METHOD OF INTENSIFYING OIL PRODUCTION Russian patent published in 1997 - IPC

FIELD: oil and gas production. SUBSTANCE: reagent, in particular, aqueous solution of multifunctional surfactant composition, is pumped in into borehole. Bottom zone is subjected to pulse treatment all over the depth of bed using electric discharges in reagent medium while continuously displacing electric- discharge machine in upward direction. Treatment consists in at least three identical successive cycles in on-off mode. Pulse frequency and velocity of discharge machine displacement are chosen in dependence on actual porosity of drilled bed and taking into consideration, preliminarily found on core material, empirical relationship between number of electric discharge pulses per 1 m of bed and mineral porosity. Pause time in each cycle is accepted to be at least 30 min. Such system treatment of bed allows considerably increasing depth of bed stimulation so restoring and, in some cases, improving collector property of bed. EFFECT: intensified oil production. 1 dwg