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- Title
Rheological properties and gas channeling plugging ability in CO2 flooding of a hydrophobic nanoparticle-enhanced smart gel system constructed with wormlike micelles.
- Authors
Zhang, Zhirong; Sun, Linhui; Huo, Xu; Liu, Xianggui; Pan, Xiuxiu
- Abstract
Carbon Dioxide capture, oil displacement and Storage (CCUS-EOR) projects inject captured carbon dioxide into developed reservoirs suitable for gas displacement. However, due to the strong heterogeneity of the reservoir, the CO 2 channeling is seriously. In this study, using tung oil as renewable chemical raw material, environmentally friendly surfactants and hydrophobic nano-SiO 2 were synthesized as the main components of smart gel system. Fourier transform infrared (FT-IR), nuclear magnetic resonance spectrum (NMR) and thermogravimetric analysis (TGA) were used to characterize the chemical structure. The smart gel system was obtained through the CO 2 response experiment. The system can cycle back and forth between low and high viscosity multiple times, and a good temperature resistance and salt resistance. The results of rheological experiments and dynamic light scattering show that the nanoparticles promote the growth and entanglement of WLMs. The plugging capacity and auxiliary CO 2 -EOR performance of the system were evaluated through the laboratory displacement test. The intelligent response system has good gas channeling plugging ability, plugging efficiency reaches 97 %, and CO 2 flooding oil recovery efficiency increases by 22.2 %. In addition, in the acute toxicity assessment, the bio-based gel system from plants showed slightly toxic, which is expected to become a new generation of green oilfield chemicals. [Display omitted] • The rheological properties and temperature and salt tolerance of worm micelle gel were enhanced by nanoparticles. • Step by step profile control of fluids with different viscosity to further improve oil recovery. • Environmental friendly CO2 response gel was synthesized from tung oil.
- Subjects
RHEOLOGY; CARBON sequestration; NUCLEAR magnetic resonance; RAW materials; GAS reservoirs; GAS condensate reservoirs; FLOOD damage
- Publication
Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2024, Vol 202, p506
- ISSN
0263-8762
- Publication type
Article
- DOI
10.1016/j.cherd.2024.01.014