The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 12, 2017
Filed:
Jun. 25, 2015
Evolution Engineering Inc., Calgary, CA;
Evolution Engineering Inc., Calgary, CA;
Abstract
A fluid pressure pulse generator for a downhole telemetry tool comprising a stator and a rotor. The stator has a stator body and a plurality of radially extending stator projections spaced around the stator body, with adjacently spaced stator projections defining stator flow channels extending therebetween. The rotor has a rotor body and a plurality of radially extending rotor projections spaced around the rotor body, with adjacently spaced rotor projections defining rotor flow channels extending therebetween. The rotor projections are axially adjacent the stator projections. The rotor is rotatable relative to the stator and is configured to oscillate from an open flow position an equal span of clockwise and counter clockwise rotation to first and second restricted flow positions. In the open flow position the rotor projections align with the stator projections with an axial central line of the stator projections circumferentially offset from an axial central line of the rotor projections and the rotor flow channels are in fluid communication with the stator flow channels so that drilling fluid flows through the fluid pressure pulse generator apparatus. In the first and second restricted flow positions the rotor projections are in fluid communication with the stator flow channels to create a pressure pulse in the drilling fluid flowing through the fluid pressure pulse generator apparatus. The equal span of clockwise and counter clockwise rotation is selected so that a gap is formed between the rotor projections and the stator projections in at least one of the first and second restricted flow positions for flow of drilling fluid therethrough and a greater proportion of the rotor projections is in fluid communication with the stator flow channels in one of the first and second restricted flow positions than in the other of the first and second restricted flow positions. The fluid pressure pulse generator creates pressure pulses with different pulse heights through symmetrical rotation of the rotor relative to the stator.