DEVICE FOR HYDRODYNAMIC STIMULATION OF BOTTOMHOLE ZONE Russian patent published in 2003 - IPC

FIELD: oil producing industry, particularly, equipment for cleaning of well bottomhole. SUBSTANCE: device has pumping unit, body, pressure chamber with conical seat in lower part, discharge chamber, channel connecting the pressure chamber with discharge chamber and separating discharge and pressure chambers from each other, locking member in form of rubber ball. Device is provided with packer, jet pump located in body lower part, check valves unit installed in discharge chamber and hydraulically communicated with jet pump. Pumping unit is connected via wellhead equipment and gates. It supplies working fluid through tubing to pressure chamber and provides for abrupt pressure relief to its rated value. Pressure relief is needed for rubber ball to reach discharge chamber and for direction of working fluid through check valve of check valve unit to circular space between device body and jet pump body, and further on, to formation. Pumping unit provides for pumping of working fluid through annular space gate, inlet windows connected with annular space and circular space between device body and jet pump body for carrying out of clogging materials and reaction products from bottomhole zone. EFFECT: higher well productivity for long period of time. 1 dwg