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
System and method for managing a loyalty program via an association network infrastructure
Method of preparing MgB.sub.2 superconducting wire and the MgB.sub.2 superconducting wire prepared thereby
Output queued switch with a parallel shared memory, and method of operating same
Bio-pesticide and method for pest control
Adhesive structure of optical device, adhesion method, and optical pickup device
Control method and allocation structure for flash memory device
Closed-loop adaptive adjustment of pacing therapy based on cardiogenic impedance signals detected by an implantable medical device
  Randomly Featured Patents
Copolymers and coprepolymers formed from mono-substituted fluorinated oxetane monomers and tetrahydrofuran
Heat treatment for a panel and apparatus for carrying out the heat treatment method
Information processing apparatus connected to a network and control method for the same
Polynucleotide sequence assay
Magnetic random access memory (MRAM) device on thermally-sensitive substrate
Aqueous liquid deoxidizing composition and process for aluminum, with low foaming tendency
Device for recording and handling of information regarding time and activities
Splicing and loading of tape into cassettes with a stationary splicing block
Ultrasonic motor driving circuit
Static dissipative elastomeric coating for electronic packaging components