Method for recovering oil from subterranean deposits by...

Details Method for recovering oil from subterranean deposits by... Method for recovering oil from subterranean deposits by...

E - Fixed Constructions

21

B

31/16

E21B 43/22 (2006.01) C09K 8/584 (2006.01)

Patent

CA 1179115

A B S T R A C T Recovery of largely emulsion-free oil, from a subterranean deposit of average or high salinity is disclosed. The method involves injecting an emulsion into an injection borehole, carboxy-methylated oxethylate being used as the emulsifier and being employed in such a manner that the phase- inversion-temperature of the system comprising deposit oil/formation water/ surfactant/possible additives, is from 0 to 10°C above the temperature of the deposit.

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