METHOD FOR OBTAINING SUPERCRITICAL CARBON DIOXIDE IN A WELL FOR EXTRACTION OF HARD-TO-RECOVERY OIL RESERVES Russian patent published in 2023 - IPC E21B43/24 C10L3/00 

FIELD: oil industry.

SUBSTANCE: method for producing supercritical carbon dioxide in a well for extracting hard-to-recover oil reserves includes injecting carbon dioxide into an oil-producing well, consisting of a casing string (10) and a tubing string (11). Preliminarily, the process of obtaining carbon dioxide is carried out on the surface on ground equipment. At the same time, flare - flue gas is captured from the flare installation (1) by means of a gas compressor installation (2), flare - flue gas is supplied to power generation (3) and cogeneration (4) installations to convert the flow of flare - flue gases into electricity and thermal energy. The resulting heat and electricity are fed to the installation (5), based on the Haber process, the output of which is ammonia, carbon dioxide and water. The resulting carbon dioxide is compressed and heated to a critical point. Carbon dioxide is pumped through the wellhead equipment (9) into the tubing string (11) with the valve (12) installed in the lower part and with the plug (13) blocking the annular space, and under the influence of the temperature of the rocks and the discharge pressure, carbon dioxide is brought to supercritical state inside the well. When the required parameters are reached, said valve opens, and the resulting carbon dioxide is pumped into the reservoir.

EFFECT: production of supercritical carbon dioxide in a well for the extraction of hard-to-recover oil reserves with the provision of utilization of flue gas resulting from the combustion of associated gas in flares.

4 cl, 2 dwg