SELF-HEALING PLUGGING MATERIAL Russian patent published in 2024 - IPC C09K8/467 

FIELD: chemistry.

SUBSTANCE: invention relates to compositions of plugging materials and can be used to prevent leakage of annular space of a well. Self-healing plugging material contains Portland cement PCT-1-50, water-swelling particles, microsilica and water at the following ratio of the mixture of components, wt. %: water-swelling particles 0.9–1.2; portland cement grade PCT-1-50 87.8–90.1; microsilica – balance up to 100 wt. %, to which water is added in water-cement ratio of water : portland cement PCT-1-50 1:2. Water-swellable particles used are LP-6S water-swellable polymer particles coated with a water-soluble polyethylene glycol shell with molecular weight of 6,000 g/mol PEG-6000, obtained from dried in an oven for at least 4 hours at a temperature of at least 60 °C and broken down to particles an emulsion containing, wt. %: PEG-6000 49.25–49.75; water-swellable polymer LP-6S 0.9–1.2; water – the rest.

EFFECT: restoration of integrity of cement stone.

1 cl, 1 dwg, 3 tbl, 31 ex