一种新型弱酸性减阻降黏剂

合成聚合物由于抗高温、耐盐、功能多样化等特点，成为固井外加剂的主导材料，但由于其分子量大易导致体系黏稠度大，流变性难以调节，采用传统减阻剂作用较弱。针对此问题，根据微观结构设计，通过研选和合理复配，开发出了一种新型弱酸性减阻降黏剂，并对其进行了实验评价。评价结果表明，该减阻降黏剂可明显降低以合成聚合物为主剂的水泥浆体系的黏度，表观黏度降低率可达40%以上，显著改善水泥浆的流变性能，且对水泥浆稠化、强度等性能无不良影响，稠化时间之比为1.0～2.0，抗压强度之比不小于0.9，综合性能良好。 

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.