Oscillating shear valve for mud pulse telemetry and associated methods of use

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