E - Fixed Constructions – 21 – B
Patent
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.
422855
Balzer Dieter
Kosswig Kurt
Chemische Werke Huls Aktiengesellschaft
Degussa-Huls Aktiengesellschaft
Fetherstonhaugh & Co.
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