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
System and method for producing statistically valid assay means and ranges for quality control materials
System and method for providing an extended platform for an operating system
In-vehicle electronic control apparatus having monitoring control circuit
Bandpass filter and radio communication module and radio communication device using the same
Adjustable draw bar for trailer hitches
Switched capacitor hold-up scheme for constant boost output voltage
Generating and modifying textual code interfaces from graphical programs
  Randomly Featured Patents
Visor for cap or the like
Connecting element for sheet piles
Nuclear magnetic resonance systems
High frequency, field-effect transistor
Bathroom mirror defogger
Semiconductor device with integrated circuit elements of group III-V comprising means for preventing pollution by hydrogen
Ball joint
Systems, methods, and apparatuses for stacked memory
Apparatus for and method of producing slurry material without stirring for application in semi-solid forming