VISCOUS OIL PRODUCTION METHOD Russian patent published in 2014 - IPC E21B43/24 E21B43/22 

FIELD: oil and gas industry.

SUBSTANCE: in the viscous oil production method in order to form a catalyst bed at a bottomhole with permeability at least equal to the permeability of the bottomhole formation zone, clay drilling mud is injected preliminarily to the bottomhole formation zone, at that the mud comprises clay particles - a catalyst of hydrogen peroxide decomposition and sand particles, which ensure permeability of the catalyst bed or a suspension of the mix containing by wt %: catalyst of hydrogen peroxide - powder of two- or three- or four-valence metal oxide -20-50, sand or proppant - the remaining part. Then injection is made to the formation simultaneously of 10.0-50.0% of an aqueous solution of hydrogen peroxide and 1.0-30.0% of an aqueous solution or a suspension of bicarbonate alkali metal and/or ammonium bicarbonate, and then a water buffer is injected from the formation pressure maintenance system with subsequent oil pumping out.

EFFECT: increasing the extraction degree of viscous oil.

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