In tertiary oil recovery, surfactants, as a type of chemical oil displacement agent, can improve oil recovery by reducing the interfacial tension between oil and water, increasing the fluidity of crude oil. Surfactants can be used alone or in combination
1.1 lon pair composite surfactant
Ultra-low interfacial tension,broad spectrum, high oil washing capacity,anti-adsorptionability andhigh salinity resistance
1.2 Negative non-ionic surfactant
Ultra-low interfacial tension,good adsorption resistance and oil washing ability
1.3Fatty acid surfactant
Ultra-low interfacial tension,calcium and magnesium resistance,good thermal stability and broadspectrum
| No | Item | Indicator | Test result |
| 1 | Appearance | Uniform liquid, no pungent odor | Uniform liquid, no pungent odor |
| 2 | pH value | 6.0-9.0 | 7.0 |
| 3 | Water solubility | Uniform dissolution, no stratification, no flocculation, precipitation | Uniform dissolution, no stratification, no flocculation, precipitation |
| 4 | Solid content, % | ≥45.0 | 48.0 |
| 5 | Interfacial tension, mN/m | ≤9.9×10⁻³ | 2.1×10⁻³ |
| 6 | Interfacial tension after adsorption, mN/m | ≤9.9×10⁻³ | 3.5×10⁻³ |
| 7 | Washing oil rate, % | ≥40.0% | 45.6 |
| 8 | Organochlorine content, % | 0.0 | 0.0 |
| 9 | Thermal stability, mN/m | ≤9.9×10⁻³ | 4.7×10⁻³ |
In tertiary oil recovery, surfactants, as a type of chemical oil displacement agent, can improve oil recovery by reducing the interfacial tension between oil and water, increasing the fluidity of crude oil. Surfactants can be used alone or in combination with chemicals such as polyacrylamide and alkali to form binary or ternary composite oil displacement systems.
Reducing oil-water interfacial tension: Surfactants can significantly reduce the interfacial tension between oil and water, promote the detachment and effective dispersion of crude oil from rocks, and drive residual oil, thereby improving oil washing efficiency and increasing crude
oil recovery.
When extracting heavy oil, surfactants can transform high viscosity heavy oil into low viscosity oil-in-water emulsions, thereby reducing the viscosity of crude oil and making it easier toextract to the surface.
