FIELD: oil well operation, particularly to supply power and communication signals to downhole device.
SUBSTANCE: oil well has borehole with pipe structure arranged inside the borehole, communication system performing transmission of time-varying signal along pipe structure, as well as hydraulic system electrically linked with pipe structure and adapted to be connected to downhole device, to receive power and to control downhole device. Communication system also has impedance device arranged around pipe structure to form conductive section in which signal interference is provided, wherein the signal is current. To operate downhole device working liquid pressure is increased with the use of current. Hydraulic drive system comprises electric drive for above signal receiving, which activates pump to increase working liquid pressure. Connected to pump is drive actuated by working liquid and connected to downhole device in its working position to operate the downhole device. Signal may include communication signal to selectively operate downhole device, particularly valve.
EFFECT: decreased electric power losses during signal transmission to downhole device.
26 cl, 6 dwg
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