Using amplitude ratio curves to evaluate cement sheath bonding in multi-string downhole environments
AssigneeHalliburton Energy Services, Inc.
InventorsGary James Frisch, Philip Edmund Fox
Life of this patent
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Abstract
A method for evaluating a cement sheath in a wellbore, in some embodiments, comprises transmitting sonic or ultrasonic waves from a logging tool disposed in a wellbore, receiving reflected waves at the logging tool and recording waveforms based on the received waves, processing the waveforms to determine average absolute value amplitude data for each of a plurality of zones, and determining a number using average absolute value amplitude data for a first of the plurality of zones and average absolute value amplitude data for a second of the plurality of zones.
Claims20
A method for evaluating a cement sheath in a wellbore, comprising:
- transmitting sonic or ultrasonic waves from a logging tool disposed in a wellbore;
- receiving reflected waves at the logging tool and recording waveforms based on the received waves;
- processing the waveforms to determine average absolute value amplitude data for each of a plurality of zones;
- and
- determining a number using average absolute value amplitude data for a first of the plurality of zones and average absolute value amplitude data for a second of the plurality of zones.
A method for evaluating a cement sheath in a multi-string wellbore, comprising:
- lowering a logging tool into a wellbore;
- transmitting sonic or ultrasonic signals from the tool;
- receiving reflected signals and recording one or more of said signals as a waveform;
- determining a set of absolute value amplitudes of the waveform at minima and maxima of said waveform;
- dividing said set of absolute value amplitudes into a plurality of zones;
- determining a mean absolute value amplitude for each of the plurality of zones;
- and
- calculating a number using mean values corresponding to different ones of said zones.
A system for evaluating cement bonding in a wellbore, comprising:
- a logging tool that transmits sonic or ultrasonic waves, receives reflected waves, and records waveforms based on the received waves;
- and
- processing logic coupled to the tool that determines a set of mean absolute value amplitudes of a waveform at minima and maxima of said waveform, said mean values divided into different zones,
- wherein the processing logic determines a number using mean values from multiple of said different zones.
Dependencies are inferred from the claim text.