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

FIELD: oil and gas industry.

SUBSTANCE: in viscous oil production method in order to form a bottomhole catalytic bed with permeability at least equal to permeability of the bottomhole formation zone water suspension of clayey drilling cuttings is injected preliminary to the bottomhole formation zone, at the suspension contains clay particles which serve as a catalyst for decomposition of hydrogen peroxide and sand particles which ensure permeability of the catalytic bed, or water suspension is used of the mixture of hydrogen peroxide decomposing catalyst, for which purpose a powder of two-, three- or four-valent metal oxide and sand or proppant is used. Then 10-40% solution of hydrogen peroxide, water buffer and solution of non-ionic surface active compound - deemulsifier are injected in sequence to the formation. Then water is supplied from the system to maintain the formation pressure and oil is extracted.

EFFECT: increasing viscous oil extraction efficiency.

2 tbl, 4 ex