Production of unwanted water has consistently burdened the industry since the costs of lifting, separating, and disposing of produced water make oil and gas production less profitable. Previous methods for reducing water production have involved the sequential pumping of two or more materials to form plugs within the formation to control water flow. These materials have been neither effective nor selective in-reducing only the flow of water.

The recent introduction of new water control chemicals, which are designed to, reduce the flow of water while not effecting hydrocarbon flow have experienced limited success. One reason for the minimal success rate has been the inability of these polymers to withstand shear. In addition, poor candidate selection has created a high volume of unsuccessful treatments, causing operators to shy away from their use.

A selective, one component system using a new amphoteric polymeric material (APM) has been developed which has the ability to reduce the effective permeability to water while retaining the formation permeability to oil or gas.

In addition a candidate selection technique used to predict the likelihood of success of a water control treatment is presented.

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