METHOD OF DEVELOPING AN OIL POOL CHARACTERIZED BY NONUNIFORMITY IN RESPECT TO PERMEABILITY AND OIL SATURATION Russian patent published in 1996 - IPC

FIELD: oil and gas production. SUBSTANCE: method consists in pumping in a reagent composition into the stratum through injection wells and withdrawal of oil from productive wells. Composition makeup is selected on condition of developing in drained part of stratum a lower dielectric constant than that in nondrained part, whereas volume of composition prevents its aggressive constituents from reaching the hole bottom. In conditions of West Siberia, employment of high- concentration hydrogen chloride is effective. EFFECT: increased oil production of bed and reduced association water withdrawal. 2 cl