Method and apparatus for retorting oil shale at subatmospheric p

Details Method and apparatus for retorting oil shale at subatmospheric p Method and apparatus for retorting oil shale at subatmospheric p

1976-07-30

1978-02-28

Novosad, Stephen J.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

166259, 299 12, E21B 4318, E21B 4324, E21B 4326, E21C 4110

Patent

active

040763129

ABSTRACT:
In a process for retorting oil shale in an situ oil shale retort having a tunnel adjacent the retort, off gas is produced. Leakage of the off gas into the tunnel is prevented by withdrawing off gas from the retort at a rate sufficient to reduce the pressure in the retort adjacent the tunnel to a pressure below the ambient pressure within the tunnel.

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patent: 2911206 (1959-11-01), Purre
patent: 3661423 (1972-05-01), Garret
patent: 3692110 (1972-09-01), Grady

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