REAGENT-ADDITIVE TO LIQUID FOR KILLING OF WELL Russian patent published in 2010 - IPC C09K8/42 

FIELD: oil-and-gas production.

SUBSTANCE: reagent-additive contains cation surface active agent - quaternary ammonium compound, described by following common structure formula:

where R₁ - alkyl C₈-C₁₈, R₂ - CH₃, -C₂H₅R₃ - Cl, or Br, or -SO₄CH₃, herewith reagent-additive contains mixture of quaternary ammonium compounds with following chemical composition and with following its quantitative content in mixture, wt %: compound (I) with R₁-C₈H₁₅ 0.1-10, compound (I) with R₁-C₁₀H₂₁ 1-20, compound (I) with R₁-C₁₂H₂₃ 30-70, compound (I) with R₁-C₁₄H₂₇ 5-30, compound (I) with R₁-C₁₆H₃₁ 1-20, compound (I) with R₁-C₁₈H₃₅ - 0.1-5.

EFFECT: at addition of regent into salt-mineral solutions there is provided its good water-repellent and demulsifying abilities, low interfacial tension, stability of solutions to salting out and coagulation.

2 tbl, 1 ex