COMPOSITION FOR KILLING OIL WELLS AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2025 - IPC C09K8/42 E21B43/12 

FIELD: obtaining oil from wells.

SUBSTANCE: group of inventions relates to oil industry, namely to killing of oil wells. composition for killing oil wells contains the following, wt.%: emulsion-liquid base 40-50; saturating binary salts 50-60. Emulsion-liquid base contains a mixture containing, vol.% of the mixture volume: hydrocarbon liquid from the row: mixture of aromatic hydrocarbons, diesel fuel, kerosene, 40-50; zwitterionic surfactant from: oleylamidopropyl betaine, oleylamidopropyl dimethiamine, 1-2; fresh process water 46-57; foaming agent, resistant to mineralized liquid, 2, and xanthan gum (C₃₅H₄₉O₂₉)_n as an emulsion stabilizer up to 1 wt.% of the weight of said mixture, which includes a hydrocarbon liquid, a surfactant, fresh process water and a foaming agent. Hydrocarbon liquid is selected from: mixture of aromatic hydrocarbons, diesel fuel, kerosene. saturating binary salts include, wt.% from the mass of saturating binary salts: sodium nitrite 79; carbonic acid diamide 19; ammonium chloride as clay stabilizer 2.

EFFECT: increased rate of productivity recovery after killing, complete recovery of productivity after killing, formation of stable foam.

2 cl, 5 dwg, 6 ex