Water flooding is widely used in the development of oil fields in the Russian Federation. It is essential for oil companies operating hundreds of oil reservoirs to compare them in terms of their performance. The paper presents a procedure for a comprehensive assessment of waterflood pattern efficiency enabling selection of proper stimulation techniques to improve reservoir development. The proposed procedure involves comparative assessment of development strategies for similar reservoirs in order to eliminate the effect of geological setting. Production targets are classified into the groups of similar reservoirs based on clustering according to their geological characteristics and production data indicating the stage of reservoir development. The paper presents the results of reservoir clustering. In the proposed procedure, the existing waterflood pattern efficiency is evaluated by 11 key reservoir performance indicators. A weighting factor is assigned to each indicator based on its significance in terms of waterflooding efficiency. The range of normalized values for key indicators, from minimum to maximum, is divided into five intervals, each having an assigned score. Based on the key indicators, comparative assessment of reservoir performance is made. The highest-ranking reservoir is identified in each group and its key performance indicators are analyzed in comparison with the other reservoirs in this group. Various stimulation techniques are selected for the reservoirs to improve their performance and rating.
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