Pressure pulse generator for measurement-while-drilling systems which produces high signal strength and exhibits high resistance to jamming

摘要: A system is disclosed for generating and transmitting data signals to the surface of earth while drilling a borehole, operating by pressure pulses in fluid filling drill string. The designed maximize signal strength minimizing probability jamming particulates. uses rotary valve modulator consisting stator with flow orifices through which flows, rotor rotates respect thereby opening restricting pulses. “closed” position are configured reduce jamming, simultaneously minimize area order strength. This accomplished imparting shear modulator, aspect ratio maximizing minimum principal dimension closed area. preferred embodiment three alternate embodiments disclosed.