Pump noise reduction and cancellation

摘要

A method for transmitting data from a downhole component includes: measuring a borehole fluid pressure by a receiver at a selected sampling rate and estimating a pressure signal transmitted through the fluid based on the sampled fluid pressures; measuring, by at least one pump stroke sensor, operation of a pump configured to advance fluid through the borehole; identifying individual stroke events from the pump stroke sensor measurement; generating a digital pump stroke signal in response to detecting one or more stroke events, each pump stroke signal including a digital time value associated with each of one or more stroke events; and transmitting the pump stroke signal to the receiver.

主权项

1. A method for transmitting data from a downhole component, the method comprising:
receiving a fluid pulse telemetry signal at a receiver, wherein receiving includes measuring a borehole fluid pressure by the receiver at a selected sampling rate and estimating the telemetry signal transmitted through the fluid based on the sampled fluid pressures; measuring, by at least one pump stroke sensor, operation of a pump configured to advance at least a portion of the borehole fluid through the borehole, wherein measuring includes detecting one or more individual events related to movement of one or more components of the pump; generating a digital pump stroke signal for each of the one or more individual events, each digital pump stroke signal including a digital time value associated with one of the one or more individual events; and transmitting the telemetry signal and each digital pump stroke signal to a signal processing unit, the signal processing unit configured to remove a pump signature from the telemetry signal.