Temperature-resistant and salt-resistant oil displacing polymer containing nano particles

Abstract

The invention discloses a temperature-resistant and salt-resistant oil displacing polymer containing nano particles. A preparation method of the polymer comprises the following steps that 1, the surface of nanosilicon dioxide is inoculated with amidogen, and modified nanosilicon dioxide is obtained; 2, modified nanosilicon dioxide, water-soluble monomers and water are mixed, the pH of the mixed system is adjusted to range from 4 to 8, nanosilicon dioxide is completely dispersed in the water, disodium edetate dehydrate, ferrous sulfate and tetramethylethylenediamine are added into the mixed system obtained after the pH is adjusted, then azobis(isobutylamidine hydrochloride), ammonium persulfate and hydrogen peroxide are added, the reaction I is carried out in the nitrogen atmosphere, the reaction II is carried out after temperature rise, the pH of the reaction product of the reaction II is adjusted to range from 8 to 9, constant-temperature ageing is carried out, and the polymer can be obtained after drying and smashing are carried out. The dispersing performance and high temperature stability of modified nanosilicon dioxide are utilized, through interaction between nanosilicon dioxide and the polymer, the rigidity of polymer molecules is improved, a network structure among the polymer molecules is formed, and excellent temperature resisting, salt resisting and ageing resisting performance and the like are generated.

Description

technical field [0001] The invention relates to a temperature-resistant and salt-resistant oil-displacement polymer containing nanoparticles, which belongs to the technical field of water-soluble polymer synthesis. Background technique [0002] Chemical flooding technology is one of the main technical measures to enhance oil recovery in my country, in which water-soluble polymer is one of the key chemical agents for chemical flooding, and the swept volume of the displacement fluid can be enlarged through the viscosification of the polymer to achieve a large The purpose of greatly enhancing oil recovery. At present, tertiary oil recovery technologies such as polymer flooding, binary compound flooding (polymer-surfactant), and ASP flooding (alkali-polymer-surfactant) have been widely used in major eastern oilfields such as Shengli, Daqing, and Liaohe. It has been widely used, and has achieved remarkable oil-increasing and precipitation effects and good economic and social bene...

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Problems solved by technology

[0006] The above-mentioned patents all achieve the improvement of polymer temperature and salt resistance by introducing functional monomers. During this process, there are often the following deficiencies: the preparation process of functional monomers is cumbersome, and there are follow-up operations such as purification, which increases product costs; Compared with amide monomers, functional monomers have poor polymerization activity, and the molecular weight of polymers is not high. During use, the concentration of polymers required is high; the introduction of hydrophobic functional monomers and internal salt functional monomers reduces the polymer During use, the dissolution time of the polymer increases, and the proportion of insoluble matter increases, which affects the use and promotion of the product

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