Choosing the optimal strategy for residual hard-to-recover oil reserves confined to low-permeability heterogeneous reservoirs extracting

Abstract

The problem considered in the article concerns the oil reserves development complexity from deposits characterized by degraded reservoir porosity and permeability – low permeability and connectivity of reservoirs, high fragmentation, variability, and discontinuity of sand bodies. On the example of one of the facilities with a significant areal distribution, the issue of choosing the development system optimal characteristics based on the production efficiency analysis, as well as the proxy modeling results is studied. As a result, it was found that for the conditions considered, the sealing of the production well grid has a positive effect on the oil extraction process, while maintaining the flooding system rigidity is a prerequisite for maintaining the production efficiency. Optimal for the reserves development of the conditions considered is a system of horizontal producing and directional injection wells. Based on the conclusions made, a technique has been formed for potential sites for the grid compaction, which allows to increase both the degree and the rate of residual reserves productionl. Keywords: low-permeable formations, hard-to-recover reserves, drilling, oil recovery coefficient.