Reviewed are technologies and processes, phased developed by TatNIPlneft from 1967 till now, providing for integrated solution of cost reduction problem in connection with sharp water cut increase by preliminary disposal of water and elimination of extra ballast flows, utilization of disposed waters in formation pressure maintanace system due to high quality of water conditioning (JGF, AOSV); optimization of water conditioning for injection into formations with different permeabilities within the frame of cascade system of pressure maintanance.