CONTINUOUS SUBSURFACE HEATER TEMPERATURE …

 · 1. 1-1363. canceled 1364. A method for assessing one or more temperatures of an electrically powered subsurface heater, comprising: assessing an impedance profile of the electrically powered subsurface heater while the heater is being operated in the subsurface and analyzing the impedance profile with a frequency domain algorithm to assess one or more temperatures of the heater.

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