Ways to achieve the potential of recoverable reserves of mature fields based on improving the efficiency of the well stock

Introduction. The article is devoted to the problems of reducing annual oil production levels and a negative trend in the oil recovery factor in Russia and the Khanty-Mansiysk Autonomous District. With the increase in drilling volumes, there is a decrease in the average oil production rate, which indicates a deterioration in the quality of the productive reserves. There are the field maturation, deterioration of the structure of residual reserves and an increase in the share of hard-to-recover reserves that are affected. A promising direction for increasing the profitability of field development and operation is the systematic use of technologies for physical-chemical methods and hydrodynamic EOR, which do not require significant capital investments due to the existing production and social infrastructure on current assets.

The aim. To show the need for a systematic and scientifically based application of EOR and well intervention as one of the important areas of energy sector development in the medterm.

Materials and methods. The paper is based on the analysis of the dynamics and depletion of reserves, calculation of the increase in recoverable reserves, and the results of technological and economic effects from the implementation of various technologies for physical-chemical methods and hydrodynamic EOR. The objects of research are the deposits of the Megion group, which are at the III and IV stages of development.

Results. The necessity of using physical-chemical methods and hydrodynamic EOR is substantiated in order to stabilize the level of oil production, reduce the rate of waterflooding, increase recoverable oil reserves, and reduce operating costs. There are considered the physical-chemical methods and hydrodynamic EOR in terms of ease of implementation, technological efficiency and early payback. The results of using various EOR technologies at the deposits of PJSC Slavneft-Megionneftegaz based on system-targeted approaches are shown.

Conclusion. It is shown that the implementation of physical-chemical methods and hydrodynamic EOR based on the system-targeted approaches on the reservoir in conditions of low permeable reservoirs and high water cut wells contributes to an increase in the efficiency of developing hard-to-recover reserves, increasing oil production and stabilizing the water content of deposits.

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