3642066 is referenced by 71 patents and cites 9 patents.

Two well bores extend from the surface into the oil bearing formation defining a producing well and an electrode well. Electrodes in each well, contacting the formation, are connected to a unidirectional current voltage source at the surface through conductive tubing or pipe in the respective well bores to produce a unidirectional voltage gradient between the electrodes, with the producing well poled to be the cathode. Additionally, an alternating current voltage source is connected between the producing well electrode and another conductive path extending from the surface to the formation, to effect the flow of alternating current through the formation adjacent to the producing well to heat the formation.

Electrical method and apparatus for the recovery of oil
Application Number
Publication Number
Application Date
November 13, 1969
Publication Date
February 15, 1972
Gill William G
The Electrothermic Co
E21b 43/16
E21B 43/24
E21B 43/16
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