METHOD OF OIL DEPOSIT DEVELOPMENT Russian patent published in 2002 - IPC

FIELD: oil and gas producing industry, particularly, increase of injectivity of injection wells due to physico-chemical treatment of bottom-hole formation zone. SUBSTANCE: method includes injection into well of suspension in organi c solvent of chemically modified silica, forcing of suspension by displacing fluid. The following ingredients are used in said suspension, wt. %: hydrophobic silica with 98.0-99.5% of hydrophoby, 0.08-0.15; diphillic silica with 40-60% of hydrophoby, 0.02-0.10; and additionally, cationic surfactant, 0.1-0.3. Obtained suspension is injected through dispergator to bottom-hole formation zone. Displacing fluid is used in the form of water. After forcing of suspension into bottom-hole formation zone well without letting it to stand is connected to system for formation pressure maintenance. Cationic surfactant is used in the form of quaternary ammonium or phosphonic bases, tertiary sulphonic bases. Silica is used in the form of aerosil, white black, filter perlite, talc and other amorphous silicas with discrete particles sizing from 0.005 to 0.1 mcm. Organic solvent is used in the form of wide fraction of light hydrocarboncs, nefras, natural gasoline, diesel fuel. EFFECT: higher injectivity of injection wells at the same or lower injection pressure, and increased duration of treatment effect. 4 cl, 2 tbl, 3 ex