초록 ▼

Oil is extracted from subterranean reservoir rock formations by injection of a solution or dispersion of a carboxymethylated oxalkylate R－(OC3H6)m(OC2H4)nOCH2COOM in admixture with a more hydrophobic tenside, for example a mono- or dialkylbenzenesulfonate, a petroleum sulfonate or an alkanesulfonate

Oil is extracted from subterranean reservoir rock formations by injection of a solution or dispersion of a carboxymethylated oxalkylate R－(OC3H6)m(OC2H4)nOCH2COOM in admixture with a more hydrophobic tenside, for example a mono- or dialkylbenzenesulfonate, a petroleum sulfonate or an alkanesulfonate. The process is especially suited for reservoirs governed by strong temperature fluctuations or by a temperature gradient.

대표청구항 ▼

A process for recovering oil from a subterranean reservoir rock formation penetrated by at least one injection well and at least one production well, comprising injecting through said injecting well an aqueous solution or dispersion of effective amounts of (A) a tenside mixture of 0-90 wt% of ethoxy

A process for recovering oil from a subterranean reservoir rock formation penetrated by at least one injection well and at least one production well, comprising injecting through said injecting well an aqueous solution or dispersion of effective amounts of (A) a tenside mixture of 0-90 wt% of ethoxylates of the formula R－(OC3H6)m(OCH2CH2)nOH, and 10-100 wt% of carboxymethylated oxalkylates of the formula R－(OC3H6)m(OC2H4)nOCH2COOM wherein R is a hydrocarbon aliphatic group of 6-20 carbon atoms, a monoalkylaromatic group of 3-18 carbon atoms in the alkyl group or a di- or oligoalkylaromatic residue of 1-18 carbon atoms per alkyl group, the total number of carbon atoms in all the alkyl chains being 4 to 40, m is 0 to 20, n is 3 to 100, M is an alkali or alkaline earth metal ion or ammonium, and the aryl groups are of 6-10 carbon atoms, and (B) a sulfonate tenside which is more hydrophobic than said tenside mixture (A), and recovering said oil through said production well.