Systems and methods for analyzing casing bonding in a well using ultrasound velocity filtering
AssigneesConocoPhillips Company, Pipelines 2 Data (P2D) Limited
InventorsGeoff Steel, Mark Walsh, Stephen John Mayo
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Abstract
Implementations described and claimed herein provide systems and methods for isolation detection. In one implementation, an axial acoustic signal is obtained. The axial acoustic signal is captured using an axial sensor deployed in a structure in a subterranean surface. The axial acoustic signal is separated into a first wave region and a second wave region by applying velocity filtering. An axial symmetry of a portion of the structure is determined based on at least one of the first wave region or the second wave region.
Claims20
A method for isolation detection in a wellbore, the method comprising:
- obtaining an axial acoustic signal, the axial acoustic signal captured using an axial sensor deployed in a structure in a subterranean surface;
- determining one or more velocities of one or more waveforms included in the axial acoustic signal;
- separating the axial acoustic signal into a first wave region and a second wave region by applying velocity filtering to the one or more velocities;
- generating an axial log indicating an axial symmetry of a portion of the structure based on at least one of the first wave region or the second wave region;
- generating a radial log indicating a radial symmetry of the portion of the structure based on a radial acoustic signal;
- and
- combining the axial log and the radial log to generate an isolation characterization for the portion of the structure.
A method for isolation detection in a wellbore, the method comprising:
- obtaining an axial acoustic signal, the axial acoustic signal captured using an axial sensor deployed in a structure in a subterranean surface;
- determining a first velocity of a first waveform included in the axial acoustic signal, and a second velocity of a second waveform included in the axial acoustic signal;
- separating the axial acoustic signal into a first wave region and a second wave region by applying velocity filtering to the first velocity and the second velocity;
- determining an axial symmetry of a portion of the structure based on at least one of the first wave region or the second wave region;
- determining a radial symmetry of the portion of the structure based on at least a radial acoustic signal;
- and
- generating an isolation characterization for the portion of the structure based on both the axial symmetry and the radial symmetry.
One or more tangible non-transitory computer-readable storage media storing computer-executable instructions for performing a computer process on a computing system, the computer process comprising:
- obtaining an axial acoustic signal using an axial sensor deployed in a structure in a subterranean surface;
- obtaining a radial acoustic signal using a radial sensor deployed in the structure;
- determining one or more velocities of one or more waveforms included in the axial acoustic signal;
- separating the axial acoustic signal into a first wave region and a second wave region by applying velocity filtering to the one or more velocities;
- and
- generating an axial log indicating an axial symmetry of a portion of the structure based on at least one of the first wave region or the second wave region;
- generating a radial log indicating a radial symmetry of the portion of the structure based at least partly on the radial acoustic signal;
- determining if the portion of the structure is axially or radially homogenous by combining the axial log with the radial log.
Dependencies are inferred from the claim text.