METHOD OF FORMATION PRODUCING ZONE TREATMENT Russian patent published in 2002 - IPC

FIELD: oil and gas producing industry; applicable in treatment of formation producing zone for intensification of inflow of formation fluid to well. SUBSTANCE: method includes sealing of casing string - borehole annular space, washing of bottom-hole zone to remove asphalt-resinous and paraffin accumulations by injection of solvent into formation, cyclic injection of portions of solution of acid and hydrocarbon fluid, allowing to stand for period of reaction completion. After injection of solvent of asphalt-resinous and paraffin accumulations, water is injected into formation under pressure of opening of fractures and in volume equaling at least volume of well. Then portions of the same volumes of solution of acid and hydrocarbon fluid are successively injected into formation. They are forced together with reaction products into formation depth with water in volume equaling at least total volume of all portions of hydrocarbon fluid and acid solution. Well is allowed to stand for period of gravitation replacement of formation fluid with acid solution and water. Then during whole day, pressure is smoothly reduced at wellhead of sealed well with the help of throttling device. After that, well is put into operation. EFFECT: increased well productivity, and prevention of pollution of environment. 4 cl, 1 ex