Regulation of productive layers and increase the inflow of fluid from the reservoir

Abstract

Background Every year the global structure of hydrocarbon reserves grows in reserves, confined to fields containing hard-to-recover reserves, this trend is also observed in Russian Federation. A significant share in the hydrocarbon reserves structure accounts for small fields with high-viscosity oil, confined to carbonate sediments, complex. More than half of the hydrocarbon reserves in Russia are hard-to-recover reserves: high-viscosity oil, natural bitumen, deposits in low-permeability formations, residual reserves, deep horizons, sub-gas zones, watered zones with residual oil. In large fields, oil production rates close to the design levels were achieved, while oil extraction is complicated by deposits of asphalt-resinous substances, paraffins, salts; hydrogen sulfide release; sand removal; high degree of heterogeneity and low permeability of collectors containing oil reserves. Aims and Objectives To investigate the phenomenon of intra-layer and downhole fluid flows. Taking into account the differences in the conditions in these layers, suggest a way to intensify the flow of fluid from the reservoir into the well. Methods Analytical and field studies, field tests. Results Calculations were performed according to the developed algorithm. Analysis of the calculation results allowed us to identify the groups of inter-affecting interlayers, the geometry of the discharged zone; to determine the necessary degree of increase in permeability of the bottomhole formation zone. By increasing the density of perforation openings opposite to any interlayer, the inflow from it can be increased. It is revealed that the depth of the skin zone is important along with the increase in permeability. The calculated number of perforation holes increases the permeability of the reservoir - well interface, but the depth of the channels may be insufficient compared to the required distance, which obviously explains the insufficient increase in the productivity of the well. Conclusion The proposed method can be one of the tools to intensify the in-flow of fluids (including oil and gas) from the reservoir to the well and increase oil and gas production. The expected effect can be predicted on the basis of the reduced algorithm. With a correct prediction of the effect of the event, it is possible to carry out the secondary formation opening more rationally, therefore, subsequently, some geological and technical measures will be unnecessary in the operation of wells.