METHOD OF INCREASING OIL RECOVERY OF FORMATIONS Russian patent published in 2024 - IPC E21B43/20 E21B43/22 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry. Method of increasing oil recovery of formations involves pumping of displacement agent – water with viscosity of 1 mPa⋅s up to 2 mPa⋅s, through injection wells and fluid extraction through production wells. At the same time parameters of formations of the productive horizon are determined and a section for action is selected taking into account certain parameters of the formation. Determining primary value of compensation of fluid withdrawals by pumping, then, displacement agent with viscosity exceeding that of previous displacement agent – water and making at least 0.5 of oil viscosity in volume of not less than 10 m³ per 1 meter of formation – is pumped in selected section. Then water with viscosity of 1 mPa⋅s up to 2 mPa⋅s, wherein the pumping volume is selected with the possibility of compensation of fluid withdrawals by pumping along the treated section in range from 75% to 115% of the primary value of compensation of liquid withdrawals by pumping, but not less than 70% of the volume of the sampled liquid in the section with duration of at least 15 days.

EFFECT: increasing oil recovery of formations is ensured.

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