Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1980-03-17
1982-02-16
Purser, Ernest R.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
299 19, 405132, E21C 4110, E21D 1110
Patent
active
043156576
ABSTRACT:
A gas seal is provided in an access drift excavated in a subterranean formation containing oil shale. The access drift is adjacent an in situ oil shale retort and is in gas communication with the fragmented permeable mass of formation particles containing oil shale formed in the in situ oil shale retort. The mass of formation particles extends into the access drift, forming a rubble pile of formation particles having a face approximately at the angle of repose of fragmented formation.
The gas seal includes a temperature barrier which includes a layer of heat insulating material disposed on the face of the rubble pile of formation particles and additionally includes a gas barrier. The gas barrier is a gas-tight bulkhead installed across the access drift at a location in the access drift spaced apart from the temperature barrier.
REFERENCES:
patent: 1269747 (1918-06-01), Rogers
patent: 3302343 (1967-02-01), Bear
patent: 3583165 (1971-06-01), West
patent: 4007963 (1977-02-01), Ridley
patent: 4027917 (1977-06-01), Bartel et al.
patent: 4106814 (1978-08-01), French
patent: 4133580 (1979-01-01), French
Occidental Oil Shale Inc.
Purser Ernest R.
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