Peak Analysis of Multi-Directional Sonic an Ultasonoc Waveforms for Cement Bond Logging
AssigneeHallburton Energy Services, Inc.
InventorsGary James FRISCH, Philip Edmund FOX
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Abstract
A method for generating a cement bond log, in some embodiments, comprises transmitting sonic or ultra-sonic waves in multiple directions 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 numerical values that indicate a degree of bonding associated with multiple portions of a cement sheath disposed in the wellbore, aggregation the numericakl value, and generating a composite image based on the aggregated numerical values.
Claims23
A method for generating a cement bond log, comprising:
- transmitting sonic or ultrasonic waves in multiple directions from a logging tool disposed in a wellbore;
- receiving reflected waves at the logging tool and recording waveforms based on said received waves;
- processing the waveforms to determine numerical values that indicate a degree of bonding associated with multiple portions of a cement sheath disposed in said wellbore;
- aggregating the numerical values;
- and
- generating a composite image based on said aggregated numerical values.
A method for generating a cement bond log, comprising:
- lowering a multi-directional logging tool into a wellbore;
- transmitting multiple signals radially from the tool;
- receiving multiple reflected signals;
- for each of said received signals, determining a set of absolute value amplitudes of a corresponding waveform at minima and maxima of said waveform;
- for each set of absolute value amplitudes, determining a portion of the set that corresponds to an area associated with a cement sheath;
- determining a mean value of the absolute value amplitudes in each of said portions;
- and
- generating a composite image using the mean values determined for said portions.
A system for evaluating cement bonding in a wellbore, comprising:
- a multi-directional logging tool to transmit signals from the tool in multiple directions and to receive reflected signals;
- and
- processing logic coupled to the tool that determines, for each of the received signals, a set of absolute value amplitudes of a corresponding waveform at minima and maxima of said waveform,
- wherein a portion of each set of absolute value amplitudes corresponds to an area associated with a cement sheath in the wellbore, and
- wherein the processing logic determines a mean value of the absolute value amplitudes in each of said portions and generates a composite image using the mean values determined for said portions.
Dependencies are inferred from the claim text.