Next Article in Journal
A Novel Strategy for the Synthesis of Amphiphilic and Thermoresponsive Poly(N-isopropylacrylamide)-b-Polystyrene Block Copolymers via ATRP
Previous Article in Journal
Amphoteric Ion Exchange Membranes Prepared by Preirradiation-Induced Emulsion Graft Copolymerization for Vanadium Redox Flow Battery
Open AccessArticle

Feasibility Study of Applying Modified Nano-SiO2 Hyperbranched Copolymers for Enhanced Oil Recovery in Low-Mid Permeability Reservoirs

1
School of Chemistry and Chemical Engineering of Southwest Petroleum University, Chengdu 610500, China
2
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610500, China
3
State Key Laboratory of Molecular Engineering of Polymer, Fudan University, Shanghai 200433, China
4
Faculty of Engineering and Applied Science, University of Regina, Regina, SK S4S 0A2, Canada
5
Engineer Technology Research Institute, CNPC Xibu Drilling Engineering Company Limited, Urumqi 830001, China
6
CNPC Xinjiang Oilfield Company, Karamay 834000, China
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(9), 1483; https://doi.org/10.3390/polym11091483
Received: 8 August 2019 / Revised: 2 September 2019 / Accepted: 9 September 2019 / Published: 11 September 2019
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. View Full-Text
Keywords: modified nano-SiO2; hyperbranched copolymer; enhanced oil recovery; low-mid permeability reservoir modified nano-SiO2; hyperbranched copolymer; enhanced oil recovery; low-mid permeability reservoir
Show Figures

Graphical abstract

MDPI and ACS Style

Lai, N.; Tang, L.; Jia, N.; Qiao, D.; Chen, J.; Wang, Y.; Zhao, X. Feasibility Study of Applying Modified Nano-SiO2 Hyperbranched Copolymers for Enhanced Oil Recovery in Low-Mid Permeability Reservoirs. Polymers 2019, 11, 1483.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map

1
Back to TopTop