Page 210 - 《精细化工》2021年第1期
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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
                                     2


                                                                            *
                                                     *
                                 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
                         5
                 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
                                                                                             5
                      4
                 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

                                                      *
                                                                           *
                                 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
                                                                 5
                 salinity of NaCl solution increased from 0 mg/L to 1.0×10  mg/L. Under the condition of 120  ℃, pH = 9,
                                               4
                 NaCl solution with salinity of 7.0×10  mg/L, C-SiO 2/PAM/PEI gel system had ultimate strength of grade H,
                                             5
                 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,
                           [1]
            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+
                                                                                           3+
            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。
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