INTERBEDDING COMBUSTION WITH REDUCED CO EMISSIONS Russian patent published in 2015 - IPC E21B43/243 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is referred to extraction of hydrocarbon mixture and, in particular, mixture of heavy hydrocarbons from subsurface by interbedding combustion using gas enriched with oxygen. Peculiarity of these inventions consists in entrainment of at least a part of CO₂ from enriched CO₂ gases generated in combustion process. The method as a part of these inventions includes the following: (i) injection of gas enriched with oxygen to the specified bed; (ii) combustion of gas enriched with oxygen in the specified bed with resultant increase of temperature, reduced viscosity for the above mixture of hydrocarbons and generation of enriched CO₂ gas; (iii) extraction of the above heated mixture of hydrocarbons and deasphalting of the above mixture at deasphalting unit with production of deasphalted hydrocarbons and asphaltenes; (iv) combustion of the above asphaltenes produced in the above deasphalting unit in process of oxidating combustion with production of steam, energy and enriched CO₂ gas; (v) entrainment of at least a part of CO₂ of the above enriched CO₂ gas.

EFFECT: increasing efficiency of heavy hydrocarbons extraction with reduced CO₂ emissions to the atmosphere.

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