EMULSIFIER-STABILIZER FOR INVERT EMULSIONS AND A METHOD FOR PREPARING ACTIVE BASE THEREOF Russian patent published in 2008 - IPC B01F17/14 B01F17/22 C09K8/35 B01F3/08 B01F17/34 

FIELD: oil and gas production.

SUBSTANCE: invention relates to preparation of invert emulsions used as processing fluids for drilling and during major repairs of oil and gas wells. Emulsifier-stabilizer is composed of oil-soluble surfactant, hydrocarbon solvent, and glycerol. Oil-soluble surfactant is represented by Ca-phosphatidine, which reaction product of vegetable oil fatty acids (phosphatidine concentrate) and monoethanolamine or diethanolamine and complexing agent, weight percentages of components being as follows: Ca-phosphatidine 10.0-30.0%, glycerol 0.5-2.5%, and hydrocarbon solvent to 100%. Preferably, hydrocarbon solvent is arctic diesel fuel, aviation kerosene (TS-1), petroleum fraction (NBO-80), transformer oil (VG), oil MS-20 or their mixtures. Active base of emulsifier-stabilizer (Ca-phosphatidine) is prepared by heating and stirring for 3-4 h mixture of above fatty acids, monoethanolamine or diethanolamine and complexing agent at weight ratio 1:(2-3):(0.4-1.0), respectively, at temperature 90-110°C.

EFFECT: increased emulsifying and stabilizing ability and heat resistance at lowered filtration loss of invert emulsions, and increased economical efficiency of process.

3 cl, 2 tbl, 10 ex