Presented are the results of long term researches on solution of the problem of rational utilization of formation and injected waters energy, using as on example Tatarstan and West Syberia oil fields. Reviewed ore causes of productive formations watering-out and methods of their isolation. Developed is a new way of producing wafer isolating moss under formation conditions on the basis of flocculation properties of polymers against rocks＇ dispersed particles, leading to formation of polymer-dispersed systems.