Oil recovery process using arkyl aryl polyalkoxyol sulfonate surfactants as mobility control agents
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United States of America Patent
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Sep 10, 1991
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N/A
app pub date -
Jun 10, 1988
filing date -
Jun 10, 1988
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Expired
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Abstract
A method for recovering oil from a subterranean formation is disclosed wherein an aqueous surfactant solution is injected into the formation to reduce the mobility of gas in a gas-flooding process. The gas may include hydrocarbon gas, inert gas, carbon dioxide, and steam, or mixtures thereof. The surfactant is represented by the general formula ##STR1## where R is a linear or branched chain alkyl group with n carbon atoms wherein n ranges from about 6 to about 50, except that if the gas is steam n ranges from about 9 to about 50; Ar is a mononuclear or fused ring dinuclear aryl group; Z is an ionic group consisting of --SO.sub.3.sup.- M.sup.+ or --R'SO.sub.3.sup.- M.sup.+ wherein M.sup.+ is a cation and R' is a linear or branched chain alkyl group of from one to about six carbon atoms; x ranges from 0 to about 20; and y ranges from 3 to about 100.
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