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Acoustic logging for examination of the cement bonding of well casing

Patent ·
OSTI ID:6777414
An acoustic source and a spaced-apart acoustic receiver are moved through the casing of a well. Electrical signals indicative of the source signal and the receiver signal are applied uphole by way of a conductor to a time series analyzer and recorder. The time series analyzer provides power-spectral density functions and cross-spectral density functions of the source and receiver signals during reconnaissance logging operations. From these functions there is determined the ability of the casing-cement formation combination to transmit the source signal to the receiver and also the linear correlation of the source signal and receiver signal.
Assignee:
Mobil Corp
Patent Number(s):
US 4217659
OSTI ID:
6777414
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
ACOUSTIC MEASUREMENTS
EQUIPMENT
MEASURING METHODS
NATURAL GAS WELLS
OIL WELLS
SIGNALS
SONIC LOGGING
WELL CASINGS
WELL COMPLETION
WELL LOGGING
WELL LOGGING EQUIPMENT
WELLS