A New Weakly Acidic Drag Reducing Viscosity Reducer

Synthetic polymers, because of their high temperature resistance, high salt-resistance and versatility, have long been the leading material of cement additives. Cement slurries treated with high molecular weight polymers generally have high consistency and their rheology is difficult to adjust. Conventional drag reducers are unable to deal with this high rheology effectively. To solve this problem, a new weakly acidic drag reducing viscosity reducer was developed based on microstructure design and selection and compounding of raw materials. Laboratory evaluation of the drag reducing viscosity reducer showed that it can significantly reduce the viscosity of cement slurries treated with synthetic polymers as the main additives; the percent reduction of the apparent viscosity was at least 40%, significantly improving the rheology of cement slurries and imposing no negative effects on the thickening and strength development of cement slurries. Cement slurries treated with the viscosity reducer have ratios of thickening time of 1.0-2.0, and ratios of compressive strengths at least 0.9, demonstrating good general performance.