Alkali-enhanced steam foam oil recovery process

Details Alkali-enhanced steam foam oil recovery process Alkali-enhanced steam foam oil recovery process

E - Fixed Constructions

21

B

31/14

E21B 43/24 (2006.01) C09K 8/592 (2006.01)

Patent

CA 1259476

A B S T R A C T ALKALI-ENHANCED STEAM FOAM OIL RECOVERY PROCESS In a continuous or cyclic steam foam drive, recovery of an acidic reservoir oil is improved by injecting steam accompanied by (a) enough dissolved alkaline monovalent salt to ion-exchange multivalent cations from the reservoir rocks and precipitate those ions in compounds which are insoluble in an alkaline aqueous liquid as well as forming soaps of the reservoir oil acids and (b) surfactants for foaming the steam and increasing the salt tolerance of an aqueous surfactant system containing the soaps of the reservoir oil acids.

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