METHOD OF OIL FIELD DEVELOPMENT Russian patent published in 2018 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the oil and gas production industry, in particular, to the method of developing oil deposits in late stages of development. Method relates to developing an oil deposit using vertical wells to achieve water cut of 80 %, followed by perforating the transition zone and alternating injection of carbon dioxide and water with the condition of achieving mixing displacement. Initially, the oil column is drilled in the water-oil zone using vertical wells. Wells are perforated in the oil-saturated part of the deposit, then water is injected to maintain reservoir pressure. When 80 % water cut is reached, additional perforations in the transition zone are created in producing and injection wells. At the same time, alternating injection of carbon dioxide and water begins in the wells with the fulfillment of the mixing displacement condition.

EFFECT: proposed method makes it possible to increase the oil recovery of oil fields through the implementation of mixing displacement in the watered and transition zones for the recovery of residual oil depositees.

1 cl, 2 dwg