摘要
以十六烷基三甲基溴化铵改性SiO_(2)为增强剂构建C-SiO_(2)/聚丙烯酰胺(PAM)/聚乙烯亚胺(PEI)冻胶体系,模拟油藏环境对其抗温性、抗盐性、长期稳定性进行了考察。结果表明,C-SiO_(2)/PAM/PEI冻胶体系在酸性环境下不能成胶,当pH≥7时,C-SiO_(2)/PAM/PEI冻胶体系成胶时间缩短,强度增强。温度由30℃提高到120℃,成胶时间由20 h缩短为1 h,冻胶强度不断提高,在120℃下最终成胶强度可达到Ⅰ级。矿化度由0 mg/L上升到1.0×10^(5)mg/L,成胶时间从3 h延缓为5 d,成胶强度由Ⅰ级降为G级。在120℃下、pH为9、矿化度为7.0×10^(4)mg/L NaCl溶液中,C-SiO_(2)/PAM/PEI冻胶体系最终强度可达到H级,表观黏度可达6.0×10^(5)mPa·s左右,且维持360 d以上不脱水,具有良好的长期稳定性。结果表明,C-SiO_(2)本身的强度提高了冻胶体系的强度、耐温性和长期稳定性。
A C-SiO_(2)/polyacrylamide(PAM)/polyethylenimine(PEI)gel system was constructed using cetyltrimethylammonium bromide modified SiO_(2)(C-SiO_(2))as reinforcing agent,and its temperature resistance,salt resistance and long-term stability were investigated in simulated reservoir environment.The results showed that C-SiO_(2)/PAM/PEI could not form gel under acidic environment,while its gelation time decreased and gel strength increased at pH≥7.The gelation time reduced from 20 h to 1 h and the gel strength reached to grade I with the rising temperature from 30℃to 120℃.In addition,the gelation time of C-SiO_(2)/PAM/PEI was postponed from 3 h to 5 d and the gel strength reduced from grade I to G when the salinity of NaCl solution increased from 0 mg/L to 1.0×10^(5)mg/L.Under the condition of 120℃,pH=9,NaCl solution with salinity of 7.0×10^(4)mg/L,C-SiO_(2)/PAM/PEI gel system had ultimate strength of grade H,apparent viscosity of about 6.0×10^(5)mPa·s,and maintain more than 360 d without dehydration,with good long-term stability.The results showed that the strength of C-SiO_(2)itself improved the strength,temperature resistance and long-term stability of the gel system.
作者
李强
于小荣
肖雪
罗跃
杨欢
LI Qiang;YU Xiaorong;XIAO Xue;LUO Yue;YANG Huan(College of Chemical and Environmental Engineering,Yangtze University,Jingzhou 434023,Hubei,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2021年第1期200-205,共6页
Fine Chemicals
基金
湖北省教育厅科学技术研究项目(Q20181309)。
关键词
纳米增强冻胶
聚乙烯亚胺
聚丙烯酰胺
调剖堵水
抗温性
抗盐性
稳定性
油田化学品
nanosilica-reinforced gel
polyethylenimine
polyacrylamide
profile control and water shutoff
high-temperature resistance
salt resistance
stability
oil field chemicals
