DOWNHOLE TELEMETRY SYSTEMS AND METHODS WITH TIME-REVERSAL PRE-EQUALIZATION

摘要

Specific embodiments of disclosed downhole telemetry systems and methods employ time-reversal pre-equalization. One downhole telemetry system embodiment includes an acoustic transducer and a digital signal processor. The acoustic transducer transmits an acoustic signal to a distant receiver via a string of drillpipes connected by tool joints. The digital signal processor drives the acoustic transducer with an electrical signal that represents modulated digital data convolved with a time-reversed channel response. Due to the use of time-reversal pre-equalization, the received signal exhibits substantially reduced intersymbol interference.

主权项

1. A downhole telemetry system that comprises:
an acoustic transducer that transmits an acoustic signal to a receiver via a string of drillpipes connected by tool joints; and a digital signal processor that drives the acoustic transducer with an electrical signal that represents modulated digital data convolved with a time-reversed channel response.