Apparatus and Method for Vibrating a Drill Bit

A method for drilling a well bore, comprising the steps of:

• providing a drill bit with an axis of rotation and a drill bit body intermediate a threaded end and a working face;
• the drill bit body comprising a fluid passageway housing a jack element;
• a stop element disposed within the passageway comprising a first near-sealing surface;
• the jack element comprising a valve portion and an indenting end extending through the working face;
• the valve portion comprising a second near-sealing surface disposed adjacent the first near-sealing surface;
• applying a first axial force by pressurizing the fluid passageway of the drill bit;
• and
• applying an opposing force to the jack element.
• wherein the first near-sealing surface and the second near-sealing surface form a restriction in a fluid passage from the fluid passageway to at least one opening disposed in the working face;
• wherein the restriction causes the pressure in the fluid passageway to build up until it overcomes the opposing force and displaces the jack element in the direction of the first axial force, opening the restriction and thereby relieving the pressure in the fluid passageway, wherein after relieving the pressure in the fluid passageway, the opposing force overcomes the first axial force and substantially returns the jack element to its original position and reforms the restriction.