FIELD: oil and gas industry.
SUBSTANCE: method for displacing tertiary oil includes geological exploration of a high-, medium- and low-permeability oil reservoir, displacing secondary oil while maintaining in-situ energy by injecting water into the reservoir. Associated petroleum gas obtained directly in the process of secondary oil production is collected. Supercritical associated petroleum gas is produced. Supercritical associated petroleum gas is supplied to low-permeability reservoirs of the same field to carry out tertiary oil production and parallel displacement of oil within the framework of secondary and tertiary oil production, which is carried out through the reduction of flows of displaced oil to adjacent product wells.
EFFECT: increase in oil recovery (increase in oil recovery factor) of the field to 30-60%.
3 cl, 3 dwg, 1 tbl
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