Means for providing gas seal in production level drift for in si

Details Means for providing gas seal in production level drift for in si Means for providing gas seal in production level drift for in si

1978-07-17

1980-04-29

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

405 55, E21C 4110

Patent

active

042003369

ABSTRACT:
An in situ oil shale retort is formed in a subterranean formation containing oil shale. The retort contains a fragmented permeable mass of formation particles containing oil shale. During retorting, oxygen-supplying gas is introduced into an upper level of the fragmented mass for establishing a combustion zone and for advancing the combustion zone downwardly through the fragmented mass. Liquid and gaseous products, including shale oil and off gas, are withdrawn from a generally U-shaped production level drift at a lower level of the fragmented mass. Liquid in a lower portion of the U seals against the roof of the drift to provide a gas seal which inhibits passage of off gas from a first leg of the drift in communication with the retort to a second leg of the drift remote from the retort. A retaining wall in the second leg of the drift can provide lateral support for the liquid forming the gas seal, and help minimize the depth of excavation of the U-shaped drift. Shale oil and off gas can be separately withdrawn from the first leg of the drift.

REFERENCES:
patent: 2879646 (1959-03-01), Brandt
patent: 2880593 (1959-04-01), Johnson et al.
patent: 3385067 (1968-05-01), Van Eek
patent: 3917346 (1975-11-01), Janssen
patent: 4007963 (1977-02-01), Ridley

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