Patent ID: 9273529
Filing Date: 2016-03-01
CPC Classification: E21B

Claim Text:
1. A pulse generator comprising: a stator coupled to a housing; a rotor rotatably disposed within the housing; an annulus formed between the rotor and the stator; an inner bore formed through the rotor; one or more outer flow ports that provide fluid communication between the annulus and the inner bore; and a retrievable valve assembly rotationally coupled to the rotor and at least partially disposed within the inner bore, wherein the retrievable valve assembly includes a rotary valve member having one or more primary flow ports, and a linear adjustment mechanism for moving the rotary valve member from a first position to a second position; wherein a fluid flow path is periodically formed by the one or more outer flow ports, the annulus, and the one or more primary flow ports as the rotor rotates.