Improving the efficiency of putting oil deposits with hard-to-recover reserves of Western Siberia into development

Abstract

The article shows that reservoirs of various genesis generalization into one petrophysical model using core intervals with the best filtration-capacitance properties leads to an overestimation of boundary values and a decrease in the resource potential of thin-layered and low-permeable facilities. Additional core sampling and dependencies revision using radioactive logging methods allowes us to take a fresh look at the facility, at the same time, the initial geological reserves increase by more than half and justify the status of hard-to-recover reserves, thereby increasing its attractiveness for commissioning initial geological reserves by more than half and justifying the status of hard-to-recover reserves, thereby increasing its development attractiveness. To improve the technical and economic assessment, the transition to a development system based on horizontal wells with multi-stage hydraulic fracturing was justified, and the optimal parameters for the well grid density, their completion, and the reservoir pressure maintenance system organization were determined. The use of the recommendations makes it possible to increase the oil recovery factor and the net present value of the project by more than two times compared to the baseline approved option. Keywords: hydraulic fracturing; hard-to-recover reserves; geomechanical model; development efficiency improvement; shale; low permeable reservoir.