METHOD FOR DEVELOPING A HIGH-VISCOSITY OIL OR BITUMEN FIELD WITH GAS INJECTION Russian patent published in 2022 - IPC E21B43/24 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry and can be used in the development of deposits of high-viscosity oil or bitumen. A method for developing a high-viscosity oil or bitumen field with gas injection includes placing horizontal steam-cyclic wells on the periphery of the field, placing paired horizontal injection and production wells in the central part of the field, locating temperature and pressure control devices in horizontal production wells, injecting steam at an early stage of development in horizontal steam-cyclic and paired horizontal injection and production wells for warming up the productive formation, stopping the supply of steam for thermocapillary impregnation, then the transfer of horizontal production wells for production extraction, horizontal injection wells - for steam injection, operation of horizontal steam-cyclic wells in cycles - sequential steam injection and production extraction. At the stage of growth of the steam chamber, the operating parameters of the production well are determined - the liquid flow rate, the water cut of the produced product and the temperature of the liquid, pairs of horizontal injection and production wells are isolated with the production well operating parameters unchanged or varying within no more than 8% during the month of operation. Joint injection of gas with steam at a concentration of 0.5 m³ of gas to 1 m³ of steam is initiated into the selected paired injection wells. Methane or carbon dioxide is used as the gas. The development is continued, while repeating the above operations for separating pairs of horizontal injection and production wells with unchanged or changing within no more than 8% operating parameters of the production well during the month of operation and joint injection of gas with steam.

EFFECT: increasing the efficiency of developing a high-viscosity oil or bitumen field by increasing oil recovery by reducing the viscosity of oil and increasing its mobility when gas is dissolved in it, increasing the coverage of the reservoir by development due to the lateral expansion of the steam chamber and a corresponding increase in the oil recovery factor, reducing the volume of generated steam and partial replacement with gas, as well as expanding the technological capabilities of the development method through the use of associated gas - methane or CO₂, which is formed in the process of steam generation at boiler plants.

1 cl, 1 dwg