纳米二氧化硅分散方式对固井水泥浆性能影响研究  

作　　者：余杨 黄文 姚广 张坤悦 沈鑫 孙明明 王世兰 吴林钰 

机构地区：[1]中国建筑材料科学研究总院有限公司,北京100024 [2]西南科技大学材料与化学学院,四川绵阳621000

出　　处：《中国水泥》2024年第3期93-97,共5页China Cement

摘　　要：结合实际固井作业的特点,分析干法分散、高速湿法分散与超声波湿法分散三种不同分散方式条件下纳米二氧化硅对固井水泥浆流动度和水泥石抗压强度、孔隙度、渗透率等性能的影响,利用扫描电镜(SEM)分析不同分散方式对水泥石微观结构的影响。结果表明:分散方式对纳米二氧化硅改性固井水泥浆的效能有着重要的影响,且随着纳米二氧化硅掺量越高,分散方式的影响越明显。当纳米二氧化硅掺量达到1.5%时,采用超声波湿法分散方式制备的水泥浆流动度仍有20cm,水泥石的3d、7d和14d抗压强度分别提高了18.75%、16.53%和12.26%,孔隙度和渗透率分别降低了19.6%和34.9%,内部微观结构变得致密。Based on the characteristics of on-site cementing operation,the influences of dry dispersion way,high-speed wet dispersion way,and ultrasonic wet dispersion way on the properties of nano-silica modified oil well cement,including fluidity and compressive strength,porosity and permeability,were analyzed in this paper.Then,the effect of different dispersion ways on the microstructure of cement paste was analyzed by scanning electron microscopy(SEM).The results show that the mixing way has an important influence on the performance of nano-silica modified cementing slurry.Furthermore,the higher the dosage of nano silica,the more obvious the influence of dispersion method.Even the nano-silica dosage reached 1.5%,the fluidity of cement slurry prepared by ultrasonic wet dispersion way still has 20cm.In addition,the compressive strengths of cement paste in 3 days,7 days and 14 days were increased by 18.75%,16.53%and 12.26%respectively,the porosity and permeability were decreased by 19.6%and 34.9%respectively,and the internal microstructure became denser.This study can provide a useful reference for the application of nano-silica and other nanomaterials in cementing engineering.

关 键 词：固井水泥浆 纳米二氧化硅 分散方式 超声波分散 

分 类 号：TQ172.43[化学工程—水泥工业]