Hydraulic oscillator for use in a transmitter valve

Details Hydraulic oscillator for use in a transmitter valve Hydraulic oscillator for use in a transmitter valve

2008-01-15

2008-01-15

Wong, Albert K. (Department: 2612)

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

C367S085000, C340S854400, C340S853100, C251S318000, C251S321000, C175S038000

Reexamination Certificate

active

07319638

ABSTRACT:
An oscillating valve driven by the pressure in a mud pulser develops a pressure variation in the mud pulse signal that is at a frequency that is different than the frequencies of the mud system. The oscillating valve is coupled to or integral with the pulse drive cylinder, whether the drive means for operation of the pulser is upstream or downstream from the orifice. A bistable valve improves performance of the transmitting element at low flow rates by providing a toggle mechanism which assures positive seating of the bistable valve.

REFERENCES:
patent: 4908804 (1990-03-01), Rorden
patent: 5390153 (1995-02-01), Scherbatskoy
patent: 5586084 (1996-12-01), Barron et al.
patent: 6233524 (2001-05-01), Harrell et al.
patent: 6839000 (2005-01-01), Das et al.
patent: 6867706 (2005-03-01), Collette
patent: 6898150 (2005-05-01), Hahn et al.
patent: 7145834 (2006-12-01), Jeter
patent: 7180826 (2007-02-01), Kusko et al.

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