Downhole pressure pulse generator

摘要: A pressure pulse generator (100) is constructed of a stator (104) and rotor (102) mounted within housing (30). The are each configured with central hub (110, 110') one or more lobes (106, 106') radially extending therefrom. An equal number ports (108,108') spaced between the 106'). (106) preferably cross-sectionally tapered in streamwise direction, being narrower at their upstream ends than downstream (106'). maintained (30) coaxial relation from other. axial distance may be selectively varied by linear actuator (120) which, preferred embodiment, solenoid assembly. operably associated to move it axially respect first position, wherein reduced, second increased. energized response signals an encoder (38).