METHOD FOR REPAIR AND INSULATION WORKS IN WELL Russian patent published in 2019 - IPC E21B33/14 C09K8/528 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry and can be used for repair and insulation works in wells for the elimination of interstratal flow of fluids, limiting water inflows and improving the efficiency of wells. According to the method, a working solution is prepared for pumping into an insulated interval with a concentration of (15.67–25.03) % density of (1031–1054) kg/m³. For this purpose, mix technical calcium oxide and industrial water. Get the milk of lime. Amount of milk of lime depends on the injectivity of the isolated interval. Annular space of the well is used as an insulated interval. After pumping, the working solution is bubbled with carbon dioxide up to formation of a carbonate crust on the outer surface of the column and a hardening effect due to mutual adhesion and coalescence of the formed submicrocrystalline calcium hydroxide particles. Required amount of carbon dioxide is determined stoichiometrically by a chemical equation.

EFFECT: technical result is an increase in the sealing properties of the composition to eliminate fluid flows downstream of the production columns in oil and gas wells, reducing the formation time of the tamping agent when filling the flow channels in the well.

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