OIL FORMATION TREATMENT EMULSION Russian patent published in 2005 - IPC

FIELD: oil and gas production.

SUBSTANCE: liquid hydrocarbon and water-based inert emulsion for treating oil formations stabilized by a mixture of oil-soluble and water-soluble nonionic surfactants is characterized by containing (i) as liquid hydrocarbon, 8.0-50.0% of high-pressure polyethylene production waste, notably spent oil "Orites", which is ethylene oxide/propylene oxide copolymer with 59% ethylene oxide units and which further comprises industrial oil; (ii) as oil-soluble surfactant, 2-5.0% of mixture of poly(oxyethylene glycol) ethers of synthetic primary higher fatty alcohol C₁₂-C₁₄-fraction expressed by general formula RO(CH₂CH₂O)_nH, wherein R resistance C₁₂-C₁₄-hydrocarbyl and n=3-3.5, having average molecular weight 326; and (iii) as water-soluble surfactant, 0.05-0.2% of mixture of poly(oxyethylene glycol) ethers of synthetic primary higher fatty alcohols of general formula C_nH_2n+1O(CH₂CH₂O)_mH, wherein n=12-14 and m=10, having average molecular weight 620-654.

EFFECT: increased oil recovery of formations with hard-recovered oil deposit and highly mineralized formation waters.

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