Feasibility Study of Applying Modified Nano-SiO2 Hyperbranched Copolymers for Enhanced Oil Recovery in Low-Mid Permeability Reservoirs
To improve oil recovery significantly in low-mid permeability reservoirs, a novel modified nano-SiO2 hyperbranched copolymer (HPBS), consisting of polyacrylamide as hydrophilic branched chains and modified nano-SiO2 as the core, was synthesized via an in situ free radical polymerization reaction. Th...
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| Veröffentlicht in: | Polymers 2019-09, Vol.11 (9), p.1483 |
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| creator | Lai, Nanjun Tang, Lei Jia, Na Qiao, Dongyu Chen, Jianlin Wang, Yong Zhao, Xubin |
| description | To improve oil recovery significantly in low-mid permeability reservoirs, a novel modified nano-SiO2 hyperbranched copolymer (HPBS), consisting of polyacrylamide as hydrophilic branched chains and modified nano-SiO2 as the core, was synthesized via an in situ free radical polymerization reaction. The structure and properties of the hyperbranched copolymer were characterized through a range of experiments, which showed that HBPS copolymers have better stability and enhanced oil recovery (EOR) capacity and also smaller hydrodynamic radius in comparison with hydrolyzed polyacrylamide (HPAM). The flooding experiments indicated that when a 1000 mg/L HPBS solution was injected, the resistance factor (RF) and residual resistance factor (RRF) increased after the injection. Following a 98% water cut after preliminary water flooding, 0.3 pore volume (PV) and 1000 mg/L HPBS solution flooding and extended water flooding (EWF) can further increase the oil recovery by 18.74% in comparison with 8.12% oil recovery when using HPAM. In this study, one can recognize that polymer flooding would be applicable in low-mid permeability reservoirs. |
| doi_str_mv | 10.3390/polym11091483 |
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The structure and properties of the hyperbranched copolymer were characterized through a range of experiments, which showed that HBPS copolymers have better stability and enhanced oil recovery (EOR) capacity and also smaller hydrodynamic radius in comparison with hydrolyzed polyacrylamide (HPAM). The flooding experiments indicated that when a 1000 mg/L HPBS solution was injected, the resistance factor (RF) and residual resistance factor (RRF) increased after the injection. Following a 98% water cut after preliminary water flooding, 0.3 pore volume (PV) and 1000 mg/L HPBS solution flooding and extended water flooding (EWF) can further increase the oil recovery by 18.74% in comparison with 8.12% oil recovery when using HPAM. In this study, one can recognize that polymer flooding would be applicable in low-mid permeability reservoirs.</description><identifier>ISSN: 2073-4360</identifier><identifier>EISSN: 2073-4360</identifier><identifier>DOI: 10.3390/polym11091483</identifier><identifier>PMID: 31514371</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Chain branching ; Copolymers ; Efficiency ; Enhanced oil recovery ; Feasibility studies ; Free radical polymerization ; Free radicals ; Mechanical properties ; Permeability ; Polyacrylamide ; Polymer flooding ; Polymerization ; Polymers ; Reservoirs ; Resistance factors ; Shear strength ; Silicon dioxide ; Solvents ; Viscoelasticity ; Viscosity ; Water flooding</subject><ispartof>Polymers, 2019-09, Vol.11 (9), p.1483</ispartof><rights>2019 by the authors. Licensee MDPI, Basel, Switzerland. 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The structure and properties of the hyperbranched copolymer were characterized through a range of experiments, which showed that HBPS copolymers have better stability and enhanced oil recovery (EOR) capacity and also smaller hydrodynamic radius in comparison with hydrolyzed polyacrylamide (HPAM). The flooding experiments indicated that when a 1000 mg/L HPBS solution was injected, the resistance factor (RF) and residual resistance factor (RRF) increased after the injection. Following a 98% water cut after preliminary water flooding, 0.3 pore volume (PV) and 1000 mg/L HPBS solution flooding and extended water flooding (EWF) can further increase the oil recovery by 18.74% in comparison with 8.12% oil recovery when using HPAM. 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| subjects | Chain branching Copolymers Efficiency Enhanced oil recovery Feasibility studies Free radical polymerization Free radicals Mechanical properties Permeability Polyacrylamide Polymer flooding Polymerization Polymers Reservoirs Resistance factors Shear strength Silicon dioxide Solvents Viscoelasticity Viscosity Water flooding |
| title | Feasibility Study of Applying Modified Nano-SiO2 Hyperbranched Copolymers for Enhanced Oil Recovery in Low-Mid Permeability Reservoirs |
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