METHOD OF MULTICYCLE PULSE STIMULATION OF FORMATION WITH CLEANING OF BOTTOM-HOLE FORMATION ZONE Russian patent published in 1999 - IPC

FIELD: oil production. SUBSTANCE: method includes lowering on cable into well of depression chamber, stimulation of formation with alternation of pulses of differential pressure and repressuring with instantaneous opening of chamber inlet valve. Value of the first differential pressure pulse is selected equal to 30-45% of hydrostatic pressure value by regulation of hydraulic resistance of inlet valve. Under this differential pressure, well fluid is not degassed. Value of next pulse of differential pressure exceeds the value of the first differential pressure pulse by 10-40%. Depression chamber may be used in for of tubing. Up to 15-20 differential pressure-repressuring cycles of damped vibrations are provided for loosening plugs clogging filtrating channels. Conditions are provided for betted cleaning of bottom-hole formation zone by flow of well fluid to chamber with its subsequent lowering into well. EFFECT: increased oil recovery of formation intake rate. 1 dwg