Patent ID: 8665110

Claim:
A method for transmitting electric power into a bore hole, the method comprising: transforming an AC power signal into an increased voltage AC power signal on surface; rectifying the increased voltage AC power signal into an increased voltage DC power signal on the surface; transmitting the increased voltage DC power signal into the bore hole via an electric transmission line to a receiving station located in the bore hole; inverting the increased voltage DC power signal to an increased voltage downhole AC power signal using the receiving station, wherein: the increased voltage downhole AC power signal comprises three subsignals, each of which is 120° phase-shifted with respect to the other two, and the increased voltage downhole AC power signal has a frequency in a range of between 10 and 100 kHz; transforming the increased voltage and high frequency downhole three phase AC power signal to a reduced voltage and high frequency downhole three phase AC power signal using the receiving station; converting the reduced voltage and high frequency downhole three phase AC power signal to a reduced voltage and low frequency downhole three phase AC power signal having a frequency of several Hz or several tens of Hz; and supplying the reduced voltage and low frequency downhole three phase AC power signal to an electric motor located in the bore hole using the receiving station, wherein: the motor is part of an electric submersible pump, the pump and receiving station are located within a bore of a bore hole tube, the pump produces hydrocarbons to the surface through the bore of the tube, and the electric transmission line extends from the surface to the receiving station through the bore of the tube.