CEMENT GROUTING SYSTEM, METHOD OF OBTAINING AND USE THEREOF Russian patent published in 2024 - IPC C09K8/467 C04B22/08 C04B24/38 C04B28/00 E21B33/138 

FIELD: oil, gas and coke-chemical industry.

SUBSTANCE: group of inventions relates to the field of oil and gas deposits operation, in particular to the early strength material, suitable for the cement grouting system, cement mortar composition, a cement mortar system, a method for production thereof and use thereof. Mortar system obtained from the mortar composition contains 100 parts by weight of cement, 1–5 parts by weight of early strength material, 0.5–40 weight parts of strength stabilizer, 45–120 weight parts of density modifier. In addition, system contains 1–2 parts by weight of a suspension stabilizer, 0.9–2 parts by weight of a dispersing agent II, 2–5 parts by weight of a filtration reducer, 0.1–2 parts by weight of a retarder, 0.1–0.5 parts by weight antifoaming agent and 40-80 parts by weight of water. Early strength material contains an aluminum salt, a sodium salt, a whisker, an inorganic mineral and a dispersing agent I. Weight ratio of aluminum salt, sodium salt, whisker, inorganic mineral and dispersing agent I is (1–3):(1–3):(1–4):(1–8):1. Method of producing the system includes subjecting cement, early strength material, strength stabilizer, density modifier, suspension stabilizer and dispersing agent II to first mixing to produce a dry mixture. Filtration reducer, retarder, antifoaming agent and water are subjected to second mixing to obtain a wet mixture. Dry mixture is added to the wet mixture while stirring at low speed. Then the obtained mixture is mixed at high speed to obtain a system of cement mortar. Said system of cement mortar is used in high-temperature cementing of deep wells and cementing of long insulation sections under conditions of high temperature difference.

EFFECT: increased efficiency of well cementing, prolonged time of cement slurry thickening in conditions of high temperature, prevention of superdeceleration of upper layer of cement slurry under conditions of low temperature and increased early strength.

16 cl, 2 dwg, 1 tbl