Technology of a formation non-stationary simulation that envisages periodic operation of producing and injection wells in in the antiphase
The experience of use of non-stationary water-flooding technology in the operational sites of Kumkol field revealed that one of its problems is high current water-flooding of the extracted product. The natural evolution of the non-stationary water-flooding technology becomes periodical operation of producing wells (in the antiphase to the injection wells). The results of hydrodynamic calculations, presented in the paper, showed that the non-stationary water-flooding in combination with the periodic operation of producing wells is positively efficient in reservoirs with a wide range of values of permeable heterogeneity. During water-flooding both in the injection and in removal areas due to various reasons (permeable heterogeneity, gravitational separation of phases) there appears some contact surface between the water-flooded and the oil-saturated areas which have different diffusivity. Non-stationary simulation (non-stationary water-flooding + periodic operation) allows to intensify the exchange of fluids between these areas thus ensuring positive technological effect. Of course, the value of this effect is different for permeably heterogeneous and highly heterogeneous reservoirs, i.e. it essentially depends on the value of permeable heterogeneity. Thus, use of water cyclic injection with periodic operation of producing wells in the antiphase allows not only producing additional oil, but also reducing the volume of produced water, which is an important condition of modern Kumkol field development.