Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1981-06-26
1984-01-03
Novosad, Stephen J.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
299 13, E21C 0000
Patent
active
044239084
ABSTRACT:
A method for forming a fragmented permeable mass of oil shale particles in an in situ oil shale retort in a subterranean formation containing oil shale is provided. At least one void is excavated within the retort site in the subterranean formation while zones of unfragmented formation are left adjacent such a void. The zones of unfragmented formation are then explosively expanded toward the void for forming the fragmented permeable mass of formation particles in the retort. To provide a fragmented mass with a flat top surface and reasonably uniform void fraction distribution, at least one of the zones of unfragmented formation is explosively expanded toward the void in a plurality of contiguous regions. Each such contiguous region has a free face adjacent the void and is expanded by first explosively expanding a first portion of that region toward the void. The free face of the first portion expanded is near the center of its respective region. Thereafter, a second portion of each region is expanded toward the void. The free face of the second portion is adjacent the free face of the first portion and surrounds the free face of the first portion. Remaining portions of each region are then expanded toward the void in sequence radially outwardly from the next previously expanded portion.
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Novosad Stephen J.
Occidental Oil Shale Inc.
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