PAL. A well log which combines magnetic-flux-leakage and eddy-current measurements in such a manner as to locate defects or flaws on the inner or outer wall of a casing, as well as to provide a measurement which is indicative of the extent of such defects.
Magnetic-flux-leakage testing relies upon the detection of perturbations in a magnetic field caused by defects anywhere on the inside or outside casing wall. For the eddy-current test, the frequency of the eddy current is chosen so that the depth of investigation will be limited to the inner casing wall. The electromagnetic thickness log is frequently run in conjunction with the Pipe Analysis Log where concentric casing strings are set in order to provide information helpful in the analysis of the outer casing string. PAL is a mark of Schlumberger.