Zhao Fang-Jian, Yuan Fu-Qing, Pan Bin-Lin, Xu Zhi-Cheng, Gong Qing-Tao, Zhang Lei, Hou Jian, Zhang Lu
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao City, Shandong Province 266580, China.
Exploration and Development Research Institute, Sheng Li Oilfield Company, SINOPEC, Dongying City, Shandong Province 257015, China.
ACS Omega. 2022 Jul 7;7(28):24871-24880. doi: 10.1021/acsomega.2c03120. eCollection 2022 Jul 19.
The interfacial properties of a heterogeneous composite flooding system containing a surfactant fatty alcohol polyoxyethylene carboxylate (CEOC), branched-preformed particle gel (B-PPG), and polymer partly hydrolyzed polyacrylamide (HPAM) at the crude oil-water interface were investigated by a dilational rheology method. The results demonstrated that the CEOC molecules can form an elastic interfacial film with certain strength at the crude oil-water interface. The addition of HPAM to the CEOC solution has a detrimental effect on the interfacial film formed by CEOC molecules, leading to a decrease in the dilational modulus and an increase in the phase angle. Moreover, the addition of B-PPG to the CEOC solution also disrupts the stability and strength of the interfacial film of CEOC. In particular, linear HPAM with a lower steric hindrance is more likely to insert into the interfacial film of CEOC; thus, HPAM possesses a stronger destruction ability for the interfacial film of CEOC than B-PPG. When HPAM is compounded with B-PPG, a superimposed effect exists to cause more severe disruption for the interfacial film. The heterogeneous composite flooding system not only enhances oil recovery by increasing the viscosity of the bulk phase but also weakens the interfacial film to facilitate the post-treatment of the recovered crude oil. Thus, the heterogeneous composite flooding system exhibits promising prospects in practical application.
采用拉伸流变学方法研究了一种非均相复合驱油体系在原油 - 水界面的界面性质，该体系包含表面活性剂脂肪醇聚氧乙烯羧酸盐（CEOC）、支链型预形成颗粒凝胶（B - PPG）和聚合物部分水解聚丙烯酰胺（HPAM）。结果表明，CEOC分子能够在原油 - 水界面形成具有一定强度的弹性界面膜。向CEOC溶液中添加HPAM会对CEOC分子形成的界面膜产生不利影响，导致拉伸模量降低和相角增大。此外，向CEOC溶液中添加B - PPG也会破坏CEOC界面膜的稳定性和强度。特别是，空间位阻较小的线性HPAM更易插入CEOC的界面膜中；因此，HPAM对CEOC界面膜的破坏能力比B - PPG更强。当HPAM与B - PPG复配时，存在叠加效应，会对界面膜造成更严重的破坏。该非均相复合驱油体系不仅通过提高连续相粘度来提高原油采收率，还能削弱界面膜，便于对采出原油进行后续处理。因此，该非均相复合驱油体系在实际应用中具有广阔的前景。
