摘要
应用反相微乳液聚合制成了不同阳离子度聚丙烯酰胺微球(MPAM),通过黏度、浊度、Zeta电势分析,研究了微球阳离子度、电解质浓度(CE)对MPAM-HPAM复合体系聚沉规律的影响。实验结果表明,在临界聚沉盐浓度(Ccsc)时,复合体系由絮凝相转变为均匀分散体系,且Ccsc随着微球阳离子度增大而增加。当CE<Ccsc时,体系絮凝量随着CE增加而增大,随着HPAM剂量增加先增大后减小,在电中和点附近,絮凝量达最大,这一趋势与体系中微球Zeta电势变化相对应;当CE≥Ccsc时,微球对分子量为1 400×104的HPAM形成拟交联,可大幅提高体系黏度;这种均匀分散体系在蒸馏水稀释后,还能再次絮凝。
Polyacrylamide microspheres with different cationic degrees was synthesized using inversed microemulsion and effects of cationic degrees and electrolyte concentrations of microspheres on coagulation laws of a polyacrylamide microspheres and hydrolyzed polyacrylamide composite system was examined by means of viscometry, turbidimetry and the Zeta potential analysis. The experimental results show that the composite system evolves from a coagulation phase to a well-dispersed system at the critical coagulation salt content, which increases with the increase of cationic degrees of microspheres. When an electrolyte concentration is greater than a critical coagulation salt content, the coagulation volume of the system increases with the increase of electrolyte concentrations, mo- reover, it increases firstly then decreases with increasing the dose of hydrolyzed polyacrylamide. The coagulation volume of the system reaches to a maximum at the neutralization point of electron charge, which agrees well with the Zeta potential trend of micro- spheres of the system. When an electrolyte concentration is much greater than a critical coagulation salt content, the system viscosity of hydrolyzed polyacrylamide （14 million Dalton） increases strikingly due to a pseudo-crosslinking effect, but that of hydrolyzed polyacrylamide sharply drops down; especially when this evenly dispersed system is diluted with distilled water, coagulation can occur again.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2013年第6期1157-1162,共6页
Acta Petrolei Sinica
基金
国家自然科学基金青年科学基金项目(No.51104170)资助
关键词
阳离子微球
HPAM再利用
聚合物驱
提高采收率
临界聚沉盐浓度
cationic microspheres
hydrolyzed polyacrylamide reutilization
polymer flooding
enhanced oil recovery
critical coagulation salt content
