Bottom water plugging agent system and process for horizontal well

The invention discloses a bottom water plugging agent system and process for a horizontal well. The bottom water plugging agent system for the conventional horizontal well is characterized by comprising an inorganic precipitation type system and a polysilicon system or polymer gel system.The bottom water plugging agent system for the thermal-recovery horizontal well is characterized by comprising an inorganic precipitation type system and a N2 foam system or temperature-sensitive gel system. The bottom water plugging agent process for the horizontal well comprise the following steps: (1) injecting an annular chemical plugging device by using a mechanical packer plugging device on the basis of clarifying a water outlet point so as to ensure the selectivity of the injection; (2) selecting the bottom water plugging agent system according to the temperature, the heterogeneity and other parameters of the oil reservoir at the horizontal well; and (3) injecting the bottom water plugging agent system. The bottom water plugging agent system is selected reasonably and combined properly. The technology of the bottom water plugging agent process can be applied to the horizontal well with high or ultrahigh water content to achieve the purpose of deeply plugging more than 90% of bottom water at high strength, so that the water content of the horizontal well is reduced effectively, and the productivity of the oil well is improved.