Patent ID: 11952536
Assignee: PETROCHINA COMPANY LIMITED
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  E | IPC C  E

Claim 15:
16. Method of using of a carbon dioxide responsive self-thickening smart fluid according to claim 1 in a carbon dioxide gas flooding, wherein the method comprises:
the single-chain amide molecules with tertiary amine head groups and Gemini surfactants with quaternary ammonium head groups in the carbon dioxide responsive self-thickening smart fluid forming a vesicle structure through self-assembly;
injecting the carbon dioxide responsive self-thickening smart fluid into the formation and exposed to CO2 gas, the single-chain amide molecules with tertiary amine head groups being protonated to transform the surfactant structure from a vesicle to a worm-like micelle, to increase the system viscosity; and
the increased system viscosity increasing the resistance for gas channeling along the local high permeability channel, and directing the gas to the low-permeability area.