The main oil fields of the Surgut dome got to final stage of development. The project well fund is practically fully implemented, and oil production levels are maintaining through the use of geological and technical measures. Improving the effectiveness of wellwork planning depends on reliability of determining the structure of current recoverable oil reserves. This problem is solved by performing calculations with using 3D hydrodynamic models. The Tyumen branch of SurgutNIPIneft annually performs a significant number of laboratory studies of residual oil saturation and oil displacement ratio. The experience gained makes it possible to generalize the results of the core studies for various oil reservoirs of the Surgut dome. As a result of the generalization of the primary core studies, the dependence of residual oil saturation on the initial oil saturation and porosity was obtained. The proposed method of substantiating the residual oil saturation was compared with others ones used in the industry. In most cases, the method allows to get a higher convergence with laboratory studies, and therefore a higher reliability of determining the residual oil saturation. The resulting dependence has become widespread, since it takes into account reservoir properties and is characterized by a higher coefficient of determination. This makes it possible to reliably solve the problems of modeling field development, determining the structure of residual reserves and planning successful activities. The proposed approach to substantiate the displacement efficiency can be used along with other well-known dependencies in the preparation of oil field development projects.
References
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