期刊
ENERGIES
卷 7, 期 6, 页码 3858-3871出版社
MDPI AG
DOI: 10.3390/en7063858
关键词
silica nanoparticles; hydrophobically associating polyacrylamide; rheological properties; enhanced oil recovery
资金
- Distinguished Youth Fund of Sichuan Province [2010JQ0029]
- Natural Science Foundation of China [21173207, 21273223]
Water-soluble polymers are known to be used in chemically enhanced oil recovery (EOR) processes, but their applications are limited in high-temperature and high-salinity oil reservoirs because of their inherent poor salt tolerance and weak thermal stability. Hydrophobic association of partially hydrolyzed polyacryamide (HAHPAM) complexed with silica nanoparticles to prepare nano-hybrids is reported in this work. The rheological and enhanced oil recovery (EOR) properties of such hybrids were studied in comparison with HAHPAM under simulated high-temperature and high-salinity oil reservoir conditions (T: 85 degrees C; total dissolved solids: 32,868 mg.L-1; [Ca2+] + [Mg2+]: 873 mg.L-1). It was found that the apparent viscosity and elastic modulus of HAHPAM solutions increased with addition of silica nanoparticles, and HAHPAM/silica hybrids exhibit better shear resistance and long-term thermal stability than HAHPAM in synthetic brine. Moreover, core flooding tests show that HAHPAM/silica hybrid has a higher oil recovery factor than HAHPAM solution.
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