METHOD OF PRODUCING FORMATION DEVELOPMENT Russian patent published in 2003 - IPC

FIELD: oil producing industry; applicable in tapping and development of oil producing formation on new and already operating wells for stimulation and renewal for operation of wells at late stage of development, and also for increase of injectivity of injection wells used for maintaining formation pressure. SUBSTANCE: method includes perforation of casing string of, as least, one well and cutting of channel in cement stone, withdrawal of product from producing well with subsequent cutting of channel in formation. Perforation is effected by introduction into casing string to preset depth of guide shoe secured in suspension of tubing, introduction of high-pressure flexible hose into guide shoe, installation on its end of hydraulic motor, flexible shaft and toothed milling cutter. Flexible shaft and milling cutter are hydraulic motor, flexible shaft and toothed milling cutter. Flexible shaft and milling cutter are rotated by hydraulic motor to form hole in casing string and channel in cement stone. Flexible hose with hydraulic motor, flexible shaft, and milling cutter are withdrawn from guide shoe. Introduced into hole of casing string and channel in cement-stone through guide shoe is erosion perforator with jet nozzle for formation of frontal cutting jets and thrust reactive jets. This provides for advance of perforator in frontal direction and withdrawal of washed rock into wellbore. If required, perforation is repeated in other direction and at other level. EFFECT: increased oil recovery from producing formation. 3 dwg, 3 ex