Computing A0 mode attenuation for cement evaluation in cased wells
AssigneeHalliburton Energy Services, Inc.
InventorsAmit Padhi, Qingtao Sun, Chung Chang
Life of this patent
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Abstract
A method and system acoustic logging operations. The method may comprise selecting a transmitter to a casing offset for logging operations, wherein the transmitter is disposed on a logging tool, insonifying at least a part of a casing with the transmitter at an angle of incidence and collecting one or more waveforms with an array of receivers disposed on the logging tool. The method may further comprise identifying one or more wave mode travel times from the one or more waveforms, selecting one or more wavelets from the one or more waveforms, and identifying an attenuation of a lamb wave mode based at least in part on the one or more wave mode travel times and the one or more wavelets.
Claims18
A method comprising:
- selecting a transmitter to a casing offset for logging operations based at least in part on a logging fluid within the casing, wherein the transmitter is a collimated transducer that is disposed on a logging tool;
- insonifying at least a part of a casing with the transmitter at an angle of incidence;
- collecting one or more waveforms with an array of receivers disposed on the logging tool;
- identifying one or more wave mode travel times from the one or more waveforms;
- selecting one or more wavelets from the one or more waveforms;
- identifying an attenuation of a lamb wave mode based at least in part on the one or more wave mode travel times and the one or more wavelets;
- wherein the angle of incidence is selected based on the insonifying frequency;
- and
- wherein the insonifying frequency is chosen from a dispersion curve for the lamb wave mode.
A system comprising:
- a logging tool comprising:
- a transmitter for insonifying at least a part of a casing at an angle of incidence, wherein the transmitter is a collimated transducer;
- and
- an array of receivers for collecting one or more waveforms;
- and
- an information handling system configured to:
- determine a transmitter to a casing offset based on sensor data, input data, or both;
- identify one or more wave mode travel times from the one or more waveforms;
- select one or more wavelets from the one or more waveforms;
- identify an attenuation of a lamb wave mode based at least in part on the one or more wave mode travel times and the one or more wavelets;
- wherein the angle of incidence is selected based on the insonifying frequency;
- and
- wherein the insonifying frequency is chosen from a dispersion curve for the lamb wave made.
Dependencies are inferred from the claim text.