Rheology, Phase Stability, and Microstructure of Nanosilica-Assisted Partially Hydrolyzed Polyacrylamide

IF 5.2 3区 工程技术 Q2 ENERGY & FUELS
Yuzhou Zhao, Gideon Dordzie, Chun Huh, Matthew Balhoff and Yingda Lu*, 
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Abstract

Partially hydrolyzed polyacrylamide (HPAM) is widely used for chemical enhanced oil recovery but its performance can be greatly reduced under harsh reservoir conditions. One proposed method of improving the performance of polymer flooding under reservoir conditions is the addition of functionalized nanoparticles (NPs). In this study, we systematically investigated the effects of adding hydrophobic or hydrophilic silica nanoparticles on the rheology, phase stability, and microstructure of HPAM solutions. Adding low concentrations of NPs slightly reduces the viscosity of the solutions but the presence of a high quantity of NPs (>0.5 wt %) makes the solution more viscous, elastic, and shear thinning. The results of dynamic light scattering reveal that these effects are mainly caused by the reversible formation of a large HPAM-NP network, which consists of HPAM chains weakly connected by NPs. When kept under static conditions, the NP-HPAM mixtures tend to undergo phase separation in a few days, but this issue is less likely to be a concern in field-scale polymer flooding during which the fluids are under constant flow. The findings of this study provide potential solutions to improve the performance of polymer flooding under high-salinity reservoir conditions.

Abstract Image

纳米二氧化硅辅助部分水解聚丙烯酰胺的流变学、相稳定性和微观结构
部分水解聚丙烯酰胺(HPAM)被广泛用于化学提高采收率,但在恶劣的储层条件下,其性能会大大降低。在油藏条件下提高聚合物驱性能的一种方法是添加功能化纳米颗粒(NPs)。在这项研究中,我们系统地研究了加入疏水或亲水二氧化硅纳米颗粒对HPAM溶液流变学、相稳定性和微观结构的影响。添加低浓度的NPs会略微降低溶液的粘度,但大量NPs (>0.5 wt %)的存在会使溶液更具粘性、弹性和剪切变薄。动态光散射结果表明,这些效应主要是由一个大的HPAM- np网络的可逆形成引起的,该网络由NPs弱连接的HPAM链组成。在静态条件下,NP-HPAM混合物往往会在几天内发生相分离,但在流体恒定流动的现场规模聚合物驱中,这个问题不太可能成为问题。该研究结果为提高高矿化度油藏条件下聚合物驱的性能提供了潜在的解决方案。
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来源期刊
Energy & Fuels
Energy & Fuels 工程技术-工程:化工
CiteScore
9.20
自引率
13.20%
发文量
1101
审稿时长
2.1 months
期刊介绍: Energy & Fuels publishes reports of research in the technical area defined by the intersection of the disciplines of chemistry and chemical engineering and the application domain of non-nuclear energy and fuels. This includes research directed at the formation of, exploration for, and production of fossil fuels and biomass; the properties and structure or molecular composition of both raw fuels and refined products; the chemistry involved in the processing and utilization of fuels; fuel cells and their applications; and the analytical and instrumental techniques used in investigations of the foregoing areas.
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