Importance

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Abstract

A fluid pressure pulse generator for a downhole telemetry tool comprising a stator and a rotor. The stator comprises a stator body and a plurality of radially extending stator projections spaced around the stator body, whereby adjacently spaced stator projections define stator flow channels extending therebetween. The rotor comprises a rotor body and a plurality of radially extending rotor projections spaced around the rotor body. The rotor projections are axially adjacent to the stator projections and the rotor is rotatable relative to the stator such that the rotor projections move in and out of fluid communication with the stator flow channels to create fluid pressure pulses in fluid flowing through the stator flow channels. The rotor projections may be positioned downhole of the stator projections and include a self-correction mechanism to move the rotor to an open flow position where the rotor projections are out of fluid communication with the stator flow channels if the telemetry tool fails. The stator body may be configured to fixedly attach to a pulser assembly of the downhole telemetry tool and the rotor may be configured to fixedly attach to a driveshaft of the pulser assembly with the driveshaft and/or the rotor body received within the bore of the stator body such that the stator projections are positioned between the pulser assembly and the rotor projections.

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First Claim