Patent ID: 7314083

Claim:
A rotary jetting tool for connection to a hollow, fluid conducting, workover string comprising; a main tool body with a hollow central passageway; a hollow central shaft extending the central passageway from the main tool body; a rotatable jet carrier mounted on the central shaft; a rotor, having a first mass and with fluid conducting passageways, mounted on the central shaft for rotation and limited axial movement; a head, with jet orifices, connected to the jet carrier and housing the rotor, so that the head jet carrier constitute a second mass; fluid flow reaction outlets in the rotor to urge rotation and axial movement thereof of the rotor with respect to the jet carrier; and a striking lug on the rotor and a cooperating reaction lug on the jet carrier, the lugs located so that relative rotation and axial movement of the rotor establish contact therebetween, and impact of the first mass on the second mass causes resulting in incremental rotation of the jet carrier and head, with the workover string fluid flow being discharged through the jet orifices of the incrementally rotated head.