Journal
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
Volume 89, Issue 10, Pages 1681-1693Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1070427216100189
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Funding
- National Natural Science Foundation of China [51404208]
- Second Session of the Young and Middle-aged Backbone Teachers Training Program of Southwest Petroleum University
- Scientific research project of Southwest Petroleum University [2014QHZ014]
- National College Students Innovation and Entrepreneurship Training Program [201510615008]
- China Scholarship Council
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A novel water-soluble hyperbranched polymer (AA/AM/SMNS) consisting of functionalized Nano-SiO2 as the core was synthesized by free-radical polymerization for low-moderate permeability reservoirs. The AA/AM/SMNS was carefully characterized by spectroscopic and electronic technologies. It was found that the microscopic structures of AA/AM/SMNS was denser and more regular in comparison to the linear polymer HPAM. The hydrodynamic radius of AA/AM/SMNS was 197 nm, less than the HPAM radius of 244 nm with similar molecular weight, so that the AA/AM/SMNS had a good matching relationship with pore throat in midpermeability reservoirs (100-500 mD). Besides, the introduction of Nano-SiO2 endowed the AA/AM/SMNS remarkable thermal stability, shear resistance and viscoelasticity. Based on core flooding experiments, the AA/AM/SMNS could build high resistance factor and residual resistance factor in the corresponding porous medium. Furthermore, the sheared AA/AM/SMNS solution of 1500 mg L-1 performed excellent oil recovery of 15.47% in the 300 mD porous medium, which suggested the hyperbranched polymer based on modified Nano-SiO2 have a valuable prospect for enhancing oil recovery in low-moderate permeability reservoirs.
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