METHOD FOR DETERMINING THE PROPERTIES OF A PIPE COLUMN OF ONE OR MORE PIPE COLUMNS IN AN UNDERGROUND FORMATION AND SYSTEM FOR DETERMINING A PIPE COLUMN IN ONE OR MORE PIPE COLUMN

摘要

A system for determining properties of a pipe column in an underground formation includes a measuring device that obtains a plurality of pipe column measurements at a specific location. the plurality of measurements corresponds to a plurality of transmitter signal frequencies or a plurality of measurement time intervals measured by at least one receiver and a pipe column thickness and diameter at the specific location are known. the system further includes a processor that determines a plurality of calibration coefficients based on the plurality of measurements, known thickness and known diameter: assigning calibration coefficients of equal magnitude to measurements corresponding to at least two frequencies of the plurality of transmitter signal frequencies; or assigning calibration coefficients of a value equal to measurements corresponding to at least two intervals of the plurality of measurement time intervals.