Resources Contact Us Home
Wellbore telemetry and noise cancellation systems and method for the same

Image Number 4 for United States Patent #8004421.

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.

  Recently Added Patents
Methods and systems for detection of stoichiometry by Forster resonance energy transfer
System and method for operating a turbocharged engine
Semiconductor device and method of fabricating the same
Heat exchanger for removal of condensate from a steam dispersion system
Universal sign post base
Biosurfactant compounds produced by Aureobasidium pullulans
Control system for ozone sterilization in multiple compact chambers
  Randomly Featured Patents
Failure detecting method, failure detecting apparatus, and semiconductor device manufacturing method
Wristband with illuminated features
Information recording carrier and information reproducing apparatus for the same
Vehicle tie-down method and apparatus
System and method for secure communication over packet network
Sheet pile guide
Vehicle sensor system and process
Recording system using multiplexed inputs to a multichannel recorder
Admixture for concrete