Pressure swing recovery system for oil shale deposits

Mining or in situ disintegration of hard material – In situ conversion of solid to fluid – Dissolving or chemical reaction

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166259, 166303, E21C 4110

Patent

active

040593088

ABSTRACT:
A process for the in-situ recovery of hydrocarbon, carbon monoxide, and hydrogen values and associated minerals from subsurface oil shale deposits is provided by forming a gas-tight retort chamber and injecting it with various process gases which are pressure cycled over a predetermined period of time. This pressure cycling increases the extraction efficiency by improving the recovery of material contained in blind cracks in the underground formation, and by provising an independent means of controlling the thermal gradients induced in the deposit.

REFERENCES:
patent: 3273640 (1966-09-01), Huntington
patent: 3502372 (1970-03-01), Prats
patent: 3753594 (1973-08-01), Beard
patent: 3759328 (1973-09-01), Ueber et al.
patent: 3759574 (1973-09-01), Beard
patent: 3779601 (1973-12-01), Beard
patent: 3957306 (1976-05-01), Closmann

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