Patent ID: 8720602
Filing Date: 2014-05-13
Classification: B25D,E21B

Abstract:
1. Pulse generating device ( 200 , 300 ) for inducing a shock wave in a tool, wherein said pulse generating device ( 200 , 300 ) comprises an impact element ( 201 ; 301 ) for transferring energy to a drill string ( 202 ) having a longitudinal axis and connected to said tool, wherein the energy transfer generates said shock wave, said transferred energy consisting of more stored elastic energy than kinetic energy, wherein the device ( 200 ; 300 ) comprises a control element for controlling the interaction of the impact element ( 201 ; 301 ) with the drill string ( 202 ), and wherein said control element for controlling the interaction of the impact element ( 201 ; 301 ) with the drill string ( 202 ) comprises a motor ( 207 ; 307 ) having a rotation axis and at least two ducts in communication with at least one drive surface for driving said impact element, wherein said motor ( 207 ; 307 ), through rotation, alternately opens said ducts for increasing and decreasing pressure applied to said at least one drive surface ( 205 ), wherein the rotation axis of said motor (