Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Reexamination Certificate
2007-10-09
2010-10-05
Bugg, George A (Department: 2612)
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
Through well fluids
C367S030000, C367S081000, C340S853100, C340S854300, C340S855400, C175S048000
Reexamination Certificate
active
07808859
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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S.P. Monroe, Applying Digital Data-Encoding Techniques to Mud Pulse Telemetry; pp. 7-16.; Baker Hughes Drilling Systems.
Eggers Heiko
Hahn Detlef
Peters Volker
Rouatbi Cedric
Baker Hughes Incorporated
Bugg George A
Cantor & Colburn LLP
Yacob Sisay
LandOfFree
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