CEMENT SLURRY FOR THE OIL AND GAS WELLS CEMENTING Russian patent published in 2019 - IPC C09K8/467 E21B33/138 C04B28/04 C04B24/04 C04B24/18 C04B111/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the used in the oil and gas wells cementing cement slurries. Oil and gas wells cementing cement slurry, containing Portland cement, adhesive additive, water loss reducer, defoamer and water, as an adhesive additive contains the Silor-Ultra T glue, as the water loss reducer is the water-soluble cellulose ether, the carboxymethylcellulose, as the plasticizer is the lignosulfonate, as the defoamer, the tributyl phosphate is used in the following ratio of components, wt. %: Portland cement – 100, the said adhesive additive is 1.0–2.0 in excess of 100, the specified loss of water loss is 0.01–0.1 in excess of 100, said plasticizer is 0.05–0.15 in excess of 100, tributyl phosphate is 0.05–0.1 in excess of 100, water to water-cement ratio is 0.36–0.38.

EFFECT: technical result is increase in the cement stone impact resistance and adhesive properties.

1 cl, 1 tbl