NDLI: Quantitative corrosion evaluation in wells using a multi-function ultrasonic imager

Content Provider	IEEE Xplore Digital Library
Author	Hayman, A.J. Parent, P. Rouault, G. Zurquiyah, S. Verges, P. Liang, K.K. Stanke, F.E. Herve, P.
Copyright Year	1995
Description	Author affiliation: Schlumberger-Riboud Product Centre, Clamart, France (Hayman, A.J.; Parent, P.; Rouault, G.; Zurquiyah, S.; Verges, P.)
Abstract	A multi-function ultrasonic imaging tool has been developed for well inspection. The tool is suspended at the end of a long armoured cable and operates by rotating a pulse-echo transducer in the well fluid. It was initially applied to cement evaluation with simultaneous casing inspection, using a resonance method (200-700 kHz). Subsequently, a focused 250/500 kHz transducer was provided for openhole imaging and detailed internal casing inspection. The latest functional addition to the instrument is a focused 2 MHz transducer with a spot size of 0.11", developed for high resolution internal and external corrosion imaging. The aim is to quantify small-scale defects such as pitting. The casing radius and thickness are measured from the arrival times of the internal and external casing echoes, using downhole digital processing. The casing is examined every 2/spl deg/ in azimuth and every 0.2" vertically in a helical scan as the armoured cable is reeled in. Laboratory experiments verified quantification of 0.16" diameter flat-bottom holes. Field test results demonstrated the detection of small-scale internal and external corrosion and damage.
Starting Page	1115
Ending Page	1120
File Size	376034
Page Count	6
File Format	PDF
ISBN	0780329406
ISSN	10510117
DOI	10.1109/ULTSYM.1995.495756
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-11-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Corrosion Inspection Focusing High-resolution imaging Ultrasonic imaging Ultrasonic transducers Resonance Instruments Image resolution Thickness measurement
Content Type	Text
Resource Type	Article

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