FIELD: oil and gas industry.
SUBSTANCE: invention is referred to extraction of light oil and/or fuel out of natural bitumen from oil shale and/or oil-berating sand. According to the method natural bitumen is extracted by water separation from oil shale and/or oil-berating sand with formation of solid residue, volatile hydrocarbons are distilled from natural bitumen, at that insoluble oil coke remains with inclusion of up to 10% of sulphur, gaseous hydrocarbons upon distillation are divided by fractional condensation into light oil, raw oil and different fuels. The method is featured by the fact that solid residue of water separation and/or oil coke are used thermally, at that they are converted by substochiometric oxidation by oxygen-containing gas (26) in counteflow gasifier (19) interacting with movable layer of loose material (21), at addition of alkali substances at temperature <1800°C to gaseous split products with low sulphur content these split products are further converted by substochiometric oxidation to sensible heat, which is used for generation of heated water medium for physical grinding of oil-bearing sand and/or oil shale (A) and/or for separating natural bitumen from rock mass and/or as process heat for thermal breaking of natural bitumen, and by adding alkali substances at reductive conditions gaseous sulphur-containing products produced in counterflow gasifer (19) are converted at temperature of more than 400°C from ingredients of carbon- and sulphur-containing residues by chemical reaction with alkali substances to solid sulphur-containing compounds, and these solid sulphur-containing compounds are treated at least partially by gaseous products of the reaction and removed from gaseous phase by separating fine-grain materials at temperature higher than 300°C.
EFFECT: improved energy balance, prevented threat to environment.
13 cl, 2 dwg
