Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1978-11-13
1980-07-01
Novosad, Stephen J.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
166259, 102 23, 299 13, E21B 4324, E21C 4110
Patent
active
042103665
ABSTRACT:
Oil shale formation is explosively expanded toward a limited void volume for forming an in situ oil shale retort in a subterranean formation containing oil shale. In one embodiment, a void in the form a narrow vertical slot is excavated within a retort site, leaving at least one portion of unfragmented formation within the retort site adjacent a vertical free face of the slot. Explosive is placed in a row of vertical blasting holes in the remaining portion of unfragmented formation adjacent the vertical free face. The blasting holes are mutually spaced apart along the length of the slot, and the row of blasting holes extends generally parallel to the vertical free face. Explosive in the blasting holes is detonated in a time delay sequence starting near one end of the slot and progressing along the length of the slot for explosively expanding formation in the remaining portion of unfragmented formation toward the vertical free face for forming a fragmented permeable mass of formation particles containing oil shale in an in situ oil shale retort.
REFERENCES:
patent: 2481051 (1949-09-01), Uren
patent: 3434757 (1969-03-01), Prats
patent: 3661423 (1972-05-01), Garrett
patent: 4022511 (1977-05-01), French
patent: 4043595 (1977-08-01), French
patent: 4118071 (1978-10-01), Hutchins
patent: 4146272 (1979-03-01), French
Hutchins Ned M.
Ridley Richard D.
Novosad Stephen J.
Occidental Oil Shale Inc.
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