47/08 (2006.01) G01B 17/02 (2006.01) G01N 29/11 (2006.01) G01N 29/265 (2006.01) G01V 1/44 (2006.01) G01V 1/50 (2006.01) G01V 1/52 (2006.01)
Patent
CA 1129066
ABSTRACT Methods and apparatuses for acoustically investigating a casing in a borehole to derive the quality of a cement bond behind the casing and casing thickness are described. The techniques employ an acoustic pulse source having a frequency spectrum selected to stimulate selected radial segment of the casing into a thickness resource. The selected frequency spectrum enhances the reverberations between the inner and outer with significant amplitudes for a duration depending upon the amount of acoustic energy leaked into adjacent media. The acoustic pulse causes acoustic returns which are formed by the reflections from interfaces between media of different acoustic impendence and acoustic energy leaked into the bore of the casing from the acoustic thickness reverberations stimulated within the casing walls. The acoustic returns are detected to generate a reflection signal which is processed to determine casing thickness or to evaluate the cement bond. The acoustic pulse has a frequency spectrum which is particu- larly effective in discriminating different cement bond condi- tions caused by small cement separations known as micro-annuli, around the casing. Several signal processing techniques and tools are described to provide accurate and high resolution cement bond evaluation and casing thickness determination by processing a portion of the reflection signal representative of the thickness reverberations.
307071
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
Method and apparatus for acoustically investigating a casing... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for acoustically investigating a casing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for acoustically investigating a casing... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-979041