Patent ID: 9013957
Filing Date: 2015-04-21
Classification: E21B

Abstract:
1. An apparatus for generating pressure pulses in a drilling fluid, flowing within a drill string, comprising: a flow throttling device longitudinally and axially positioned within the center of a main valve actuator assembly, said main valve actuator assembly comprising a main valve pressure chamber, a magnetic cup encompassing a rotary magnetic coupling containing at least one magnet adjacent to a drive shaft wherein said magnetic cup is located within a pilot actuator assembly, said assembly including a pilot orifice with a pilot valve, a pilot flow shield, a bellows and an anti-rotation block such that passage of said drilling fluid flows through a pilot flow screen and into a main flow entrance into a flow cone through a main orifice and into a main valve past a main valve pressure chamber past a set of seals and through a main valve support block then through a flow seal guide where said fluid combines with a pilot exit fluid that flows toward a main exit flow such that as said fluid becomes a pilot fluid subsequently flowing through said pilot flow screen into said pilot flow screen chamber through a pilot flow upper annulus, through a pilot flow lower annulus and into a pilot flow inlet channel, wherein said pilot fluid then flows up into said main valve feed channel until it reaches said main valve pressure chamber such that said pilot fluid flows back down said main valve feed channel through said pilot flow exit channel through said pilot orifice and said pilot valve to exit said pilot valve and said pilot fluid then flows over said pilot flow shield such that it combines with said main flow becoming the main exit flow fluid, said main exit flow fluid then exits said pilot valve support block and flows on either side of said magnetic pressure cup including said rotary magnetic coupling and then finally past a drive shaft and motor such that said fluid causes one or more flow throttling devices to generate large, rapid controllable pulses thereby allowing transmission of well developed signals easily distinguished from noise resulting from other vibrations due to nearby equipment that is within said borehole or exterior to said borehole, said signals also capable of providing predetermined height, width and shape.