Temperature-resistant foam-stabilizing type low interfacial tension foaming agent and preparation method thereof

Abstract

The invention discloses a temperature-resistant foam-stabilizing type low interfacial tension foaming agent and a preparation method thereof. The temperature-resistant foam-stabilizing type low interfacial tension foaming agent comprises the following raw material components by mass percent: 0.18-0.25% of an anionic surfactant, 0.05-0.1% of an amphoteric surfactant, 0.08-0.15% of a nonionic surfactant and 99.2-99.69% of mineralized water, wherein the anionic surfactant is one of fatty acid polyoxyethylene ether sodium sulfate and disodium laureth sulfosuccinate; the amphoteric surfactant is one of erucamidopropyl sultaine and cocoamidopropyl betaine; the nonionic surfactant is one of coconutt diethanol amide and polyoxyethylene ether; the mineralized water is a mixed water solution of sodium chloride, sodium sulfate, sodium hydrogen carbonate, anhydrous calcium chloride and magnesium chloride hexahydrate. The temperature-resistant foam-stabilizing type low interfacial tension foaming agent, disclosed by the invention, has the advantages of high temperature resistance, good foam stability, low interfacial tension and the like.

Description

technical field [0001] The invention relates to the technical field of tertiary oil recovery, in particular to a temperature-resistant and foam-stabilizing foaming agent with low interfacial tension and a preparation method thereof. Background technique [0002] As the oilfield development enters the middle and late stages, the total recovery rate of primary oil recovery and secondary oil recovery is only about 40%, so most of the crude oil remains in the formation, and tertiary oil recovery technology is required to effectively improve the oil recovery rate of the reservoir. [0003] Polymer flooding, as the main measure of tertiary oil recovery, has been popularized and applied in my country and has been implemented. The main purpose of polymer flooding is to increase the viscosity of the injected water liquid phase, reduce the oil-water mobility ratio, increase the swept volume of the injected water or fluid, start the crude oil in the medium and low permeability reservoi...

AI Technical Summary

Problems solved by technology

[0009] In summary, none of the existing foaming agents for oil displacement can simultaneously have high temperature resistance (≥80°C), high foam stability (>20min), and effective reduction of oil-water interfacial tension to low interfacial tension (10 -2 The advantages of the category of mN / m order

Therefore, the existing technology still cannot meet the requirements of effectively plugging high-permeability layers, improving the sweep coefficient of medium and low-permeability layers, and greatly reducing the interfacial tension of oil and water during foam flooding at high temperatures.