Wettability control agent and application thereof

The invention provides a wettability control agent and application thereof. The wettability control agent comprises the following raw materials: nanometer silver halide and a surfactant. Accorditgn tothe wettability control agent provided by the invention, the imbibition process of the wettability control agent show that the water absorption gas displacement and the oil absorption gas displacement of rock core having been treated with the wettability control agent are both reduced; namely, in a gas/water system, the amount of water spontaneously absorbed into core pores is reduced, and the amount of water which can flow is increased; in a gas/oil system, the amount of oil spontaneously sucked into core pores is reduced, and flowable oil is increased; and the wettability control agent enhances the liquidity of a liquid phase, so irreducible water saturation or residual oil saturation can be reduced, the condensate aggregation of fluids in an oil layer can be reduced, and the productioncapacity of a condensate