Multimodal processing of pulsed eddy current response signal for well integrity evaluation

A method for eddy current testing in a well, the method comprising:

• generating, via one or more transmitter coils in the well, an excitation current;
• measuring, via one or more receiver coils in the well, an eddy current response signal from a plurality of pipes in the well, wherein the eddy current response signal comprises a voltage response;
• determining, via one or more processors, a frequency-domain transfer function based on a ratio of the voltage response to the excitation current;
• generating, via the one or more processors, a time-domain waveform based on the frequency-domain transfer function;
• determining, via the one or more processors, a plurality of waveform lobes of the time-domain waveform, wherein each of the plurality of waveform lobes is associated with at least one of the plurality of pipes, and wherein each of the plurality of waveform lobes is associated with a different time interval of the time-domain waveform;
• and
• estimating, via the one or more processors, one or more parameters of at least one pipe of the plurality of pipes based on one or more waveform lobes, of the plurality of waveform lobes, associated with the at least one pipe.

A non-transitory computer readable medium comprising computer executable code for eddy current testing in a well, the computer executable code comprising:

• code for determining a frequency-domain transfer function based on a ratio of an eddy current voltage response signal to an excitation current;
• code for generating a time-domain waveform based on the frequency-domain transfer function;
• code for determining a plurality of waveform lobes of the time-domain waveform, wherein each of the plurality of waveform lobes is associated with at least one of a plurality of pipes, and wherein each of the plurality of waveform lobes is associated with a different time interval of the time-domain waveform;
• and
• code for estimating one or more parameters of at least one pipe of the plurality of pipes based on one or more waveform lobes, of the plurality of waveform lobes, associated with the at least one pipe.