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
Peptides useful in the treatment and/or care of skin, mucous membranes, scalp and/or hair and their use in cosmetic or pharmaceutical compositions
Communication apparatus, and method and program for controlling same
Method and apparatus for web crawling
Method and device for generating low-jitter clock
Plants and seeds of corn variety CV294874
Image stabilization apparatus and image pickup apparatus
Label printer
  Randomly Featured Patents
Retractable surgical instrument with curved operative element
Method and means for reducing false alarm rates in security systems
Extremely high speed, real-time background filter for radiation detectors
Portable air conditioning unit
All-MOS precision differential delay line with delay a programmable fraction of a master clock period
Predistortion circuit with combined odd-order and even-order correction
Output buffer with low-voltage devices to driver high-voltage signals for PCI-X applications
Restricted access telephones for logical telephone networks
Method for lowering plasma levels of lipoprotein (a)
EGR Control system for diesel engine