High power umbilicals for subterranean electric drilling machines and remotely operated vehicles

The method of feed-back control of an electric motor having at least one voltage input located within a subterranean electric drilling machine located in a borehole that dissipates at least 60 kilowatts that receives power from a surface power supply through an umbilical surrounded by well fluids that possesses at least two insulated electric wires, whereby said umbilical also possesses high speed data link for data communications, comprising the steps of:

• (a) measuring the voltage input to said electric motor;
• (b) sending information related to said measured voltage input through said high speed data link to a computer located on the surface of the earth;
• and
• (c) using said computer to adjust the voltage output of said surface power supply that is used to control the voltage input to said electrical motor.

The method of feed-back control of an electric motor having at least one voltage input located within a remotely operated vehicle that dissipates at least 60 kilowatts that receives power from a power supply located on a ship through an umbilical surrounded by sea water that possesses at least two insulated electric wires, whereby said umbilical also possesses high speed data link for data communications, comprising the steps of:

• (a) measuring the voltage input to said electric motor;
• (b) sending information related to said measured voltage input through said high speed data link to a computer located on said ship;
• and
• (c) using said computer to adjust the voltage output of said power supply located on said ship that is used to control the voltage input to said electrical motor.

An apparatus to drill an extended reach oil and gas well to lateral radial distance of between 7 miles to 20 miles from the location of a surface drill site, 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, whereby said umbilical possesses a fluid conduit for conveying drilling fluids through the interior of said umbilical means and whereby said umbilical means is a approximately neutrally buoyant within said well fluids to reduce the frictional drag on said neutrally buoyant umbilibal;
• (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.

The method of feed-back control of an electric motor having at least one voltage input located within a subterranean electric drilling machine located in a borehole that dissipates at least 60 kilowatts that receives power from a surface power supply through an umbilical surrounded by well fluids that possesses at least two insulated electric wires, whereby said umbilical also possesses a high speed data link for data communications, whereby said umbilical is approximately neutrally buoyant within said well fluids to reduce the frictional drag on said umbilibal, comprising steps of:

• (a) measuring the voltage input to said electric motor;
• (b) sending information related to said measured voltage input through said high speed data link to a computer located on the surface of the earth;
• (c) using said computer to adjust the voltage output of said surface power supply that is used to control the voltage input to said electrical motor;
• and
• (d) using said feed-back control of said electric motor of said subterranean electric drilling machine to drill an extended reach oil and gas well to lateral radial distances of between 7 miles to 20 miles from the location of the surface drill site.