OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2024 - IPC E21B43/17 E21B43/30 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular to methods of oil deposit development. Method of oil deposit development includes drilling of injection and directional production wells, pumping of displacement agent through injection well and production of deposit through production wells. During construction of production wells, a complex of detailed geophysical surveys (GIS) is carried out, in which nuclear-magnetic logging is included, based on the GIS data interpretation, the oil viscosity profile is plotted for wells and a section of low-mobile oil is identified. In the dome part of the selected section of low-mobile oil, a horizontal injection well is drilled with the length of the horizontal section of at least 250 m. Further, directional production wells are drilled with zenith angle of 65–80° along the perimeter inside the selected section of the low-mobile oil deposit, wherein directional production wells are located at equal distance from horizontal injection well. Initial formation pressure in the formation is measured and oil samples are taken. Then, injection of carbon dioxide through the horizontal injection well is started until the formation pressure in the formation is higher by 5 % of the initial formation pressure, after which injection is stopped and production is carried out from directional production wells.

EFFECT: ensures an increase in the oil recovery factor in areas of the deposit with low-mobile oil.

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