This paper will present the implementation of pattern water flood in a very complex field in Romania. It’s a multi layering formation with thin 2–5 m highly permeable (up to 2 Darcy) unconsolidated sands and unknown fluid contacts. Additionally high mobility ratio (around 50) and unfavourable rock wettability complicate waterflooding process. Project considered different injection schemes like peripheral, line drive and pattern. Integrated approach is presented here that includes depositional environment analysis, 3D seismic, acquisition of complex log to investigate current oil saturation, field injectivity tests, pilot water injection and intensive surveillance plan. Water injection is part of field redevelopment plan and will increase recovery factor by 7.3%.


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