METHOD FOR DEVELOPMENT OF OIL DEPOSIT USING INJECTION OF CARBON DIOXIDE Russian patent published in 2019 - IPC E21B43/24 E21B47/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to production of oil and can be used in methods of development of deposits with carbonate and terrigenous reservoirs containing high-viscosity oil, as well as deposits with low gas factor. Method for development of oil deposit using injection of carbon dioxide involves preparation of working agent, pumping of working agent through injection wells and extraction of extracted products through production wells with further separation of oil and associated gas. Method comprises preliminary determination of chemical composition of formation, measuring formation temperature, pressure, selected formations consisting of carbonate or terrigenous rocks with carbonate cement, with formation temperature of 31 °C and more and formation pressure from 7.38 MPa and more. During preparation of working agent, simultaneously with fuel supply, water and atmospheric air are supplied to steam generator. Obtained mixture of carbon dioxide and steam is fed into a heat exchanger. Steam is removed from the mixture. Further, the carbon dioxide gas obtained from the heat exchanger is simultaneously supplied with oxygen, fuel and water into the steam generator at a ratio of carbon dioxide to oxygen of 4:1 and a ratio of fuel to the mixture of carbon dioxide and oxygen of 1:12, respectively. On the return line combustion products are directed through the heat exchanger in the amount required to maintain the ratio of carbon dioxide and oxygen. Steam is removed from combustion products. Then, combustion products without steam are directed into steam generator, and remaining volume of combustion products is mixed with water vapor in mixer to produce working agent and pumped into injection well. Fuel used is a mixture of hydrocarbon part of associated gas and gas from the supplier, wherein the amount of the mixture of hydrocarbon portion of associated gas and gas from the supplier is varied depending on the volume of associated gas coming from the gas separator.

EFFECT: higher reliability and efficiency of the method, higher quality of fuel combustion in the oxidizer, elimination of heat loss of fuel combustion products, higher temperature of fuel combustion, higher level of environmental safety of the oil production area, control of emissions of polluting hazardous substances.

1 cl, 1 dwg