HYDROPHOBIC EMULSION FOR ISOLATION OF FORMATION WATER INFLOW INTO WELL Russian patent published in 1999 - IPC

FIELD: oil and gas production. SUBSTANCE: objective of invention is to make emulsion stable under high-temperature conditions in contact with formation waters with different mineralization and pH values and simultaneously increase selective isolation properties of emulsion. Emulsion of invention contains calcium chloride-type formation water with density 1060-1180 kg/cu. m and vat residue from C₁₇-C₂₀-amine production or product of polycondensation of this residue with vat residue from caprolactam production: 20-30% of hydrocarbon solution of amino-containing products: enamines, imines, and aminoalcohols with amino number at least 100 mg KOH/g, cyclohexanone and high-temperature cyclohexanone oxidation products. EFFECT: increased emulsion stability. 2 tbl