A kind of polymer with surface active function and its preparation method and application

Abstract

The invention discloses a polymer with surface active function, its preparation method and application. This surface-active functional polymer contains a structural unit A, a structural unit B and a structural unit C, wherein the structural unit A is a structural unit having a structure shown in formula (1), and the structural unit B is a structural unit having a formula (2) ), the structural unit C is a structural unit having a structure shown in formula (3), and the viscosity-average molecular weight of the surface-active functional polymer is 5 million to 13 million. The polymer has good surface activity, ability to thicken water medium, good temperature and salt resistance and anti-aging performance. This kind of polymer oil displacement agent is suitable for medium and low permeability reservoirs and high temperature and high salinity reservoirs. It can be used in In tertiary oil recovery, the oil recovery rate is further enhanced.

Description

technical field [0001] The present invention relates to a polymer with surface active function, a preparation method of the polymer with surface active function, a polymer with surface active function prepared by the method, and the polymer with surface active function as an oil displacement agent application. Background technique [0002] In order to solve the problem of poor temperature resistance and salt resistance of polymers used for oil displacement, researchers proposed a method of introducing functional monomers into the molecules and increasing the molecular weight of polymers to improve the apparent viscosity and temperature resistance of polymer aqueous solutions. Salt performance, thus developed hydrophobic association polymers, comb polymers, temperature-resistant and salt-resistant polymers, etc., but these polymers do not have surface activity and oil washing ability. [0003] In the tertiary oil recovery technology, the three-component chemical composite fl...

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Problems solved by technology

[0007] In US4138381, US4463151 and EP426864, alkyl or alkylphenol polyoxyethylene ether acrylate surface-active monomers are copolymerized with acrylamide monomers, mainly utilizing the association of hydrophobic groups of surface-active monomers in water. Thereby, the viscosity of the copolymer is greatly increased, and the copolymer containing the surface active monomer component has better salt tolerance, but the amphiphilic macromonomer component is difficult to gather to the interface in the binary copolymer, therefore, The synthesized copolymer has poor surface activity

[0008] In CN1178802A, acrylamide monomer, surface active macromonomer and ionic monomer are copolymerized to obtain terpolymer, which has high viscosity but poor surface activity

People such as Sun Lili of Southwest Petroleum Institute (Sun Lili, Yang Xu, etc., the performance research of a kind of novel macromolecule surfactant, Southwest Petroleum Institute Journal, 2002, 24 (4), 53-55) adopt homogeneous polymerization method, synthesize a A kind of novel macromolecular surfactant (PS1), this macromolecular surfactant is acrylamide, acrylic acid, methyl methacrylate terpolymer, and the ability of this macromolecular surfactant to reduce surface tension is inferior to low molecular surfactant , compounded with inorganic salts, due to the synergistic effect, will produce a compounding performance superior to that of a single surfactant, making the surface tension lower, but the polymer surfactant has poor heat and salt resistance

People such as Jin Yong of Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences (Dong Yang, Jin Yong, etc., the synthesis of a polymerizable polyurethane polymer surfactant, Fine Chemical Industry, 2004, 21 (9): 658-661) used toluene diisocyanate and polyether as the main raw materials, synthesized a class of polymerizable nonionic polyurethane polymer surfactant with double bonds, the polymer surfactant can reduce the surface tension of the solution when the concentration is 0.06mol / L 37.6mN / m (25°C), and can still maintain good surface activity at very low concentrations. In addition, the ability of the polymerizable nonionic polyurethane polymer surfactant to reduce surface tension increases with the proportion of hydrophobic segments increases, but the polymerizable nonionic polyurethane polymer surfactant has poor polymerization activity and poor temperature resistance

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