Injection of produced water through production wells into underlying horizon is an advanced technique of formation water disposal, without lifting water on the surface. The effectiveness of this method lays in considerable economy of energy and material resources at well production, preparation of commercial oil, prevention of corrosion, depreciation and scale precipitation due to reduction of ineffective pumping of the produced fluid. This technology is also effective because helps to solve the problem of inefficient development of the reservoirs with low reservoir pressure. Forecasted economic potential at implementation of Commingled Production and Injection Technology in five wells will count more than 100 MRb per year, and this is not taking into account the need to drill additional network of wells to maintain reservoir pressure, because both production and injection is carried out within a single wellbore.

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