BOREHOLE ASSEMBLY FOR BOTTOMHOLE FORMATION ZONE TREATMENT AND IMPULSIVE DEVICE FOR BOREHOLE ASSEMBLY Russian patent published in 2006 - IPC E21B37/00 E21B43/25 

FIELD: oil production equipment, particularly for bottomhole formation zone treatment.

SUBSTANCE: borehole assembly comprises pipe string and impulsive device hydraulically connected with elastic vibration oscillator by overflow channel. Impulsive device and elastic vibration oscillator are arranged in hollow bodies connected one to another by sleeve provided with at least one window. Elastic vibration oscillator and impulsive device outputs are connected by pipe having at least one window communicated with sleeve window by channel. Lower hollow body end is closed with cap. Upper hollow body is connected with pipe string. Impulsive device and elastic vibration oscillator are hydraulically linked through inputs thereof. Impulsive device includes body with supply channels, piston and bush with grooves for stop, annular cavity arranged in body and provided with orifices for stop receiving and piston underside part communicated with space below the bush. The piston and the bush are spring loaded relative the body. Seat is installed in the body. Upper bush part has valve and is arranged in annular cavity of the body so that valve may be installed in seat and displaced along seat axis and annular cavity. The supply channel has pressure or flow regulator. Piston is installed in axial body cavity and spring-loaded relative it through rod. Piston head part is hydraulically connected with piston underside part and with space above seat and valve through the rod.

EFFECT: increased operational efficiency due to extended capabilities and widened range of application in wells of different types having different depths and reduced power inputs.

16 cl, 2 dwg