A system and method for downhole power delivery. In one embodiment, the system
delivers computer-regulated downhole power voltages, and may be configured to customize
signal waveforms and power allocation on the various independent signal transmission
modes to maximize the power capacity of the logging cable subject to its maximum
voltage rating. In one embodiment, the system includes a standard multiconductor
logging cable which supports orthogonal signal transmission modes on circumferentially
spaced insulated conductors. A high-power power source on the surface is coupled
to the insulated conductors in the cable to drive a power signal on the lowest
impedance signal transmission mode. The system may further include multiple power
sources operating on different independent signal transmission modes, and may also
include multiple telemetry channels which share the power transmission modes via
frequency multiplexing.
