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

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

Patent

CA 1199783

ABSTRACT A method for recovering largely emulsion-free oil from an underground deposit of medium or high salinity by injecting, into an injection bore-hole, a 0.1 to 30% solution or dispersion, in formation- or flood-water, of carboxymethylated oxethylates of the formula: R - (OCH2CH2)n - OCH2 - COOM, wherein R signifies a linear or branched aliphatic residue with 6 to 20 carbon atoms or an alkyl- or dialkyl-aromatic residue with 3 to 16 carbon atoms in the alkyl group, M signifies an alkali or alkaline-earth metal ion or ammonium ion, n lies between 1 and 3 and the degree of carboxymethylation between 10 and 90%, the surfactant selected being such that the phase-inversion temperature of the crude-oil/formation- or flood-water/surfactant/possible additives system lies at 0 to 10°C above the temperature of the deposit. The method sharply reduces pressure gradients developing during transportation of the oil through the formation.

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