Patent ID: 7958952

Claim:
A controllable downhole drilling system comprising; a pulsing drilling device (PDD) residing in a downhole drill string in a borehole in a fluid environment wherein said PDD comprises; a pilot valve and a fast acting pilot valve with a pilot valve bellows, in contact with a pilot seat such that fluid in said fluid environment stops flowing through a guide pole channel forcing said fluid to back up and subsequently flow through connecting channels and into an internal chamber which fills with fluid and moves an actuator toward an actuator seat such that the flow of fluid is restricted through an actuator orifice as said fluid is directed downstream to drill bits such that when said actuator moves to restrict the flow of fluid the pressure above said actuator builds up within a well bore casing converting the nominal kinetic energy of the fluid into high potential energy and inversely, when said pilot valve is deactivated and not contacting said pilot seat the flow of said fluid through said guide pole channel is restored thereby draining said internal chamber and said connecting channels such that said actuator withdraws from said actuator seat, allowing for opening of said actuator orifice such that said high potential energy created in the fluid as high pressure is suddenly released through said actuator orifice flowing through said well bore casing and through jets situated below said actuator allowing said fluid to flow into an annulus between said well bore casing and a formation within which said well bore resides resulting in actuation and deactivation of said actuator within milliseconds and wherein said PDD provides a first signal to close said pilot valve within said fluid environment thereby restricting a portion of the flow of said fluid within said drill string allowing for a sudden increase in pressure of said fluid on one surface of said fast acting valve within said drill string, said increased pressure resulting in a first axial unidirectional pulse and associated force through said PDD in said drill string applied directly above a bottom hole assembly (BHA), wherein said pulse forces a drill bit into a formation, and wherein said pilot valve receives a second signal to open said fast acting valve, creating a second unidirectional pulse in a direction opposite to said first axial unidirectional pulse, thereby releasing said increase in pressure within said fluid surrounding said drill bit, allowing for cleansing of said drill bit from particles formed during drilling into said formation.