Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Disk drive
Heat shield and laminated glass
Wrench head
Preparation process of transition metal boride and uses thereof
Method for testing multi-chip stacked packages
Protocol delay measuring device and protocol delay measuring method
Generating network topology parameters and monitoring a communications network domain
  Randomly Featured Patents
Cordyline plant named `Paradise`
Electron-optical system exhibiting reduced aberration
Data collection in spectroscopy
Opener box
Extrusion head
Programmable attenuator
Cardiac ablation device with movable hinge
Cable testing apparatus
Multivariable process trend display and methods regarding same
Temporary closure for use with storage tanks