Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1988-11-17
1990-01-23
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
364422, 367 30, 367 31, G01V 140
Patent
active
048963038
ABSTRACT:
Acoustical coupling is proposed as a means of determining the presence and acoustical impedance of materials behind casing in cementation evaluation. Expressions for computing coupling and attenuation in multi-receiver/transmitter logging systems are analyzed in an exponential model for the spatial decay of elastic wave energy propagating axially along the casing. Amplitude change between transmitter(s) and receiver(s) is separated into a change dependent on coupling into and out of the casing wave, as well as a change related to attenuation along the casing. Coupling which is dependent on geometrical factors such as casing size and thickness, and on distribution and mechanical properties of the material outside the casing, shows principally the mechanical impedance of the material outside. Significantly, the bonding of this material to the casing is not a dominant factor for the coupling. Thus an estimation of cement strength may be made even in the presence of microannulus.
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Communication no 42, "Fracture Detection Using the Sonic Tool", by; Philippe S. Y. Cheung.
SPE 13044 "The Fluid-Compensated Cement Bond Log", by: T. H. Nayfeh, W. B. Wheelis, Jr., and H. D. Leslie.
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SPE 16207 "Coupling and Attenuation: A New Measurement Pair in Cement Bond Logging", by: H. D. Leslie, J. de Selliers, and D. J. Pittman.
de Selliers de Moranville Jacques A. E.
Leslie David
Pittman Dennis J.
Bouchard John H.
Garrana Henry N.
Moskowitz Nelson
Schlumberger Technology Corporation
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