METHOD FOR LOGGING BEHIND CASING

摘要

A method for logging a subterranean formation from within a well that has been cased and cemented is disclosed. An acoustic signal is transmitted into the form ation from a pulse-echo transducer placed within the wellbore and the first casing echo and the first formation echo are detected. The amplitude and the arrival times of these two ec hoes, combined with some known information about the wellbore, the casing, and the cem ent enable several parameters to be calculated. These parameters in turn may be used to image the formation around the well.