Surfactant for displacing high-colloid-content asphaltene crude oil as well as preparation method and application of surfactant

The invention provides a surfactant suitable for displacement of high-colloid-content asphaltene crude oil as well as a preparation method and application of the surfactant, and belongs to the technical field of oilfield chemistry. The surfactant suitable for oil displacement of the high-colloid-content asphaltene crude oil, provided by the invention, is prepared from the following components in percentage by mass: 20 percent to 30 percent of alkyl imidazoline dicarboxylate, 10 percent to 20 percent of fatty alcohol-polyoxyethylene ether, 5 percent to 10 percent of an imbibition nano oil displacement agent, 5 percent to 10 percent of low-carbon alcohol, 5 percent to 10 percent of ethylene glycol and the balance of water. The imidazoline dicarboxylate, the fatty alcohol-polyoxyethylene ether and the dialysis nano oil displacement agent are compounded, the synergistic effect of multiple groups is exerted, the dispersion effect of the surfactant on colloidal asphaltene in crude oil is enhanced, the oil-water int