The article presents the results of research conducted in terms of the differentiation of associated petroleum gas production into dissolved gas and breakthrough gas of gas caps. This task is important for the correct management of the balance of reserves and is associated with the solution of a number of methodological problems in the conditions of uncertainty of the initial data. In the work were analyzed well-known techniques and approaches to the differentiation of associated gas production, and their applicability in the conditions of the fields of RN-Purneftegas LLC was considered. Taking into account the noted advantages and disadvantages of the known approaches was chosen a technique based on the hydrodynamic modeling of the real processes of the development of the RN-Purneftegas fields. The reliability of the differentiation of produced gas for dissolved gas and gas cap gas is determined by the correct modeling the processes of liberation of dissolved gas from reservoir oil while reducing reservoir pressure and the formation of gas cones. The quality of the model setting is estimated by the technological indicators of the field development, obtained as a result of measuring flow rates, well tests, sampling and laboratory analysis of formation fluid samples. The high degree of the model matching suggests that the parameters of the reservoir during the model adaptation were chosen correctly. As a result were found the parameters related by functional dependence with the value of the model gas-oil ration by the method of regression analysis. The method based on the regression was developed for the differentiation of associated gas production wich is applicable to the fields of RN Purneftegas. The article reflects the main tasks that were solved in the course of the work, and the obtained results.
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