Enhanced oil recovery

Details Enhanced oil recovery Enhanced oil recovery

E - Fixed Constructions

21

B

31/31

E21B 43/22 (2006.01)

Patent

CA 1229973

"ENHANCED OIL RECOVERY" ABSTRACT The recovery of residual oil which is found in subterranean reservoirs may be accomplished by utilizing an aqueous surfactant slug to reduce the interfacial tension between oil and water. An ef- fective surfactant slug which may be used will comprise a mixture of: (1) from about 1 to about 10% of a sulfonate of a mixture of mono- and dialkyl-substituted aromatic hydrocarbon which has been obtained by the alkylation of an aromatic hydrocarbon with an olefinic hydro- carbon in the presence of a hydrogen fluoride catalyst; (2) a lower alkyl alcohol which possesses from about 3 to about 6 carbon atoms; and (3) a noionic cosurfactant comprising an ethoxylated n-alcohol which possesses from about 12 to about 15 carbon atoms.

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