RECOVERY METHOD OF OIL-SOURCE FIELDS Russian patent published in 2017 - IPC E21B43/16 

FIELD: petroleum industry.

SUBSTANCE: invention refers to the petroleum industry. The recovery method of oil-source fields includes selection of oil field, oil-source deposits of which has average absolute permeability of 2 mD. Either already drilled wells or the new wells to drill may be used. All wells should be production wells. A well is switched to pumping of operation agent after completion of a condition in one of the wells q_l < 0.3·q_l⁰ where P_b < 0.3·P_for⁰, where q_l is the current liquid rate of a well, q_l⁰ is the initial liquid rate after commissioning of a well before corresponding withdrawal cycle, P_b is the current bottom hole pressure, P_for⁰ is the initial formation pressure. Carbon dioxide (CO₂) is used as the operation agent, pumping of which is performed with gradual increasing of consumption from 0 to q_pump^max, where q_pump^max is the maximum consumption of CO₂ at the pumping pressure of P_pump = (0.8-1.0)·P_rock, where P_rock is the vertical rock pressure. After achieving q_pump^max, the pumping stops, and the well stop either for redistribution of pressure in the reservoir for 10-100 days long, after that, the well may be commissioned into production, the cycles of the pumping and withdrawal are repeated. The same operations should be performed in all wells of the oil field.

EFFECT: technical result lies in the increasing of oil production from oil-source fields.

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