FIELD: mining.
SUBSTANCE: group of inventions relates to the field of drilling, namely to the electric drives used in the downhole. Electric motor unit pipe-in-pipe comprises a drill string with an inner pipe and an outer pipe, and a motor with a controller, wherein the motor is provided with power supplied through the inner tube and the outer tube, each tube acts at least as a conductor, and an outer tube is electrically connected to ground, electronic equipment insert element connected to the inner tube, the insert facilitates the transfer of electrical power to the electric motor controller, the two ground lines connected with the insert element of the electronic equipment, wherein the ground line returns create an electrical path from the motor to the outer tube.
EFFECT: provided decrease in the volume of fluid required for the power section drive.
20 cl, 18 dwg
