| abstract |
Disclosed in the present invention are a gemini surfactant for oil displacement, and a preparation method for and an application of the gemini surfactant. The gemini surfactant is 1,3-dialkyl-1,3-dipolyoxyethylene ether urea or 1,3-dialkyl-1,3-dipolyoxypropylene ether urea. The gemini surfactant for oil displacement provided by the present invention has good chemical stability and excellent salt tolerance in a wide pH range, has good performance in reducing interfacial tension, and can enhance the oil recovery by about 18% when applied in alkali-free binary (surfactant + polymer) combination flooding. |