Casing Eccentering Sensitivity of Pulsed Eddy Current Sensors in Multiple-Casing Corrosion Analysis

The performance and potential ambiguity in casing thickness evaluation using pulsed eddy current (PEC) measurement interpretation based on response time to depth mapping is assessed for realistic downhole settings. Casing eccentering sensitivity analysis based on 3D fmite-element method is performed for PEC sensors of variable lengths. The effect of defect size, approaching defects and casing collars for three casing configurations is also studied to highlight the increased interpretation uncertainty in realistic noncentered environments.