Oscillating shear valve for mud pulse telemetry

Details Oscillating shear valve for mud pulse telemetry Oscillating shear valve for mud pulse telemetry

2007-10-09

2007-10-09

Hofsass, Jeffery (Department: 2612)

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

C367S030000, C367S081000, C340S853100, C340S854300, C340S855400, C175S048000

Reexamination Certificate

active

11270243

ABSTRACT:
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.

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