Self-excitation wave waterflooding device

The utility model relates to a self-excited injector, comprising a housing, a piston, an upper joint and a nozzle; wherein, the nozzle (7) is arranged on the housing (8) wall, the upper end of the housing has a pressure conducting hole (4), the inner chamber of the housing is step-like and is provided with the piston (5) with a boss, the inner chamber of the piston is a through hole, the upper joint (1) and the upper oil pipe are connected, the housing and the lower oil pipe are connected, the nozzle (7) arranged in the housing (7) is a self-oscillating cavitating jet nozzle generating self-oscillating cavitating jet in the process of normal injection to generate pressure oscillation and cavitating noise under the ground to change the traditional continuous pressure injection into wave pressure injection to slow down the precipitation of mechanical impurity.