Patent ID: 6866104
Filing Date: 2005-03-15
Classification: E21B

Abstract:
1. A downhole vibration tool, comprising: a hollow tool body adapted for lowering into a well bore; a longitudinally slidable hollow piston mounted in an inner bore within said tool body, said piston having an inner bore, said piston being biased in a first longitudinal direction; an inner bore through said tool body substantially matching the diameter of said inner bore through said piston; an activation assembly adapted to be pumpable downhole through a work string, said activation assembly having an outer diameter sized to allow landing of said activation assembly in said inner bore of said tool body, said activation assembly being adapted to latch in said inner bore of said tool body; and a vibratory mechanism within said activation assembly, said vibratory mechanism being adapted to repetitively apply force on said piston in a second longitudinal direction, said activation mechanism being adapted to repetitively release said force on said piston.