文献类型：期刊文献

英文题名：The recovery of viscosity of HPAM solution in presence of high concentration sulfide ions

作者：Liu, Jin-Feng[1,2,3];Feng, Jun-Ying[1,2];Yang, Shi-Zhong[1,2,3];Gang, Hong-Ze[1,2,3];Mu, Bo-Zhong[1,2,3]

机构：[1]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Engn Res Ctr Microbial Enhanced Oil Recovery, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2020

卷号：195

外文期刊名：JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING

收录：;EI(收录号：20202808915744);WOS:【SCI-EXPANDED(收录号:WOS:000586002900062)】；

基金：This research was funded by the National Key Research and Development Program of China (No. 2017YFB0308901), National High Technology Research and Development Program of China (863 Program) (Grant No. 2013AA064403), and National Natural Science Foundation of China (No. 41673084).

语种：英文

外文关键词：Partially hydrolyzed polyacrylamide; Viscosity; Mechanism; Sulfide ion; Amide group

摘要：Partially hydrolyzed polyacrylamide (HPAM) is widely used as a viscosity-enhancing agent in oil recovery. However, significant viscosity loss has been reported for HPAM solutions in the presence of S2-. Surprisingly, in this study, we found that this loss could be recovered by adding more S2-. To address this issue, the rheological behavior, hydrodynamic radius, and chemical structure of HPAM were investigated simultaneously using rheometry, dynamic light scattering (DLS), Fourier-transform infrared (FT-IR) spectroscopy, and 1H nuclear magnetic resonance (NMR) spectroscopy. The viscosity of the HPAM solution dropped sharply in the presence of trace S2- (<10 mg/L), then partially recovered as S2- concentration increased from 10 to 400 mg/L, and finally plateaued at higher concentrations. Also, the change in viscosity with increase of S2- concentration was found to be in consistent with that in hydrodynamic radius of HPAM in aqueous solutions. Furthermore, FT-IR and 1H NMR spectra suggest that the amide amino groups were chemically altered by S2-, changing the chemical environment of the methyne proton. Interaction between amide groups and the trace S2- reduced the hydrodynamic radius and destroyed the HPAM network structure, thus reducing viscosity. In contrast, with increase in S2- concentration, more and more S2- "linked" to amide groups via interactions between them, resulting in the enhanced electrostatic repulsion between these S2-. Consequently, the repulsion made the HPAM molecule more stretched and the network fluffier, helping to recover the viscosity loss. Herein, the whole picture and mechanism of S2--induced viscosity changes in an HPAM solution are evaluated for the first time.