BLOCKING HYDROPHOBIC-EMULSION COMPOSITION FOR KILLING OIL WELLS WITH HIGH CLAY CONTENT OF TERRIGENOUS RESERVOIR ROCKS Russian patent published in 2025 - IPC C09K8/42 

FIELD: obtaining oil from wells.

SUBSTANCE: invention relates to oil and gas industry, in particular to process fluids used during underground repair of wells at deposits with terrigenous type of reservoir, abnormally low formation pressure and high clay content. Blocking hydrophobic-emulsion composition for killing oil wells with high clay content of terrigenous reservoir rocks contains the following, wt.%: hydrocarbon phase – kerosene “TC”-1 6.1-12.2; mixture of product of reaction of amines and/or amino alcohols with fatty acids – emulsifier "Yalan-E2" grade “Б2” 0.7-1.1; mineralized water – 15 wt.% solution of NaCl or CaCl₂ – the rest.

EFFECT: increasing oil extraction from production wells with increased clay content due to creation of protective hydrophobic film on surface of pore channels of reservoir rock, which leads to reduction of contact of clay components with water phase of killing fluid and reduction of clay swelling degree.

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