METHOD FOR PREPARING A LIGHTENED CEMENTING SOLUTION Russian patent published in 2004 - IPC

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes mixing of cementing cement with micro-spheres and mixing with liquid, previously a dry powder-like polymer water output reducer is mixed with micro-spheres with following relation to weight of cementing cement in percents of mass: micro-spheres 10-45, water output reducer - 0.15-0.45, mixture of these admixtures is mixed with said cement and then mixed with liquid - previously prepared 0.02-0.08% solution of foam suppressant tributylphosphate with water-hard relation 0.6-0.85. As dry powder like polymer water output reducers sulphocell, camcell, oxyethylcellulose, polyvinyl spirits, polyacrylamide are used.

EFFECT: low density - up to 1200 kg/m³, low density oscillations during mixing - ±20 kg/m³, lower bed repression, prevented absorption of cementing solution, assured rise of cement to projected height.

1 ex, 2 cl