BACKFILL COMPOUND Russian patent published in 2021 - IPC C09K8/467 C04B28/04 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, in particular to backfill mixtures intended for cementing oil, gas, hydrogeological and geothermal wells that cover the intervals of permeable layers at normal, moderate and high temperatures. The backfill composition includes Portland cement PCT-I-50, carbon black, plasticizing additive and water. As a plasticizing additive, PVA-M “Extra” glue or a “Universal” deep penetration primer 2-in-1 is used.

EFFECT: claimed backfill mixture will improve quality of cementing casing strings and durability of wells in normal, moderate and high temperatures.

3 cl, 2 tbl