ACTIVATORS FOR HARDENING CEMENT FOR CEMENT COMPOSITIONS WITH DISABLED HARDENING AND RELATED METHODS Russian patent published in 2017 - IPC E21B33/13 C09K8/46 C04B22/08 C04B24/26 C04B103/32 C04B103/12 C04B103/22 

FIELD: chemistry.

SUBSTANCE: method of cementing includes supply of cement compositions with delayed setting that contains water, pumice, hydrated lime and retarder, activation of cement compositions with delayed hardening liquid additive for getting activated cement composition, where liquid supplement contains monovalent salt, polyphosphate, dispersant and water, and where monovalent salt is present in liquid additive in an amount of 0.1% to 30 wt % of the liquid additive. Polyphosphate is present in the liquid additive in an amount of 0.1% to 30 wt % of the liquid additive. The dispersant is present in the liquid additive in an amount of 0.1% to 90 wt % of the liquid additive, and water is present in the liquid additive in an amount of 50% to 90 wt % of the liquid additive; and allowing the activated cement composition to harden. The invention also relates to an activated cement composition comprising water, pumice, hydrated lime, retarder, a liquid additive for activating the activated cement composition, wherein the liquid additive contains monovalent salt, polyphosphate, dispersant and water, and where monovalent salt is present in the liquid additive in an amount of 0.1% to 30 wt % of the liquid additive. Polyphosphate is present in the liquid additive in an amount of 0.1% to 30 wt % of the liquid additive. The dispersant is present in the liquid additive in an amount of 0.1% to 90 wt % of the liquid additive, and water is present in the liquid additive in an amount of 50% to 90 wt % of the liquid additive. The invention also relates to a system for cementing.

EFFECT: increasing the efficiency of the cementing method, including when used in subterranean formations with lower bottom hole temperatures.

19 cl, 4 dwg, 20 tbl