METHOD FOR REPAIR AND INSULATION WORK IN THE WELL Russian patent published in 2022 - IPC E21B33/138 C09K8/467 

FIELD: oil and gas production industry.

SUBSTANCE: invention relates to the oil and gas production industry, in particular to repair and insulation works in injection and production wells, and can be used for isolation of flushed zones and elimination of behind-the-casing flows. To implement the method for repair and insulation works in a well, a mixing fluid is preliminarily prepared by dissolving in fresh water in a given quantitative ratio of nitrilotrimethylphosphonic acid, a fluid loss reducer - a composition of synthetic sulfonated polymers with a bulk density of at least 0.5 g/cm³, a plasticizer - a composition of carboxylates and mixtures sodium salts of polymethylenenaphthalenesulfonic acids of various molecular weights with a bulk density of at least 0.4 g/cm³. The grouting slurry is prepared by simultaneously adding a mineral additive with Portland cement to the mixing liquid and mixing them for 20-30 minutes. As a mineral additive, Kalmatron-D, or Aquatron-12, or PenetronAdmix is used. The resulting cement slurry is pumped into the well.

EFFECT: improving the efficiency of repair and insulation work in the well by improving the strength of the stone, reducing the permeability over time while reducing labor intensity.

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