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第 38 卷第 1 期 精 细 化 工 Vol.38, No.1
202 1 年 1 月 FINE CHEMICALS Jan. 2021
油田化学品与油品添加剂
纳米 SiO 增强 PAM/PEI 冻胶的制备及性能
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李 强,于小荣 ,肖 雪,罗 跃 ,杨 欢
(长江大学 化学与环境工程学院,湖北 荆州 434023)
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
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到 1.0×10 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
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7.0×10 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 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。
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
中图分类号:TQ314.2 文献标识码:A 文章编号:1003-5214 (2021) 01-0200-06
Preparation and properties of nanosilica-reinforced PAM/PEI gels
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LI Qiang, YU Xiaorong , XIAO Xue, LUO Yue , YANG Huan
(College of Chemical and Environmental Engineering, Yangtze University, Jingzhou 434023, Hubei, China)
Abstract: 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
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salinity of NaCl solution increased from 0 mg/L to 1.0×10 mg/L. Under the condition of 120 ℃, pH = 9,
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NaCl solution with salinity of 7.0×10 mg/L, C-SiO 2/PAM/PEI gel system had ultimate strength of grade H,
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apparent viscosity of about 6.0×10 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.
Key words: nanosilica-reinforced gel; polyethylenimine; polyacrylamide; profile control and water shutoff;
high-temperature resistance; salt resistance; stability; oil field chemicals
随着长期的注水开发,中国主力老油田已相继 现液流转向,改善吸水剖面和产液剖面,从而提高
进入高、特高含水阶段,油藏非均质性加剧、水窜 波及体积和采收率。
严重(含水 90%以上)、采收率低(不及 40%),进 国内外调研发现,在当前的调剖堵水体系中,
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一步挖潜空间大 。针对老油田的高含水问题,调 聚丙烯酰胺(PAM)类冻胶应用最为广泛 [2-4] 。目前,
3+
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剖堵水是有效的治理措施,通过封堵优势通道,实 常用的金属交联剂如 Cr 和 Al 等形成的离子键通
收稿日期:2020-05-25; 定用日期:2020-08-31; DOI: 10.13550/j.jxhg.20200430
基金项目:湖北省教育厅科学技术研究项目(Q20181309)
作者简介: 李 强(1996—),男,硕士生,E-mail: 1710688455@qq.com。联系人:于小荣(1988—),女,讲师,E-mail: yxr_cjdx@163.com;
罗 跃(1958—),男,教授,E-mail: lyue1958@163.com。