Multifunctional additive to cement slurries

摘要

The invention relates to a multi-purposes additive comprise of the combination of a high molecular weight water-soluble polymers useful to impart to an aqueous solution an increased viscosity and withstand hostile environment, a vegetable oil and an organophilic clay and that provides excellent fluid loss control, effective free fluid control, hence improved slurry stability, gas migration control, right angle set characteristics and viscosification of interstitial water. The invention also relates to cement slurries comprising the multi-purpose additive of the present invention.