TECHNIQUE OF BOTTOM-HOLE TREATMENT OF POOL Russian patent published in 2003 - IPC

FIELD: oil production. SUBSTANCE: invention can be used to enhance filtration properties of bottom-hole of pool and productivity of production wells. It can also be employed in process of well repair and potentially in extraction, transportation and storage of oil. Technical result of invention lies in increased efficiency of treatment of bottom-hole pool, in provision for treatment of bottom- hole zones of deep wells, in stable productivity of wells for maximum long period without repeat resumption of their blockade. Technique of bottom-hole treatment of pool involves injection of dichloromethane or of its mixture with aromatic hydrocarbon and water-and-oil-soluble cation-active, surface active substance. Injection is executed by fringes with concentration of cation- active, surface active substance of 0.01-0.05 per cent by mass in first fringe, with concentration of above-mentioned substance of 0.2-0.5 per cent by mass in second fringe. One component, as minimum, from group of dialkyldimethylammoniumchloride, dialkylbenzylammoniumchloride, alkylthrimethylammoniumchloride is used in the capacity of cation-active, surface active substance. This mixture contains, per cent by mass: dichloromethane 30-70, aromatic hydrocarbon 30-70. Toluene, ethylbenzol fraction, concentrate of aromatic hydrocarbons C₉-C₁₀, dimethylbenzene are utilized as aromatic hydrocarbon. EFFECT: provision for stable production of wells for maximum long service period. 2 cl, 2 tbl