Methodology for express definition of water inflow source in water-flooded wells operating multi-layer deposits by high-precision studies of water composition

© 2020 Saint Petersburg 2020 - Geosciences: Converting Knowledge into Resources. All rights reserved. An important problem in field development is the high water cut of the production. This problem is very important in fields at a late stage of development, when the number of water-flooded wells increases while oil production decreases. Determination of the source of water incoming to production wells and possible problems in the well bore due to annular circulation or breakthroughs of water from aquifers or from injection well, is one of the most important tasks in the development of multilayer deposits. Today, many methods are used to detect these problems, but all of them require shutting down the well and launching special equipment, which is sometimes a time-consuming process in view of the construction features of the wells and is characterized by a significant delay in detection time. The approach proposed in the work is based on the analysis of the results of a study of the geochemical composition of produced water, which is unique for horizons of different age. The relevance of the work is caused by the lack of available operational methods for obtaining information about the water inflow sources, which prevents the effective development of multilayer deposits