CONFORMANCE CONTROL METHOD FOR INJECTION WELLS

FIELD: oil industry, particularly enhanced recovery methods for obtaining hydrocarbons from reservoirs having low permeability. ^ SUBSTANCE: method involves serially injecting gel-forming composition and stimulating acid composition in formation, wherein acid composition pressure is higher than gel-...

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Bibliographische Detailangaben
Hauptverfasser:	GAEVOJ E.G, SILIN M.A, ZAJTSEV K.I, SKOROKHOD A.G, DZHABRAILOV A.V, KULIKOV A.N, AL'KHAMOV I.M, MAGADOV R.S, TROPIN EH.JU, TELIN A.G
Format:	Patent
Sprache:	eng ; rus
Schlagworte:	ADHESIVES CHEMISTRY DYES EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MINING MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PAINTS POLISHES
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Beschreibung
Zusammenfassung:	FIELD: oil industry, particularly enhanced recovery methods for obtaining hydrocarbons from reservoirs having low permeability. ^ SUBSTANCE: method involves serially injecting gel-forming composition and stimulating acid composition in formation, wherein acid composition pressure is higher than gel-forming composition pressure. To provide above pressure difference buffer liquid plug is injected between acid composition and gel-forming composition plugs. Above buffer liquid does not penetrate or negligibly penetrates into interlayers having low permeability. Acid composition is formed into well by aqueous surfactant solution. The buffer liquid is preferably liquid guar polysaccharide, which does not penetrate into above interlayers or reverse hydrocarbon emulsion, which slightly penetrated into said interlayers. Above gel-forming composition is cross-linked polymeric composition. Necessary ratios between injected plugs are determined during well treatment by performing injection pressure control. ^ EFFECT: increased efficiency. ^ 4 cl, 1 ex, 7 dwg