DEVELOPMENT METHOD OF SUPER-VISCOUS OIL DEPOSIT Russian patent published in 2020 - IPC E21B43/22 E21B43/24 C09K8/592 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to the oil-producing industry. Method of super-viscous oil deposit development includes successive pumping of steam into formation with creation of steam chamber, fringe of 5–30 % aqueous solution of carbamide, process pause of 2–5 hours duration, pumping of hydrocarbon solvent rim and extraction of product. Volume of fringe of water solution of carbamide is calculated by formula V_sol = (0.1÷0.4)⋅V_o/V_CO2fc , where (0.1 ÷0.4) is coefficient, which is selected based on well injection capacity; V_o is volume of produced oil, m³; V_CO2fc is volume of carbon dioxide released in formation conditions, m³. Volume of rim of injected liquid hydrocarbon solvent is calculated by formula V_S(l) = (0.1÷0.4)⋅0.53·V_o/Caf, where (0.1÷0.4) is coefficient, which is selected based on well injection capacity; 0.53 is coefficient characterizing the ratio of the volumes of liquid and vaporized solvent; V_o is the amount of oil produced, m³; Caf is content of aromatic fraction in solvent, %.

EFFECT: technical result is high efficiency of steam-thermal action during development of super-viscous oil deposit, elimination of irrational flow of heat carrier, carbamide solution and hydrocarbon solvent, reduced corrosion of oil equipment, reduced material costs.

1 cl, 2 tbl, 1 ex