CEMENT EVALUATION LOGGING

An illustrative embodiment of the present invention includes methods and apparatus for acoustically logging a cased well borehole to evaluate the condition of cement disposed in the annulus between the casing and the borehole walls. The attenuation constants associated with the radial modes or reson...

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Bibliographische Detailangaben
Hauptverfasser:	MORAN J,US, BAKAMJIAN B,US, MURICCHIO T,US
Format:	Patent
Sprache:	eng
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:	An illustrative embodiment of the present invention includes methods and apparatus for acoustically logging a cased well borehole to evaluate the condition of cement disposed in the annulus between the casing and the borehole walls. The attenuation constants associated with the radial modes or resonances of the borehole-casing-annulus formation system are determined by periodically exciting the system with acoustic impulses and measuring in a plurality of relatively narrow frequency bands associated with the resonance frequencies or modes, the amplitudes of the reflected sonic waves at two distinct points in time. The attenuation constants so measured may then be used in apparatus designed to calculate cement effectiveness by determining the cement thickness and width of annulus between the casing and the cement.