Patent ID: 9316063
Filing Date: 2016-04-19
CPC Classification: E21B

Claim Text:
1. A system for applying power into a wellbore within a subterranean formation, the system comprising: a tubing string comprising a plurality of electrically conductive tubing pipes mechanically coupled end-to-end, wherein the tubing string comprises a top neutral section positioned proximate to an entry point of the wellbore and a power-transmitting section positioned below the top neutral section in the wellbore, and wherein the tubing string has a first cavity running therethrough; a first isolator sub mechanically coupled to and positioned between the neutral section and the power-transmitting section of the tubing string, wherein the first isolator sub has the first cavity running therethrough, wherein the first isolator sub electrically separates the top neutral section from the power-transmitting section, and wherein the first isolator sub is configured to isolate direct current (DC) power and alternating current (AC) power from the top neutral section; a second isolator sub mechanically coupled to the tubing string, wherein the tubing string further comprises a bottom neutral section positioned toward a distal end of the wellbore, wherein the second isolator sub is positioned between the bottom neutral section and the power-transmitting section of the tubing string, wherein the second isolator sub has the first cavity running therethrough, wherein the second isolator sub electrically separates the bottom neutral section from the power-transmitting section, and wherein the second isolator sub is configured to isolate the DC power and the AC power from the bottom neutral section; a power source positioned above the entry point and electrically coupled to a top end of the power-transmitting section of the tubing string below the first isolator sub; and an electrical device disposed within the wellbore and electrically coupled to the power-transmitting section of the tubing string above the second isolator sub.