Fluorosurfactant extraction process for carbonate reservoirs
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United States of America Patent
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Mar 20, 2018
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Apr 21, 2017
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Mar 30, 2015
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Abstract
A process for recovering oil from a carbonate reservoir of high salinity, wherein supercritical CO2 floodings are combined with a fluorosurfactant in the tertiary recovery. Embodiments include alternating injection and co-injection schemes of the supercritical CO2 and the fluorosurfactant. A stable fluorosurfactant-CO2 foam that is not susceptible to the harsh conditions of the reservoir (temperature, pressure and salinity) can be successfully generated, leading to a reduction in the mobility of CO2, an increase in the mobility of the reservoir oil, higher contact between the injected fluid with the oil and a better sweep efficiency of the oil.
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