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

Open Access
Publisher Website
Google Scholar
Abstract
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.
Funding Information
  • National Natural Science Foundation of China (51674208/51404208)
  • Department of Science and Technology of Sichuan Province (2018JY0515)
  • State Key Laboratory of Molecular Engineering of Polymers (K2017-25)
  • State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (PLC20180103)
  • PetroChina Innovation Foundation (2018D-5007-0207)
  • Science and Technology Strategic Cooperation of Nanchong city and University of Science and Technology Program of Nanchong city, Sichuan, China (NC17SY4017)

This publication has 33 references indexed in Scilit: