Method for improving oil-water displacement recovery ratio of low-permeable oil reservoir
The invention relates to a method for improving the oil-water displacement recovery ratio of a low-permeable oil reservoir, which comprises the following steps of: preparing a mixed aqueous solution containing 400-4000mg/L of surfactant and 200-2000mg/L of foam stabilizer from the surfactant, the fo...
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| creator | DU CHAOFENG GAO CHUNNING WANG LILI WU PINGCANG PANG SUISHE |
| description | The invention relates to a method for improving the oil-water displacement recovery ratio of a low-permeable oil reservoir, which comprises the following steps of: preparing a mixed aqueous solution containing 400-4000mg/L of surfactant and 200-2000mg/L of foam stabilizer from the surfactant, the foam stabilizer and water; and mixing the mixed aqueous solution and a gas according to a volume ratio of the solution to the gas of 1: (0.1-2), and injecting into the oil reservoir through a water injection well, wherein the injection time is 90-120 days. The surfactant is selected from one or two of branched sodium alkybenzenesulfonate, alkyl polyoxyethylene ether sodium sulfate, alkyl polyoxyethylene ether sodium carboxylate, fatty alcohol ether sodium sulfate and cocoamido propyl hydroxy sulfobetaine; the foam stabilizer is sodium carboxymethylcellulose; and the gas is air. According to the invention, after the water content of the extracted solution reaches 60 percent, the oil displacement efficiency is improved |
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The surfactant is selected from one or two of branched sodium alkybenzenesulfonate, alkyl polyoxyethylene ether sodium sulfate, alkyl polyoxyethylene ether sodium carboxylate, fatty alcohol ether sodium sulfate and cocoamido propyl hydroxy sulfobetaine; the foam stabilizer is sodium carboxymethylcellulose; and the gas is air. 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| language | chi ; eng |
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| subjects | 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 |
| title | Method for improving oil-water displacement recovery ratio of low-permeable oil reservoir |
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