Patent ID: 9007232
Filing Date: 2015-04-14
Classification: E21B,G01V

Abstract:
1. A method for communicating a signal through a fluid in a borehole between a first downhole location and a second uphole location, the method comprising: (a) receiving signals in the fluid at at least first and second spaced uphole positions, the received signals including at least a telemetry signal, a reflected telemetry signal, and a pump noise signal; (b) receiving a strobe signal from an active pump, the pump being in fluid communication with the first and second positions; (c) causing a processor to process the signals received in (a) and the strobe signal received in (b) to obtain pump signatures and clean signals at each of the first and second positions, the pump signatures including the pump noise signal and the clean signals including the telemetry signal and the reflected telemetry signal; (d) causing the processor to compute a transfer function between the first and second positions from the pump signatures obtained in (c); and (e) causing the processor to remove the reflected telemetry signal from at least one of the clean signals via processing the transfer function computed in (d) and the clean signals obtained in (c) so as to obtain the telemetry signal.