Resources Contact Us Home
Oscillating shear valve for mud pulse telemetry

Image Number 15 for United States Patent #7808859.

An oscillating shear valve system for generating pressure fluctuations in a flowing drilling fluid comprising a stationary stator and an oscillating rotor, both with axial flow passages. The rotor oscillates in close proximity to the stator, at least partially blocking the flow through the stator and generating oscillating pressure pulses. The rotor passes through two zero speed positions during each cycle, facilitating rapid changes in signal phase, frequency, and/or amplitude facilitating enhanced, multivalent data encoding. The rotor is driven by a motorized gear drive. In one embodiment, a torsional spring is attached to the motor and the resulting spring mass system is designed to be near resonance at the desired pulse frequency. The system enables the use of multivalent encoding schemes for increasing data rates.

  Recently Added Patents
Methods for percutaneously extending an existing spinal construct
Microphonics suppression in high-speed communications systems
System and method for performing an image level snapshot and for restoring partial volume data
Method, apparatus, and system for deciphering media content stream
Coil component
Remote tracing of software on an avionic device
Magnetic resonance imaging
  Randomly Featured Patents
Electric power distribution system with battery backup
Combined hanging support and flower baskets therefor
Method for improved vehicle performance
Multi-spray shower head comprising a mist spray and locking device
Probing method and probing program
Parameter verification in an authentication system and method
Method and apparatus for producing semiconductor or metal particles
Reserve metering valve
Image processing apparatus, image processing method and computer readable medium
Systems and methods for automatic acoustic speaker adaptation in computer-assisted transcription systems