METHOD OF PRODUCING GEL-FORMING COMPOSITION FOR ISOLATING WATER INFLOWS INTO WELL Russian patent published in 2024 - IPC C09K8/42 E21B33/138 E21B43/32 

FIELD: oil and gas industry.

SUBSTANCE: in the method of producing a gel-forming composition for isolating water influxes into a well, a first composition is prepared, which contains the following, wt.%: hydrolysed polyacrylonitrile 4.0–12.0; chromium acetate 1.0–3.0; fresh water—balance up to 100, and a second composition containing, wt.%: XC emulsifier 15.0–25.0; hydrocarbon solvent—commercial oil or diesel fuel—the rest up to 100. While stirring, the first composition is added to the second composition at a weight ratio of the first composition: the second composition equal to 3–4:1 and stirring is continued until the end product is obtained in the form of a homogeneous emulsion containing the following, wt.%: hydrolysed polyacrylonitrile 3.2–9.0; chromium acetate 0.8–2.3; XC emulsifier 3.0–6.3; said hydrocarbon solvent 17.0–18.7; fresh water—the rest up to 100.

EFFECT: providing a water-insulating screen after adsorption of surfactants in a porous medium and preventing precipitation gel formation upon contact with formation oil of a gel-forming composition obtained using the disclosed method.

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