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
Method of detecting a structure in a field, a method of steering an agricultural vehicle and an agricultural vehicle
Fan unit assembly
Buffered viewing of electronic documents
Model for system-wide application extension
Methods and systems for an action-based interface for files and other assets
Configurable common reference signal port for reference signal received power in distributed antenna systems
Image compression device, image expansion device, and image processing apparatus
  Randomly Featured Patents
Method for paging and stopping paging to an idle MS and a paging apparatus
Thin film transistor substrate, liquid crystal panel and liquid crystal display device using the same
Purifying method for metallic silicon and manufacturing method of silicon ingot
Processive sugar transferase
Method for monitoring and managing operational characteristics of workstations on a network without user network impact
Self-destruct fish hook
Bluetooth cassette-like device for a hands-free cell-phone kit
Device for mounting and fixing a brake on a cycle
Rotor blade with integral platform and a fillet cooling passage
Wastecan