METHOD OF PRODUCING FORMATION STIMULATION Russian patent published in 2000 - IPC

FIELD: oil-and-gas producing industry. SUBSTANCE: method may be used for increasing oil, gas, gas-condensate recovery from producing formations and reduction of water cutting of well production in the course of development of field by any other methods. The method includes installation of cement bridge in well above roof of producing formation; separation of lower part of flow string with cement bridge with milling cutter from upper part of flow string with formation of sump; lowering of flow string into upper part of tubing string with preliminary placing to its lower part of cylinder set with landing seats. Wellhead equipment is provided with lubricator. Located on day surface is pumping unit which pressure line is connected with tubing string. Intake line of pumping unit and flow-string-borehole annular space are connected with vessel. Well and all surface systems of the device are filled with fluid through vessel. Placed into tubing string through lubricator is a flexible ball. Under gravity, ball lowers onto upper seat. Pressure inside tubing string is raised to value when ball is forced through upper seat, then through lower seat, etc. Series of hydraulic impacts occurs. EFFECT: higher efficiency . 1 dwg