Preparation,characterization and aggregation plugging characteristic of nanoparticles profile control agent
The study proposed the idea of dispersed injection in-situ aggregation plugging,using sty-rene and acrylamide as polymerization monomers to develop nanoparticles profile control agent with a surface containing amide groups and a core-shell heterogeneous structure.By injecting nanoparticles with a particle size much smaller than the pore throat size into the reservoir,the dispersed nanoparti-cles in the formation water are moved to the deep part of the reservoir and come into contact with the regulator in the formation to aggregate into a particle cluster that matches the size of the water break-through channel,achieving the plugging of the water breakthrough channel.The thermal decomposi-tion temperature of the prepared nanoparticles can reach more than 300 ℃,which can be suitable for high-temperature oil reservoirs.The expansion ratio of the nanoparticles is less than 2.0,which can effectively avoid the problem of shearing and breaking during the migration process due to the exces-sive expansion ratio.Core flooding experiments show that nanoparticles have good injectability and the injection pressure is almost the same as that of water injection.Nanoparticles can aggregate into parti-cle clusters after mixing with aggregation regulators,which can effectively block the pore-throats of the core.When the permeability of core is 0.1 μm2,the plugging rate of nanoparticles is more than 80%.
deep profile controlnanoparticles profile control agentparticle clustersplugging per-formance