In-situ crosslinking and subsequent gelation of water-soluble polymer solution in the vicinity of the wellbore has caused drastic reduction in water mobility of treated production wells. Relative permeability to water has been sharply decreased allowing increases in oil fractional flow toward the wellbore. The favorable changes in the reservoir near the wellbore have caused a considerable reduction in operating costs by reducing water production and associated lifting, separation and treating, transportation, and disposal costs.

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