Triangular blasting into limited voids for vertical free face re

Mining or in situ disintegration of hard material – Tunnel recovery of fluid material

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102 23, 299 13, E21C 4110

Patent

active

042629659

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, the retort is formed by excavating a narrow vertical slot diagonally across a retort site of rectangular horizontal cross-section, leaving separate triangular zones of unfragmented formation within the retort site on opposite sides of the diagonal slot. Explosive is placed in a plurality of vertical blasting holes drilled in each triangular zone of formation, and such explosive is detonated for explosively expanding formation within the triangular zones toward vertical free faces adjacent the slot for forming a fragmented permeable mass of formation particles containing oil shale. Detonation of explosive in the blasting holes expands separate wedge-shaped segments of formation toward the diagonal slot, owing to the natural cratering effect of each blast, causing the wedge-shaped segments being expanded to conform generally to the side boundaries of each triangular zone, and producing reasonably good fragmentation and movement of expanded formation toward the slot from formation throughout the retort site. Several such slots can be employed in forming a retort.

REFERENCES:
patent: 4043595 (1977-08-01), French
patent: 4043596 (1977-08-01), Ridley

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