A Novel Supercritical CO₂ Foam System Stabilized With a Mixture of Zwitterionic Surfactant and Silica Nanoparticles for Enhanced Oil Recovery.

ABSTRACT: In order to improve the CO₂ foam stability at high temperature and salinity, hydrophilic silica nanoparticles (NPs) were added into a dilute zwitterionic surfactant solution to stabilize supercritical CO₂ (SC-CO₂) foam. In the present paper, the foaming capacity and stability of SC-CO₂ foam were investigated as a function of NP concentration at elevated temperatures and pressures. It was observed that the drainage rate of SC-CO₂ foam was initially fast and then became slower with NPs adsorption at the gas-liquid interface. The improved foam stability at high temperature was attributed to the enhanced disjoining pressure with addition of NPs. Furthermore, an obvious increase in the foam stability was noticed with the increasing salinity

SUBMITTER: Li W 

PROVIDER: S-EPMC6828982 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature