Vibration assembly and method

A method of transmitting a vibration to a drill string above a drill bit, comprising the steps of:

• a) providing a downhole vibration assembly comprising:
• a positive displacement power section disposed in an inner bore of a housing, the positive displacement power section including a rotor disposed at least partially within a stator, wherein the rotor is operatively suspended within the inner bore of the housing to rotate within the stator upon a fluid flow through the positive displacement power section;
• and a valve disposed above the positive displacement power section within the inner bore of the housing, the valve including a rotating valve segment and a stationary valve segment each including at least one fluid passage, wherein the rotating valve segment is configured to rotate with a rotation of the rotor for cycling the valve between an open position and a restricted position, wherein in the open position the fluid passage of the rotating valve segment is aligned with the fluid passage of the stationary valve segment, and wherein in the restricted position the fluid passage of the rotating valve segment is at least partially unaligned with the fluid passage of the stationary valve segment for restricting the fluid flow through the valve;
• b) securing the downhole vibration assembly between two segments of a drill string or on a coiled tubing line;
• c) lowering the drill string or coiled tubing line with the downhole vibration assembly into a wellbore;
• d) pumping a fluid through the drill string or coiled tubing line and through the downhole vibration assembly to rotate the rotor and the rotating valve segment for cycling the valve between the open position and the restricted position, wherein a pressure pulse is generated by the restriction of the fluid flow each time the valve is in the restricted position, and wherein the generated pressure pulses generate a stretching and retracting of the drill string or coiled tubing line initiating a vibration;
• and
• e) transmitting the vibration to the drill string or coiled tubing line above the downhole vibration assembly without the pressure pulse traveling through the positive displacement power section.