Watercut diagnostics based on correlation with liquid production

Aim. Efficient production of hydrocarbons from brown fields becomes more and more important with each year due to the depletion of existing fields and a decreasing number of new fields being discovered. This task cannot be solved without organizing an effective reservoir pressure maintenance system and analyzing vertical and lateral sweep. The article presents the results of the application of an advanced technology for analyzing a large array of data available to solve this problem.

Materials and methods. Traditionally, to solve the problem of improving the efficiency of the reservoir pressure maintenance system and increasing reserves recovery, costly studies are used, including production logging, multi-rate well-tests, cross-well tracer studies, cross-well pressure interference tests and others. At the same time, advanced analysis of the available field data has a high potential for providing useful findings.

The article shows that in many cases, a simple correlation of water cut with well flow rate can suggest whether the produced water contains an unproductive production due to the presence of behind-the-casing cross-flows from water-saturated formations or water production through the casing leakage.

Conclusions. Based on the results of the presented analysis of well water cut historically, production wells with operational problems and unproductive water production are identified. For these wells, it becomes possible to make decisions on adjusting their production targets, which can help in the case of water coming along dynamically opening and closing fractures in reservoirs with non-standard geomechanics. In addition, based on the results of the analysis, decisions are made on conducting targeted production logging and well-testing, which makes it possible to exclude their conduction in wells without problems which results in significant savings for oil and gas companies. In addition, in a number of cases, based on the results of this analysis, it becomes possible to immediately make decisions of workover planning, which increases the economic efficiency of field development, extends the life of fields and increases reserves final recovery.

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