Davis Wright Tremaine LLP
System and method for regulating an electromagnetic telemetry signal sent from downhole to surface
A method for regulating an electromagnetic (“EM”) telemetry signal sent from downhole to surface includes determining a value of a controlled parameter of the EM telemetry signal, comparing the value of the controlled parameter to a configuration value, and adjusting the value of the controlled parameter in a first direction towards the configuration value while monitoring a feedback parameter of the EM telemetry signal when the value of the controlled parameter and the configuration value differ. The controlled parameter is one of transmission voltage and transmission current, and the feedback parameter is the other of transmission voltage and transmission current. The value of the controlled parameter ceases to be adjusted in the first direction upon the earlier of either of the following occurring: the value of the controlled parameter substantially equals the configuration value, a value of the feedback parameter meets a feedback parameter cutoff threshold, and a product of the controlled and feedback parameters meets a power cutoff threshold.
EVOLUTION ENGINEERING INC.
E E E G H
E21B E21B E21B G01V H04W
inventional inventional additional additional inventional
David A. Jili Jinhua Aaron W.
Switzer Liu Wang Logan