PLUGGING MATERIAL Russian patent published in 2020 - IPC C09K8/467 C09K8/00 E21B33/138 

FIELD: mining.

SUBSTANCE: invention relates to plugging materials used in cementing oil and gas wells, mainly to special binding materials for fixing wells in hydrogen sulphide-containing media. Plugging material, including portland cement and additive, according to the invention, as additive contains calcium polysulphide subjected to combined disintegration treatment with portland cement at a collision rate of 95–110 m/s, with the following ratio, wt%: portland cement 95–99, calcium polysulphide 1–5.

EFFECT: obtaining the composition of plugging material ensuring durability of cement stone in hydrogen sulphide-containing media and having low permeability.

1 cl, 2 tbl