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Energies 2014, 7(6), 3858-3871; doi:10.3390/en7063858
Article

Aqueous Hybrids of Silica Nanoparticles and Hydrophobically Associating Hydrolyzed Polyacrylamide Used for EOR in High-Temperature and High-Salinity Reservoirs

1
,
1
,
1
 and
1,2,*
1 Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China 2 State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065, China
* Author to whom correspondence should be addressed.
Received: 1 April 2014 / Revised: 19 May 2014 / Accepted: 9 June 2014 / Published: 19 June 2014
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Abstract

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 °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.
Keywords: silica nanoparticles; hydrophobically associating polyacrylamide; rheological properties; enhanced oil recovery silica nanoparticles; hydrophobically associating polyacrylamide; rheological properties; enhanced oil recovery
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Zhu, D.; Wei, L.; Wang, B.; Feng, Y. Aqueous Hybrids of Silica Nanoparticles and Hydrophobically Associating Hydrolyzed Polyacrylamide Used for EOR in High-Temperature and High-Salinity Reservoirs. Energies 2014, 7, 3858-3871.

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