A method for transmitting signals through a metal tubular includes the steps of transmitting modulated electromagnetic signals through a non magnetic metal section of the metal tubular, detecting the signals or a field associated with the signals, and controlling or monitoring devices or operations associated...http://www.google.fr/patents/US7063148?utm_source=gb-gplus-shareBrevet US7063148 - Method and system for transmitting signals through a metal tubular
Method and system for transmitting signals through a metal tubular
