Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1979-11-02
1981-12-01
Purser, Ernest R.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
299 13, 299 19, E21C 4110
Patent
active
043032737
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 and has a production level drift in communication with a lower portion of the fragmented mass for withdrawing liquid and gaseous products of retorting during retorting of oil shale in the fragmented mass. The principal portion of the fragmented mass is spaced vertically above a lower production level portion having a generally T-shaped vertical cross section. The lower portion of the fragmented mass has a horizontal cross sectional area smaller than the horizontal cross sectional area of the upper principal portion of the fragmented mass above the production level.
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Occidental Oil Shale Inc.
Purser Ernest R.
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