Full flow pulser for measurement while drilling (mwd) device

Abstract

An apparatus, method, and system described for generating pressure pulses in a drilling fluid utilizing a flow throttling device longitudinally and axially positioned within the center of a main valve actuator assembly is described. The main valve actuator assembly includes a main valve pressure chamber, a magnetic cup encompassing a rotary magnetic coupling, and a pilot actuator assembly. Passage of drilling fluid through a series of orifices, valves, shields, and screens where the fluid eventually combines with a pilot exit fluid that flows toward a main exit flow such that as the fluid becomes a pilot fluid that ultimately combines with the main flow such that the combined fluid causes one or more flow throttling devices to generate large, rapid controllable pulses that produce transmission of well developed signals easily distinguished from other noise resulting from other vibrations due to nearby equipment that is within or exterior to the borehole such that the signals also provide predetermined height, width and shape.