Patent ID: 9540926
Date: 2017-01-10
CPC Classifications: E21B

Claim:
1. A rotary pulser configured to transmit information from a downhole location in a well formed in an earthen formation toward the surface through a drilling fluid that passes through a drill string, the pulser comprising: a housing configured to be supported along an inner surface of the drill string; a stator supported in the housing, the stator defining an uphole end, a downhole end spaced from the uphole end in a longitudinal direction, a plurality of passages that extends through the stator along the longitudinal direction, and at least one projection carried by the downhole end and disposed adjacent to a respective at least one passage of the plurality of passages; a rotor rotatably supported adjacent to the downhole end, the rotor including a plurality of blades that extend outwardly in a radial direction that is perpendicular to the longitudinal direction, the rotor configured to transition between at least an open position, whereby the plurality of blades are offset from the plurality of passages, to a closed position, whereby the plurality of blades partially obstruct the plurality of passages and at least one of the blades is disposed along the at least one projection, wherein transition of the rotor between the open position and the closed position when drilling fluid is flowing through the plurality of passages generates a series of pulses encoded with the information to be transmitted.