Nanoparticle modified polyacrylamide for enhanced oil recovery at harsh conditions

FUEL

卷:268

Article

Haruna, Maje Alhaji¹  Gardy, Jabbar¹  Yao, Guice¹  Hu, Zhongliang¹  Hondow, Nicole¹  Wen, Dongsheng^1,2 

[1] Univ Leeds, Sch Chem & Proc Engn, Leeds LS2 9JT, W Yorkshire, England

[2] Beihang Univ, Sch Aeronaut Sci & Engn, Beijing 100191, Peoples R China

关键词: Enhanced oil recovery;    Polymer flooding;    Polyacrylamide;    Silicon dioxide nanoparticles;    High temperature and high salinity;    Stability;   

DOI  :  10.1016/j.fuel.2020.117186

来源: Elsevier

【 摘 要 】

Silicon dioxide (SiO2) nanoparticles (NPs) have been recently proposed to increase the performance of polyacrylamide (PAM) for enhanced oil recovery (EOR) applications. However, SiO2/PAM nanocomposites tend to agglomerate or even desposit under harsh conditions such as high temperature-high salinity (HT-HS), which greatly decreases the potential for future field applications. In this work, SiO2 NPs were modified by (3-aminopropyl) triethoxysilane (M_SiO2) to create positively charged active groups that enabled strong interaction with PAM functional groups, leading to high dispersion stability. Three samples including M_SiO2/PAM, SiO2/PAM and NP-free PAM were synthesised in-situ via free radical polymerisation, and their thermal stability, rheological properties and the effect of aging time were studied. It was found that M_SiO2 could reduce the thermal degradation of the polymer and safeguard its backbone, resulting in much better thermal stability of PAM in harsh environments. After 90 days of aging, SiO2/PAM and NP-free PAM had 45 and 78% viscosity reduction; whereas only 10% reduction was observed for M_SiO2/PAM. In addition, core-flooding experiments showed that M_SiO2/PAM solutions produced more oil recovery than those from SiO2/PAM and NP-free PAM solutions at HT-HS condition.

【 授权许可】

Free