Hydraulically balanced reciprocating pulser valve for mud...

Details Hydraulically balanced reciprocating pulser valve for mud... Hydraulically balanced reciprocating pulser valve for mud...

2005-05-24

2005-05-24

Wong, Albert K. (Department: 2635)

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

C137S269000, C175S040000, C367S083000, C367S081000

Reexamination Certificate

active

06898150

ABSTRACT:
A reciprocating pulser system for generating pressure fluctuations in a flowing drilling fluid comprising a reciprocating poppet and a stationary valve assembly with axial flow passages. The poppet reciprocates in close proximity to the valve assembly, at least partially blocking the flow through the valve assembly and generating oscillating pressure pulses. The poppet passes through two zero speed positions during each cycle, enabling rapid changes in signal phase, frequency, and/or amplitude thereby facilitating enhanced data encoding. The poppet is driven by a linear electric motor disposed in a lubricant filled housing. In one embodiment, the housing to shaft seal is a flexible bellows. In one embodiment, a force balance spring is used to essentially offset the hydraulic flow forces on the poppet. In one embodiment, a bypass poppet is used to adjust the differential pressure across the valve assembly.

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