Process for oil recovery from subterranean reservoir rock...

Details Process for oil recovery from subterranean reservoir rock... Process for oil recovery from subterranean reservoir rock...

E - Fixed Constructions

21

B

31/24

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

Patent

CA 1262821

ABSTRACT A process is disclosed for extraction of oil from subterranean reservoir rock formations by injection of a solution or dispersion of a carboxymethylated ethoxylate R-(OC3H6)m(OC2H4)nOCH2COOM in a mixture with a more hydrophobic tenside, for example a mono- or dialkylbenzenesulfonate, a petroleum sulfonate or alkanesulfonate. The process is especially suited for reservoirs governed by strong temperature fluctuations or by a temperature gradient.

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