Patent ID: 6857486

Claim:
An apparatus to drill oil and gas wells comprising: (a) a subterranean electric drilling machine disposed in a wellbore that possesses at least one electric motor that rotates a rotary drill bit at a selected RPM, whereby said electric motor possesses first electrical input, whereby said electric motor properly operates with a particular voltage level applied to first electrical input, and whereby said electric motor dissipates in excess of 60 kilowatts with said particular voltage level applied to said first electrical input; (b) surface power supply means located on the surface of the earth providing first voltage output; (c) umbilical means disposed in the wellbore surrounded by well fluids connecting said surface power supply means to said subterranean electric drilling machine that provides electrical power to said first electrical input of said electric motor, whereby said umbilical means possesses insulated electric wires, whereby said umbilical means possesses high speed data communications means, and whereby said umbilical possesses a fluid conduit for conveying drilling fluids through the interior of said umbilical means; (d) means to measure first voltage applied to said first electrical input of said electrical motor; (e) means to transmit information related to said measured first voltage through said high speed data communications means within said umbilical to a computer located on the surface of the earth (f) computer controlled means to adjust said first voltage output so as to maintain first voltage input at said particular voltage level to provide proper operation of said electric motor within said subterranean electric drilling machine.