METHOD TO EXCITE OSCILLATIONS IN WELL LIQUID Russian patent published in 2007 - IPC E21B28/00 E21B43/25 E21B43/16 

FIELD: mining, particularly to develop and rework producing wells, namely to stimulate reservoir fluid inflow.

SUBSTANCE: method involves lowering hammer connected to flexible suspension means in pipe string filled with liquid; exciting periodical oscillations by axial hammer movement with speed selected to transmit strikes of necessary force applied to pipe string walls; increasing hammer speed by transmitting rod pump piston movement energy thereto through pulley-block including flexible suspension means, wherein the rod pump is located in well over the hammer. The pulley-block comprises fixed block installed at lower end of rod pump cylinder and movable block connected to lower end of rod fastened to rod pump piston by upper end thereof.

EFFECT: increased speed of axial hammer movement and multiplication of wave reservoir fluid oscillation energy.

1 dwg