METHOD OF TREATING RESERVOIR CONTAINING CARBONATE COMPONENT Russian patent published in 2001 - IPC

FIELD: oil production; applicable in treatment of oil formation of limestones, dolomites and sandstones containing carbonate component in the form of chalk, calcite, dolomite in inclusions or cementing material. SUBSTANCE: method consists in simultaneous injection of hydrochloric or acetic acid into formation through tubing and soda ash or sodium bicarbonate through annular space with their subsequent mixing in bottom-hole zone with production of carbonic acid dissolving carbonate component. EFFECT: increased depth of formation treatment, higher oil production rate, excluded corrosion of oil field equipment and simplified reservoir treatment process. 2 ex