Patent ID: 8811118

Claim:
A method of communicating a telemetry signal from a downhole location to an uphole location during drilling operations, the method comprising: measuring a first signal indicative of a drilling noise at a location near the source of the noise in a communication channel in the borehole; using the telemetry signal and the first signal to activate a pulser and provide an uplink signal at the downhole location in the borehole such that effects of the drilling noise on the uplink signal are mitigated receiving a second signal at the uphole location responsive to the uplink signal; and processing the second signal for estimating the telemetry signal wherein providing the uplink signal further comprises: (i) measuring a third signal responsive to the uplink signal at a location near the downhole location and between the downhole location and the uphole location; (ii) filtering the first signal using a filter derived from the third signal and the first signal; and (iii) combining the telemetry signal and the filtered first signal; and wherein the filter is further derived from sampling, prior to measuring the first signal, a signal at the location near the source of the noise during a training period when there is drilling noise and no telemetry signal.