Temporary gas seal for gas level drift of an in situ oil shale r

Details Temporary gas seal for gas level drift of an in situ oil shale r Temporary gas seal for gas level drift of an in situ oil shale r

1980-10-31

1983-01-25

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

299 12, 405144, 98 50, E21C 4110

Patent

active

043700039

ABSTRACT:
A temporary gas seal is provided in a gas level drift of an in situ oil shale retort system which includes a production region having a panel of retorts producing gaseous and liquid products and an adjacent retort preparation region where a panel of in situ retorts is being prepared for production. A portion of the gas level drift is connected to the active retorts for withdrawing off gas while adjacent portions of the gas level drift are being developed. Portions of the gas level connected to the active retorts are temporarily sealed by a gas isolation barrier to isolate workers from toxic off gas. The gas isolation barrier can be a bulkhead with one or more openings each sealed by a remotely removable seal, such as a flexible membrane, or a plate that can be remotely removed or opened to unseal such a bulkhead opening. The procedure of temporarily sealing and thereafter opening newly developed portions of the gas level drift system can be repeated to provide stepwise development of the gas level drift system while retorting is carried out in adjacent production regions of the retort system.

REFERENCES:
patent: 340759 (1886-04-01), Brown
patent: 1804692 (1931-05-01), Jackson
patent: 4023372 (1977-05-01), Presler et al.
patent: 4036024 (1977-07-01), Dreker et al.
patent: 4153299 (1979-05-01), Kvapil et al.

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