Method for preparing high-strength high-temperature-resistance polymer nanospheres

Abstract

The invention relates to a preparing method of high-intensity high-temperature-resistance polymer nanometer microspheres. The preparing method comprises the following characteristic process steps that itaconic acid is neutralized by a sodium hydroxide solution; acrylamide, cross-linking agents and a hectorite aqueous dispersion are added; the mixture is uniformly stirred, and a monomer and hectorite mixed solution is obtained; then, the monomer and hectorite mixed solution is added into a three-necked flask containing oil-soluble solvents and Span80/Tween80 composite surfactants; uniform stirring is carried out, and a transparent reversed-phase microemulsion is formed; the reversed-phase microemulsion is heated, then, a certain amount of oxidizing agents and reducing agents are added for initiating reversed-phase microemulsion polymerization; and demulsification, precipitation, washing, drying and fine grinding are carried out, and white polymer nanometer microsphere powder is obtained. The polymer nanometer microspheres prepared by the preparing method provided by the invention have the proper water absorption and salt absorption properties, better water absorption swelling property, higher jelly strength and higher temperature resistance, and meet the ultra-low permeability reservoir profile control and water shutoff requirements that the water absorption speed of polymer deep profile control agents is not suitable to be too high or too low, the water absorption rate is not suitable to be too high or too low, the permeability is smaller than 1*10<-3>[mu]m<2>, and the pore throat radius is smaller than 8[mu]m.

Description

technical field [0001] The invention relates to a method for preparing high-strength and high-temperature-resistant polymer nanospheres. The high-strength and high-temperature-resistant polymer nanospheres prepared by the invention can be widely used in oil field profile control and oil displacement, heavy metal ions and dye adsorption and Separation and water treatment, etc. Background technique [0002] In the course of reservoir development, water injection development is the most economical and effective means to replenish formation energy and enhance oil recovery. Since most of my country's oil reservoirs belong to continental deposits, the oil saturation is relatively low, the reservoirs are scattered, and the permeability gradient is large. Therefore, water injection development often forms large-scale seepage channels in the water phase, and the injected water cannot effectively push the crude oil in the reservoir. , quickly flow out from the oil well, forming an inv...

AI Technical Summary

Problems solved by technology

[0009] Microemulsion polymerization is a simple and easy method to prepare 10-100nm polyacrylamide microspheres. At present, the acrylamide nanospheres prepared by inverse microemulsions at home and abroad mainly have a single organic network structure. Linked, the formed organic network is brittle and insufficient in heat resistance, the storage modulus is greatly affected by the degree of cross-linking, and the plugging strength needs to be improved

There is no research and report on polymer nanospheres with inorganic and organic double network structure, high strength and high temperature resistance at home and abroad