A surfactant system that produces ultra-low interfacial tension
By screening out specific ratios and concentrations of alkylbenzene sulfonate and C16-alkanolamide, a simple surfactant system is provided, which solves the problem that existing compound systems are difficult to achieve ultra-low interfacial tension and achieves efficient oil displacement effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LANZHOU INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
- Filing Date
- 2026-04-30
- Publication Date
- 2026-07-17
AI Technical Summary
In the prior art, although the combination system of sulfonate and alkanolamide surfactants can reduce the interfacial tension between oil and water, there is a lack of screening for the interfacial activity of different carbon chain alkanolamide systems, and other surfactants or auxiliaries are usually required to achieve ultra-low interfacial tension. It is not clear which carbon chain alkanolamide and alkylbenzene sulfonate combination can uniquely produce ultra-low interfacial tension.
When the mass ratio of alkylbenzene sulfonate to C16-alkanolamide is 2:1 to 1:3, and the total mass fraction of the surfactant system in the aqueous solution is not less than 0.05%, the oil-water interfacial tension is less than 1×10-3 mN/m.
It achieves the stable generation of ultra-low oil-water interfacial tension by a surfactant system consisting only of alkylbenzene sulfonate and C16-alkanolamide, without the need for the addition of other surfactants or additives, within a wide range of proportions and concentrations, significantly improving crude oil recovery and suitable for different formation conditions.
Smart Images
Figure CN122405296A_ABST
Abstract
Citation Information
Patent Citations
An oil displacement surfactant for high-temperature, high-salinity oil reservoirs, its preparation method and application
CN112251208B