Oscillating shear valve for mud pulse telemetry and...

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

2005-12-13

2005-12-13

Bagnell, David (Department: 3672)

Communications: electrical

Wellbore telemetering or control

Modification of signal bandwidth, frequency, or circuit...

C340S855400, C175S040000, C367S084000

Reexamination Certificate

active

06975244

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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Monroe, Applying Digital Data-Encoding Techniques To Mud Pulse Telemetry, SPE 20326, Fifth SPE Petroleum Computer Conference, Denver, Colorado, Jun. 25-28, 1990, pp. 7-16.

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