METHOD OF DEVELOPING DEPOSITS OF HIGH- AND SUPER-HIGH VISCOSITY OIL Russian patent published in 2012 - IPC E21B43/24 C09K8/592 

FIELD: oil and gas industry.

SUBSTANCE: proposed method comprises injecting steam into bed, heating said bed by steam chamber, combined injection of steam and hydrocarbon solvent into injection well with maintaining steam chamber temperature not lower that that of steam-hydrocarbon solvent phase transition. Then, product is extracted from production well. Water solution of 20-40%-carbamide is injected in amount of 12-15 t per 100 m oh horizontal well borehole in proportion with steam of 8:1. Then, steam is injected unless bed temperature makes 150°C. Now, steam with hydrocarbon solvent is injected. Amount of hydrocarbon solvent is selected proceeding from the formula: where m is coefficient of porosity, unit fractions; L is length of the bed working area (isolated on the basis of geophysical research), m; H is steam chamber height, m. Hydrocarbon solvent with steam injected, started in steam injection unless production well yield reduced to magnitude preceding the beginning of deposit processing by carbamide and hydrocarbon solvent solutions with steam in given well. Thereafter, deposit is periodically repeated unless increase in yield is 10% smaller than aforesaid magnitude.

EFFECT: increased steam-gravity effects and bed recovery.

1 dwg