Improving oil production for high water cut well by diesel injection
After a long period of production, formation water breakthrough into the well not only reduces oil rate but also causes difficulties for operation. A major problem is to recover well performance in case of high water cut after shut-in period.
In case of shutting-in high water cut production wells, water volume will be settled down near the wellbore. After re-opening, oil rate will be reduced and water cut is higher than before shutting-in. This phenomenon is caused by the effect of hysteresis that reduces oil relative permeability. Application of this hysteresis phenomenon can maintain production for high water cut wells after shut-in stage by injecting non-wetting fluid (diesel).
From phenomenal research to simulation and actual implementation at DD-3P and DD-7P wells using diesel injection method, it has been shown that the re-starting of wells after long shut in period was easy and the oil production was increased by about 20 - 40% for a certain period of time.
In this study, the authors present a specific procedure including selecting a suitable diesel pump, designing pump volume, simulating and deploying. The result of the study is highly practical not only for Thang Long - Dong Do field but also for nearby fields where high water cut problems are encountered.
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