Preparation method of nanoscale hyperbranched hydrophobically associating polyacrylamide

Abstract

The invention discloses a preparation method of nanoscale hyperbranched hydrophobically associating polyacrylamide, wherein the polyacrylamide is a nanoscale hyperbranched multi-arm hydrophobically associating polymer formed by grafting acrylamide, hexadecyl dimethyl allyl ammonium chloride and a 2-acrylamide-2-methylpropanesulfonic acid copolymer with pentaerythritol tetraacrylate as an inner core; S1, preparing a hexadecyl dimethyl allyl ammonium chloride hydrophobic monomer; S2, preparing materials; S3, preparing a water-phase monomer reaction solution; S4, preparing an oil-phase reaction liquid: dissolving pentaerythritol tetraacrylate in xylene, adding the obtained solution into the oil-phase solvent, uniformly stirring, adding an emulsifier, and magnetically stirring the mixture to obtain the oil-phase reaction liquid; S5: carrying out copolymerization reaction. According to the invention, the nanoscale hyperbranched hydrophobically associating polyacrylamide prepared by using aninverse microemulsion polymerization method has excellent shear resistance, hydrophobicity and salt resistance, has nanoscale size, and improves the crude oil recovery ratio.

Description

technical field [0001] The invention belongs to the technical field of polyacrylamide synthesis, and in particular relates to a preparation method of nanoscale hyperbranched hydrophobic association polyacrylamide. Background technique [0002] Polyacrylamide is a common polymer flooding in oilfields. With the increasing number of oil exploration in my country, the consumption of polyacrylamide products in the field of oilfield mining has shown a greater growth trend, but at high temperature and high salinity Under certain conditions, the molecular chain of polyacrylamide is prone to curling, resulting in a significant decrease in the viscosity of the solution. Traditional polyacrylamide mainly wants to achieve the purpose of increasing viscosity by increasing its molecular weight. Although this solves the problem of polyacrylamide temperature and salt resistance to a certain extent, it still cannot solve the problem of poor shear resistance and solution viscosity. Not high d...

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Problems solved by technology

However, the existing hydrophobically associated polyacrylamides are linear chain structures. Under high shear conditions, the molecular chain structure is unstable, easily broken or entangled, resulting in a sharp drop in viscosity, which ultimately affects the polymer flooding effect; in addition, the traditional emulsion The polyacrylamide modified by fluorine-containing hydrophobic monomers prepared by the polymerization method may have the problems of too long molecular chains and too large sizes. Large-sized polymers cannot penetrate deep into the formation and cannot be used for profile control and flooding in low-permeability reservoirs. oil process

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