Page 192 - 《精细化工》2022年第4期

第 39 卷第 4 期 精 细 化 工 Vol.39, No.4
2022 年 4 月 FINE CHEMICALS Apr. 2022

油田化学品与油品添加剂
双亲纳米 SiO 颗粒的制备及提高渗吸采收率性能
2

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白 云，蒲春生 ，刘 帅，樊 乔，张 超，陈泽宇
〔中国石油大学（华东） 石油工程学院，山东 青岛 266580〕

摘要：以正辛基三乙氧基硅烷和 3-巯基丙基三乙氧基硅烷为改性剂，以双氧水为氧化剂，在水基环境下对
亲水纳米 SiO 2 颗粒表面进行改性，得到具有磺酸基和辛基的双亲纳米 SiO 2 颗粒。通过 FTIR 和 TG 对其化
学结构和热稳定性进行了分析。将双亲纳米 SiO 2 颗粒分散在地层水中制备了纳米流体，对其稳定性、界面
性质和渗吸效率进行了评价。利用核磁共振技术探究纳米流体渗吸过程中岩心孔隙内原油运移规律。结果
表明，纳米流体储存 30 d 未出现分层现象，表现出良好的稳定性；经纳米流体处理的岩心亲水性增强。此
外，双亲纳米 SiO 2 颗粒（含量为 0.05%，以地层水质量为基准）将油水界面张力降低至 1.7 mN/m；纳米流体
渗吸采收率高达 22.6%，渗吸初始阶段小孔隙中的原油被动用，而在渗吸后期阶段大孔隙中的原油才被动用。
关键词：双亲纳米 SiO 2 颗粒；纳米流体；稳定性；界面性质；渗吸；油田化学品
中图分类号：TE357；TQ127.2 文献标识码：A 文章编号：1003-5214 (2022) 04-0828-09

Preparation and enhanced imbibition recovery factor performance

of amphiphilic nano-SiO 2 particles

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BAI Yun, PU Chunsheng , LIU Shuai, FAN Qiao, ZHANG Chao, CHEN Zeyu
（School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, Shandong, China）

Abstract: Hydrophilic nano-SiO 2 particles were modified using n-octyl triethoxysilane and 3-mercaptopropyl
triethoxysilane as modifiers and hydrogen peroxide as oxidant in a water-based environment to obtain
amphiphilic nano-SiO 2 particles containing sulfonic groups and octyl groups. The chemical structure and
thermal stability were analyzed by FTIR and TG. The amphiphilic nano-SiO 2 particles were dispersed in the
formation water to prepare nanofluid, and the stability, interface properties, and imbibition efficiency of
nanofluid were evaluated. The migration rule of crude oil in core pores during nanofluid imbibition was
explored by nuclear magnetic resonance technology. The results indicated that the nanofluid was stored for
30 d without delamination phenomenon and therefore exhibited good stability. The hydrophilicity of the
core treated with the nanofluid was enhanced. Furthermore, the amphiphilic nano-SiO 2 particles (content of
0.05%, based on the mass of formation water) could reduce the interfacial tension between oil and water to
1.7 mN/m. An imbibition recovery rate of up to 22.6% was achieved with the nanofluid. The crude oil in
small pores was discharged in the initial stage of imbibition, while that in large pores was discharged in the
later stage of imbibition.
Key words: amphiphilic nano-SiO 2 particles; nanofluid; stability; interface properties; imbibition; oil field
chemicals

[3]
随着常规油气产量的日益减少，致密油藏开发 重制约了致密油藏的开发效果 。目前，研究最多
[1]
力度逐年加大 。水力压裂是改造该类油藏的关键 的是使用表面活性剂提高致密油藏的渗吸采收率，
[2]
技术 。在压裂后的注水开发过程中，注入水难以 但由于用量大、成本高，表面活性剂不适合在油田
波及到基质孔隙内，导致渗吸采收率显著降低，严 开发中的大规模应用。

收稿日期：2021-09-22; 定用日期：2021-12-02; DOI: 10.13550/j.jxhg.20210955
基金项目：国家自然科学基金（51874339、51904320）
作者简介：白 云（1992—），女，博士生，E-mail：2453107878@qq.com。联系人：蒲春生（1959—），男，教授，E-mail：
chshpu_tx@126.com。