Wellbore telemetry and noise cancellation systems and method...

Details Wellbore telemetry and noise cancellation systems and method... Wellbore telemetry and noise cancellation systems and method...

2011-08-23

2011-08-23

Edwards, Jr., Timothy (Department: 2612)

Communications: electrical

Wellbore telemetering or control

Using a specific transmission medium

C340S855500, C340S855400, C367S082000, C367S083000, C166S066000

Reexamination Certificate

active

08004421

ABSTRACT:
A method of signal processing includes providing at least a first pressure sensor and a second pressure sensor spaced in a drilling system and using an algorithm to separate the downwardly propagating waves from the upwardly propagating waves. In one or more examples, an algorithm may include determining a velocity of pressure signals in a wellbore, time-shifting and stacking pressure signals from at least the first pressure sensor and the second pressure sensor to determine a downwardly propagating noise signal, and subtracting the downwardly propagating noise signal from at least the signal from the first pressure sensor.

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