Preparation and performance of nano-depressurization and augmented injection system for heavy oil thermal recovery
A nano-depressurization and augmented injection system was prepared for heavy oil thermal recovery to reduce steam injection pressure and crude oil viscosity,and its performance was evaluated.The experimental results indicate the optimal formulation of the system for heavy oil thermal recovery as 49.75%(w)nano-complexed monomer+49.75%(w)solvent oil+0.50%(w)phenol-based polyoxyethylene ether.At a dosage of 10%(w)and after aging at 350℃for 2 h,the viscosity reduction rate of heavy oil reaches 92.69%,showing high heat resistance and strong solubility for large molecules like asphalt.When 0.1 PV of the nano-depressurization and augmented injection system is used as a pre-slug,it can reduce steam injection pressure by 3.99 MPa.The system demonstrates excellent pressure reduction and injection augmentation performance at various temperatures and permeability levels.
heavy oilnano-materialviscosity reduction ratedepressurization and augmented injection
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