FIELD: oil and gas production.
SUBSTANCE: here is disclosed procedure for extraction of hydrocarbons out of hydrocarbon containing stock, such as coal, boghead coal, pyro-shale, oil-bearing sand rock, natural bitumen, bituminous rock, and residual oil products. The procedure consists in contacting said stock with carbon dioxide. Also, modes of overcritical and pre-critical states of CO2 are alternately changed. Owing to that, the process of extraction progresses at lower pressure within the range of 55-90 at and temperature in the range of 20-40°C. The process is characterised with higher selectivity to hydrocarbons dissolution.
EFFECT: processing stock with low contents of hydrocarbons and increased efficiency of complex treatment of hydrocarbon containing stock.
3 ex, 1 dwg
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