Communications: electrical – Wellbore telemetering or control
Reexamination Certificate
2005-03-15
2005-03-15
Horabik, Michael (Department: 2635)
Communications: electrical
Wellbore telemetering or control
C367S083000, C166S318000, C166S319000
Reexamination Certificate
active
06867706
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, or whether or not the drive means and the poppet are on the same side or opposite sides of the orifice. The oscillating valve is a bistable valve which preferably forms one wall of the drive piston of the pulser. Pressure from the drive cylinder behind the drive piston is directed in such a way as to unseat the bistable valve. When the bistable valve unseats, pressure is bled from within the drive cylinder, which also bleeds the pressure that unseated the bistable valve in the first place. When pressure drops, the bistable valve reseats, and the cycle repeats as long as pressure is being ported to the cylinder, thereby creating a tone in the drilling mud.
REFERENCES:
patent: 5390153 (1995-02-01), Scherbatskoy
patent: 5586084 (1996-12-01), Barron et al.
patent: 6233524 (2001-05-01), Harrell et al.
Dang Hung
Horabik Michael
Law Office of Tim Cook P.C.
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