Operating experience shows significant declines of actual productivity in oil and gas-condensate wells during exploitation. The decline of production rates in oil reservoirs occurs when the bottom-hole pressure (PP) is lower than the bubble-point pressure (P-bp). The production decline in gas-condensate wells is caused predominantly by precipitation of retrograde condensate in the I near-wellbore zones. This effect is significant in reservoirs with a high initial condensate content and, especially, in reservoirs wit residual oil. The experimental results of this study demonstrate that the decline of production rate occurs in reservoirs in which the pore surfaces are initially partly non-water wet (hydrophobic), or become hydrophobic during filtration of oil and condensate in the 1 porous medium. The procedure used for restoration of productivity in actual wells is described in general terms. The method is based on treatment of the reservoir with various chemicals to artificially alter the wettability of pore surfaces from completely or partially non-water wet (hydrophobic) to water wet (hydrophilic). The process is called hydrophilization, and results in the restoration of the initial productivity, reducing the probability of water coning an active aquifer or of water encroachment during water flooding operations. Results of practical, field application of hydrophilization are presented.