METHOD OF INSPECTING A PIPE IN A WELL, PURPOSE-BASED PIPE INSPECTION TOOL FOR INSPECTING A PIPE IN A WELL AND COMPUTER-READABLE MEANS STORING COMPUTER-READY INSTRUCTIONS

摘要

Computer program methods, systems, and products for inspecting a pipe in a well using a eddy current-based pipe inspection tool comprise transporting the pipe inspection tool through the well, obtaining a first voltage measurement at an axial position when at least one main receiver tube. The first voltage measurement includes a residual voltage induced in the at least one main receiver by a residual magnetic field resulting from the residual magnetism in the tube. A second voltage measurement is obtained at said axial position along the tube from at least one second receiver. the first voltage measurement and the second voltage measurement are processed to obtain a processed measurement representing a difference between the first and second voltage measurements. The processed measurement is substantially free of residual voltage and can be used to estimate tube thickness and other tube characteristics.