C-branched zwitterionic surfactants and enhanced oil recovery method using same
AssigneeThe Standard Oil Company
InventorsRoman Loza, Roseann M. Cyngier
Life of this patent
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Abstract
A C-branched zwitterionic surfactant represented by the following formula is disclosed: ##STR1## wherein x and y are numbers, x is less than or equal to y+1, and the sum of x+y in the range of about 7 to about 19, with the provisos that: (1) when the sum of x+y is in the range of about 7 to about 13, x/y is in the range of about 0.3 to about 1.2; and (2) when the sum of x+y is in the range of about 14 to about 19, x/y is in the range of about 0.1 to about 0.7. An enhanced oil recovery method using the foregoing surfactants is also disclosed.
Claims5
A compound represented by formula ##STR13## wherein x is in the range of about 3 to about 5 and y is in the range of about 10 to about 12, x is less than or equal to y+1, and the sum of x+y is in the range of about 7 to about 19, with the provisos that:
- (1) when the sum of x+y is in the range of about 7 to about 13, x/y is in the range of about 0.3 to about 1.2;
- and (2) when the sum of x+y is in the range of about 14 to about 19, x/y is in the range of about 0.1 to about 0.7.
3-[N,N-dimethyl(2-butyl)hexadecylammonio]-2-hydroxy-1-propane sulfonate.
3-[N,N-dimethyl(2-hexyl)tetradecylammonio]-2-hydroxy-1-propane sulfonate.
Dependencies are inferred from the claim text.