METHOD OF EXTRACTION OF HIGH VISCOSITY OIL FROM CARBONATE COLLECTORS Russian patent published in 2009 - IPC E21B43/22 

FIELD: mining.

SUBSTANCE: according to method of extraction of high viscosity oil before pressurising of replacing agent into carbonate collector following is pumped: saturated water solution of ammonium chloride in volume 0.08 of void volume, then spacer fluid - 5% solution of sodium chloride in volume equal 2-3 m of height of pump-compressor pipes, after that 35-40% water solution of formalin in volume 0.07 of void volume is added, then solution of catalyst - sodium or potassium hydroxide at amount of 7% from volume of preliminary supplied liquid, which is pressurised into collector by means of acetate spacer in volume equal 2-3 m of height of pump-compressor pipes, then 30% hydrogen peroxide in volume of 0.1 of void volume, acetate spacer in volume equal 2-3 m of height of pump-compressor pipes, then 5% solution of manganese as catalyst of hydrogen peroxide pumped into formation with replacing agent supplied in volume equal to one volume of pump-compressor pipes; then holding is carried out and pumping of replacing agent is commenced with simultaneous withdrawal of oil from producing wells.

EFFECT: upgraded efficiency of method.