ENHANCED OIL RECOVERY PROCESS TO INJECT LOW-SALINITY WATER ALTERNATING SURFACTANT-GAS IN OIL-WET CARBONATE RESERVOIRS
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United States of America Patent
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Jan 14, 2016
app pub date -
Mar 10, 2015
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Feb 19, 2014
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Abstract
The present invention relates to a method to enhance oil recovery from a hydrocarbon reservoir. One aspect of the invention includes injecting low-salinity water into the reservoir followed by the injection of a surfactant diluted in low-salinity water, and alternating the injections of the low-salinity water and the surfactant diluted in the low-salinity water. A gas is then injected into the reservoir. The invention improves the effectiveness of the surfactant and the gas by reducing the salinity of the reservoir by injecting low-salinity water into the reservoir.
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