Method and apparatus for creating a pressure pulse in drilling fluid to vibrate a drill string
AssigneeCougar Drilling Solutions Inc.
InventorTOM GUST
Life of this patent
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Abstract
A pressure pulse generating method and apparatus for use with a drill string includes a top and bottom subs for attaching the apparatus within the drill string; a rotor/stator; a drive assembly; and a nozzle sub which includes a nozzle assembly comprising a nozzle holder and a replaceable nozzle; and a nozzle housing having pulse openings. The nozzle holder has fluid ports which periodically align with the pulse openings as the nozzle holder rotates within the nozzle housing to achieve a desired pulse amplitude, frequency and waveform.
Claims23
A pressure pulse generating apparatus for use with a drill string, the apparatus comprising:
- a) a top sub and a bottom sub for attaching the apparatus within the drill string;
- b) a rotor/stator;
- c) a drive assembly;
- and
- d) a nozzle sub adapted to attach to the drive assembly and to house:
- i) a nozzle assembly comprising a nozzle holder being rotatably mounted within the nozzle sub and having a cylindrical nozzle external bearing surface which defines at least one fluid port, and a replaceable nozzle for controlling the pressure drop across the nozzle;
- and
- ii) a nozzle housing having a cylindrical internal bearing surface, defining at least one pulse opening, which mates with the nozzle holder external bearing surface, wherein the at least one nozzle fluid port periodically aligns with the at least one pulse opening as the nozzle holder rotates within the nozzle housing.
Dependencies are inferred from the claim text.