Method and apparatus for generating fluid pressure pulses

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids

Reexamination Certificate

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C166S249000, C166S263000, C166S104000, C166S177600, C175S106000, C175S107000

Reexamination Certificate

active

07405998

ABSTRACT:
Apparatuses and methods for generating fluid pressure pulses are disclosed. An example apparatus may include a chamber that can collect fluid and an upstream ported disc coupled to a downstream end of the chamber. The upstream ported disc may rotate about a central axis. The upstream ported disc includes an upstream eccentric port that rotates about the central axis as the upstream ported disc rotates. The example apparatus may include a downstream ported disc coupled to a downstream end of the upstream ported disc such that the downstream ported disc remains substantially rotationally fixed relative to the upstream ported disc. The downstream ported disc includes a downstream eccentric port that may align with the upstream eccentric port to form a passageway for fluid to exit from the chamber to outside of the apparatus, at some time in a rotation cycle of the upstream ported disc.

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