Over the course of many years of production, fields that were producing for decades begin to reach mature stages. Most producers at these oilfields have high watercut, and these negative effects the oil production. However, the reason why the wells have a high watercut may not even be related to injectors which cause reservoir flooding, or to bottom-water coning. Typically, the cause of flooding in producers are behind casing and inside casing circulations, tubing leaks, bottom hole leaks, etc., while hydrocarbon reserves around such wells remain unprocessed. After performing water shut-offs on wells with these complications, it is now possible to reduce watercut and also develop poorly drained reserves. The purpose of this paper is to identify "problematic" wells which have high watercut and contain potentially uncovered reserves, which can be fixed by water shut offs to increase recovery factor.

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