Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1980-04-18
1982-10-12
Purser, Ernest R.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
102312, 299 13, E21C 4110
Patent
active
043535984
ABSTRACT:
A fragmented permeable mass of formation particles is formed in an in situ oil shale retort in a subterranean formation containing oil shale. Formation is excavated to form a horizontally extending void in the subterranean formation and a support pillar of unfragmented formation is left in the void for supporting overlying unfragmented formation. The support pillar is prepared for explosive expansion by forming an array of explosive charges along the centerline of the pillar between its opposed free faces. The amount of explosive on each side of the centerline is about equal. Explosive is then detonated in the support pillar for expanding the pillar about equally toward both opposed free faces. Thereafter, explosive is detonated in unfragmented formation above and/or below the void for explosively expanding the formation toward the void to form the fragmented permeable mass of formation particles.
REFERENCES:
patent: 3661423 (1972-05-01), Garrett
patent: 3917346 (1975-11-01), Janssen
patent: 3917348 (1975-11-01), Janssen
patent: 3980339 (1976-09-01), Heald et al.
Occidental Oil Shale Inc.
Purser Ernest R.
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