Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1977-04-25
1978-10-03
Novosad, Stephen J.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
166259, 299 13, 102 23, E21B 4324, E21C 4110
Patent
active
041180712
ABSTRACT:
An in situ oil shale retort is formed in a subterranean formation containing oil shale. The retort with top, bottom and side boundaries contains a fragmented permeable mass of particles containing oil shale. A base of operation is excavated at a working level in the formation. Means are excavated through the formation for access to a location underlying the base of operation. In one embodiment, a void in the form of a vertical slot is excavated in the site between the means for access and an elevation below the bottom of the base of operation, leaving a remaining portion which is to be expanded toward the void. This is designed to leave a horizontal sill pillar of intact formation between the top of the void and the bottom of the base of operation with a vertical thickness sufficient to maintain a safe base of operation after explosive expansion of formation to form the fragmented permeable mass of particles. The void provides at least one free face extending vertically through the formation within the boundaries of the in situ oil shale retort site. This remaining portion is explosively expanded toward the void with a single round of explosions.
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Anonymous, Article in "SYNTHETIC FUELS", Cameron Engineers, Inc., Jun., 1975, pp. 2-21 to 2-24.
Novosad Stephen J.
Occidental Oil Shale Inc.
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