Preparation and properties of supramolecular self-assembled nanoparticle profile control agent

As an important technology for water channeling treatment in heterogeneous reservoirs, deep profile control technology has garnered widespread application in the field of tertiary oil recovery. In order to achieve a balance between injectivity and deep reservoir sealing effect, in this paper, nanoparticles with self-assembly function were prepared by emulsion polymerization, based on the host-guest recognition mechanism, using acrylamide, N, N'-methylene-diacrylamide, cetyldimethyl allyl ammonium chloride, allyl-beta-cyclodextrin and styrene as raw materials. It is obvious that nanoparticles with excellent dispersion are also more stable when exposed to heat than conventional polyacrylamide particles. The results of molecular dynamics analysis showed that beta-cyclodextrin groups and hydrophobic long chain groups could enter from a wide mouth and have a stable existence. The core flooding experiment showed that the water channeling channel is blocked by injecting dispersed nanoparticle profile control agent into the core. Given the robust host-guest interplay between the beta-cyclodextrin moiety and the hydrophobic long-chain group, these nanoparticles tend to spontaneously aggregate into clusters once they penetrate the core. The injection and plugging performance of artificial cores with an average permeability of 120 x 10-3 mu m2 and 250 x 10-3 mu m2 were investigated, and the residual resistance coefficients obtained after the experiments were 6.47 and 3.05, respectively.