Method for recovering oil from an underground deposit

Details Method for recovering oil from an underground deposit Method for recovering oil from an underground deposit

E - Fixed Constructions

21

B

31/16, 166/31

E21B 43/28 (2006.01) C09K 8/584 (2006.01)

Patent

CA 1159362

ABSTRACT OF THE DISCLOSURE The invention relates to a process for tertiary recovery of oil from underground deposits of average or high salinity. A surfactant which is a carboxymethylated oxyethylene compound of formula R-(OCH2CH2)n-OCH2-COOM in which R is an aliphatic or alkyl-aromatic group, n is a number between 3 and 30 and M is an alkali metal, alkaline earth metal or ammonium ion is injected in formation water into the deposit. The process is characterized in that the phase inversion temperature of a system composed of a crude oil, formation water and the surfactant is between 0 and 10°C higher than the temperature of the deposit and in that the oxyethylene surfactant is not fully carboxymethylated but has a degree of carboxymethylation between 10 and 90%.

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