Phosphorus containing ester cosurfactants in enhanced oil recove

Wells – Processes – Distinct – separate injection and producing wells

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166274, 252 855D, 252353, E21B 4322

Patent

active

044806922

ABSTRACT:
A surfactant system useful for oil recovery consisting essentially of a surfactant, such as a petroleum sulfonate, and at least one cosurfactant selected from the group consisting of a phosphate ester of the formula: ##STR1## and a phosphite ester represented by the formula ##STR2## and a phosphonate ester represented by the formula ##STR3## wherein R is either a methyl, ethyl or propyl group.

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