聚羧酸超塑化剂与纳米SiO2颗粒协同作用对固井水泥浆性能的影响  

Synergistic Effect of Polycarboxylic Acid Superplasticizer and SiO 2 Nanoparticles on Performance of Cementing Slurry

作　　者：李延伟 LI Yanwei(Cementing Technology Service Center of Sinopec Shengli Petroleum Engineering Co.,Ltd.,Dongying 257000,China)

机构地区：[1]中石化胜利石油工程有限公司固井技术服务中心,东营257000

出　　处：《硅酸盐通报》2020年第10期3121-3125,共5页Bulletin of the Chinese Ceramic Society

基　　金：中石化胜利石油工程有限公司重点科技攻关项目(SKG1906)。

摘　　要：以丙烯酸(AA)和聚乙二醇甲基丙烯酸甲酯(PEGMA)为单体,采用自由基聚合制备AA/PEGMA聚羧酸超塑化剂,并研究其与纳米SiO 2颗粒协同作用对固井水泥浆的水化过程、微观结构、流变行为和力学性能的影响。采用红外光谱仪(IR)、核磁共振仪(NMR)、热重分析仪(TG)、扫描电镜(SEM)、流变仪和抗压强度分析仪分别对AA/PEGMA的分子结构、水泥浆的水化产物含量、微观形貌、流变行为和抗压强度进行表征分析。结果表明,AA/PEGMA与纳米SiO 2颗粒的协同作用能够显著促进水泥浆水化,降低Ca(OH)2含量,提高流动性(屈服应力降至约0.01 Pa),并使水泥石的微观结构致密化,力学性能明显增强,抗压强度提高43.6%。AA/PEGMA polycarboxylic acid superplasticizer was prepared by free radical polymerization of acrylic acid(AA)and polyethylene glycol methyl methacrylate(PEGMA)as monomers.And the influences of the synergistic effect between AA/PEGMA polycarboxylic acid superplasticizer and SiO 2 nanoparticles on the hydration process,microstructure,rheological behavior and mechanical properties of cementing slurry were studied.The molecular structure of AA/PEGMA polycarboxylic acid superplasticizer,hydration product content of cement slurry,microscopic morphology,rheological behavior,and compressive strength were analyzed by infrared spectrometer(IR),nuclear magnetic resonance spectrometer(NMR),thermal gravimetric analyzer(TG),scanning electron microscope(SEM),rheometer and compressive strength analyzers,respectively.The results show that the synergistic effect of AA/PEGMA polycarboxylic acid superplasticizer and SiO 2 nanoparticles significantly promotes the hydration of cement slurry,reduces the content of Ca(OH)2,increases the fluidity(yield stress decreases to about 0.01 Pa),and enhances the microstructure densification and mechanical properties of cement stone,and increases the compressive strength by 43.6%.

关 键 词：固井水泥浆 聚羧酸超塑化剂 纳米SiO 2颗粒 协同作用 

分 类 号：TE256[石油与天然气工程—油气井工程]