Thickened oil viscosity-reducing oil-displacing agent for cold production of shallow-thin-layer common thickened oil reservoir as well as preparation method and application thereof

The invention provides a thick oil viscosity-reducing oil-displacing agent for cold production of a thin-layer common thick oil reservoir as well as a preparation method and application of the thick oil viscosity-reducing oil-displacing agent, and belongs to the field of oilfield chemistry. The thick oil viscosity-reducing and oil-displacing agent provided by the invention comprises the following components in percentage by mass: 16%-18% of a nano surfactant, 28%-32% of an anionic surfactant, 22%-36% of a Gemini surfactant, 10% of a solubilizer and the balance of water. The viscosity-reducing and oil-displacing agent can be effectively applied to cold production viscosity-reducing and oil-displacing of a thin-layer common heavy oil reservoir with the formation water mineralization degree of less than or equal to 100000mg/L, the calcium and magnesium ion concentration of less than or equal to 2500mg/L and the formation temperature of less than or equal to 35 DEG C, and is simple in preparation process, low in