preflush meaning in English

前置液

The application procedure of preflush for well cementing
油气井注水泥前置液使用方法
Then it gives some suggestion on the determination of operation discharge and preflush rate and some technical problems in operation
通过实际施工资料的统计，对施工排量和前置液量的确定等施工中需要改进的技术问题，提出了建议。
The study results indicated that , arranged in the order of magnitude , the degrees of the effects on the cementing strengths of the two interfaces were the system , emulsion , main emulsifier , fluid loss control agent and white oil respectively ; the cementing strength would be doubled and redoubled after being cleaned by preflush , especially by the system , emulsion and fluid loss control agent ; and , along with the increase in the mix slurry ratio , the initial and final set times of slurry would be obviously lengthened and the compressive strength of bond cement would be remarkably reduced or the slurry wouldn ' t be even set
研究表明：对两界面胶结强度的影响由大到小依次是体系、乳状液、主乳化剂、降滤失剂、白油；前置液清洗后，胶结强度成倍提高，尤其对体系、乳状液和降滤失剂清洗效果最佳；随混浆比的增大，水泥浆初凝和终凝时间明显延长，水泥石抗压强度明显下降，甚至不凝。