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

Dingwei Zhu, Limin Wei, Biqing Wang and Yujun Feng
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Dingwei Zhu: Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
Limin Wei: Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
Biqing Wang: Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
Yujun Feng: Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China

Energies, 2014, vol. 7, issue 6, 1-14

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 ; [Ca 2+ ] + [Mg 2+ ]: 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 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2014
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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