Patent ID: 11905816
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Measurement (Instruments)
Classification: CPC E  G | IPC E  G

Claim 14:
15. A machine-readable medium storing instructions for processing pulse-echo waveforms measured in a borehole casing to determine a thickness of the borehole casing, the instructions, when executed by one or more processors, cause the one or more processors to
extract, from the measured pulse-echo waveform, a reflection portion corresponding to a reflection off an interface between the borehole casing and a borehole fluid contained within the borehole casing;
compute, for each of a plurality of casing thicknesses, a synthetic frequency spectrum as a weighted sum of plane-wave echo waveforms simulated for the respective casing thickness across a range of frequencies, using the reflection portion extracted from the measured pulse-echo waveform as a driving pulse to weight the simulated plane-wave echo waveforms;
correlate a frequency spectrum of the measured pulse-echo waveform with the synthetic frequency spectra computed for the plurality of casing thicknesses to obtain a correlation coefficient as a function of casing thickness; and
determine a thickness of the borehole casing based on a maximum of the correlation coefficient.