Modifying and flooding agent for reutilization of residual polymers in formation and application thereof

The invention relates to a modifying and flooding agent for reutilization of residual polymers in a formation and an application thereof. The modifying and flooding agent for the reutilization of the residual polymers in the formation consists of 0.8-2.0% of aqueous medium dispersing type polyacrylamide and formation water. The modifying and flooding agent, provided by the invention, has the advantages of simplicity in system constitution, environment friendliness, short dissolving time, simple construction process, few utilized devices and suitability in field use of offshore polymer flooding. According to the modifying and flooding agent for the reutilization of the residual polymers in the formation, a flocculation system can be formed in the polymer flooding process and the subsequent water driving process by utilizing the residual polymers in the formation so as to effectively block a high-permeability channel, so that the modifying and flooding agent has capacities for delaying the penetration of polymer solution in the formation and improving a conformance factor, and the recovery efficiency of crude oil is improved, and the concentrations of the produced polymers are lowered.