Casing resonant radial flexural modes in cement bond evaluation

A method useful for evaluating the presence and/or the quality of the cement bond (44) of a downhole tubular (36). The method involves measuring radial resonance modes of the tubular (36), and comparing those measured values to the unbound tubular resonant values of a calibration ring. For a well bo...

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Bibliographische Detailangaben
Hauptverfasser:	Tang, Xiao Ming, Barolak, Joseph G, Bolshakov, Alexei, Donskoy, Dimitri, Patterson, Douglas, Dubinsky, Vladimir
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	DETECTING MASSES OR OBJECTS EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS GEOPHYSICS GRAVITATIONAL MEASUREMENTS MEASURING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PHYSICS TESTING
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Beschreibung
Zusammenfassung:	A method useful for evaluating the presence and/or the quality of the cement bond (44) of a downhole tubular (36). The method involves measuring radial resonance modes of the tubular (36), and comparing those measured values to the unbound tubular resonant values of a calibration ring. For a well bonded tubular (36), the measured radial resonance should be greater than that of the unbound tubular calibration ring. In regions where a fluid, such as water surrounds the outside of the tubular (36), or the cement (44) is otherwise not bonded to the outer surface of the tubular (36), the measured response should be less than the calibrated response. The calibration ring should have the same diameter, wall thickness, and be made of the same material as the tubular (36).