IMPROVED INVERT EMULSIFIER FOR USE IN DRILLING MUDS WITH INVERT EMULSION Russian patent published in 2022 - IPC C09K8/36 

FIELD: chemistry.

SUBSTANCE: inventions relate to invert emulsifiers and to their use. An invert emulsifier based on zwitter-ion imidazoline for use in drilling muds with an invert emulsion is described, having the formula

where a) R₁ is an alkyl radical, which is a fatty acid derivative; b) R₂ is polyalkylene polyamine, NH₂, NHCOR₁, OH, OCOR₁; and c) R₃ is an alkanediyl radical, which is a derivative of unsaturated monobasic carboxylic acid containing 3-8 carbon atoms. Salt of the invert emulsifier based on zwitter-ion imidazoline is described, which is a derivative of a reaction of the above-described invert emulsifier and calcium hydroxide, or calcium oxide, or magnesium hydroxide as compounds for neutralization of the emulsifier. Drilling mud with an invert emulsion is described, containing a hydrocarbon dispersion medium; a dispersion phase of an aqueous salt solution; an alkaline agent, and the above-described invert emulsifier based on zwitter-ion imidazoline.

EFFECT: increase in the stability of drilling mud at elevated temperatures and improvement of characteristics of mud.

18 cl, 11 tbl, 5 ex