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Time Reverse Nonlinear Elastic Wave Spectroscopy (TR-NEWS) has been used tofocus acoustic energy, and make measurements correlated with damage in avariety of industrial materials. Most studies using TR-NEWS in Earth Sciencehave focused on relatively small objects and may have multiple acousticsources. In Earth, within energy extraction settings, the structure and scaleof wellbores makes acoustic focusing challenging. This paper explores thefeasibility of applying TR NEWS for damage detection in wellbores byconstructing a laboratory-scale wellbore, and using TR to focus and makedynamic linear and nonlinear elastic measurements. After successive cycles ofinduced, localized mechanical damage the sample, the hysteretic nonlinearelastic parameter {\alpha}, increased with damage cycle indicating progressivemechanical damage. In addition to these strain-dependent changes, TR peak widthand changes to peak amplitude near the damage sites was also observed. Todeploy TR in a wellbore, it will be necessary to choose sensors that aresuitable for the environment, and that can be distributed along the wellbore.Thus, this paper demonstrates that acoustic TR can be conducted using both anintrinsic Fabry Perot interferometer fiber optic strain sensor, and anintrinsic Michaelson interferometer fiber optic strain sensor, as a first steptowards deployable sensing for TR in a wellbore.

Damage Detection in a laboratory-scale wellbore applying Time Reverse Nonlinear Elastic Wave Spectroscopy (TR NEWS)