Patent ID: 8446292
Filing Date: 2013-05-21
Classification: G01V

Abstract:
1. A system for communication between surface equipment and downhole equipment over a power cable of indeterminate length, the system comprising: surface equipment; downhole equipment positioned in a borehole; a power cable coupled between the surface equipment and the downhole equipment and configured to provide power from the surface equipment to the downhole equipment; and a transmitter coupled to one of the surface equipment and the downhole equipment and a receiver coupled to the other of the surface equipment and the downhole equipment; wherein the transmitter is configured to generate a plurality of modulated high frequency data signals and to transmit the high frequency data signals on the power cable, wherein each of the high frequency data signals has a different frequency, and wherein each of the high frequency data signals is modulated to carry a common data stream; wherein the receiver is configured to receive the plurality of high frequency data signals and to demodulate the common data stream from at least one of the high frequency data signals.