Casing defect determination using eddy current techniques
First Claim
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1. A system for characterizing a casing, comprising:
- an excitation source of a casing evaluation tool, wherein the excitation source comprises one or more transmitter electromagnetic coils configured to;
generate and direct a plurality of excitation signals toward a plurality of casings in a wellbore;
a receiver of the casing evaluation tool, wherein the receiver comprises one or more receiver electromagnetic coils configured to;
receive a plurality of response signals based on the plurality of excitation signals; and
one or more processors configured to;
receive the plurality of received response signals;
determine a small defect information for each of the plurality of received response signals based on a time-domain response associated with each of the plurality of received response signals; and
determine one or more characteristics of a first defect in the plurality of casings by summing the small defect information for each of the plurality of received response signals, wherein the determining the one or more characteristics comprises using a forward model.
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Abstract
A system comprises one or more electromagnetic coils configured to generate and direct excitation signals toward a plurality of casings in a wellbore and receive response signals based on the excitation signals. The system further comprises one or more processors configured to receive a first response signal from the one or more electromagnetic coils and determine one or more characteristics of a first defect in the plurality of casings using the first response signal and small defect information.
10 Citations
21 Claims
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1. A system for characterizing a casing, comprising:
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an excitation source of a casing evaluation tool, wherein the excitation source comprises one or more transmitter electromagnetic coils configured to; generate and direct a plurality of excitation signals toward a plurality of casings in a wellbore; a receiver of the casing evaluation tool, wherein the receiver comprises one or more receiver electromagnetic coils configured to; receive a plurality of response signals based on the plurality of excitation signals; and one or more processors configured to; receive the plurality of received response signals; determine a small defect information for each of the plurality of received response signals based on a time-domain response associated with each of the plurality of received response signals; and determine one or more characteristics of a first defect in the plurality of casings by summing the small defect information for each of the plurality of received response signals, wherein the determining the one or more characteristics comprises using a forward model. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for characterizing a casing, comprising:
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generating and directing a plurality of excitation signals toward a plurality of casings in a wellbore using one or more transmitter electromagnetic coils of a casing evaluation tool; receiving at one or more receivers of the casing evaluation tool a plurality of response signals from the one or more transmitter electromagnetic coils based on the plurality of excitation signals; determining a small defect information for each of the plurality of received response signals based on a time-domain response associated with each of the plurality of received response signals; and determining one or more characteristics of a first defect in the plurality of casings by summing small defect information for each of the plurality of received response signals, wherein the determining the one or more characteristics comprises using a forward model. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A non-transitory computer-readable medium comprising instructions for characterizing a casing, the instructions configured, when executed by a processor, to:
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receive a plurality of response signals from one or more receiver electromagnetic coils of a casing evaluation tool, wherein the plurality of response signals are based on a plurality of excitation signals generated by one or more transmitter electromagnetic coils of the casing evaluation tool and directed toward a plurality of casings in a wellbore; determine a small defect information for each of the plurality of received response signals based on a time-domain response associated with each of the plurality of received response signals; and determine one or more characteristics of a first defect in a plurality of casings by summing small defect information for each of the plurality of received response signals, wherein the determining the one or more characteristics comprises using a forward model. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification