Blasting to a horizontal free face with mixing of fragments

Details Blasting to a horizontal free face with mixing of fragments Blasting to a horizontal free face with mixing of fragments

1980-10-24

1982-04-27

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

102312, 299 13, E21C 4110

Patent

active

043267513

ABSTRACT:
An in situ oil shale retort is formed in a subterranean formation wherein the oil shale retort contains a fragmented permeable mass of formation particles containing oil shale. A limited void is formed in the subterranean formation and zones of unfragmented formation are left above and below the void and are loaded with explosive for explosively expanding unfragmented formation toward the void. The explosive is placed into the zones of unfragmented formation for forming a substantially horizontal array of main explosive charges and at least one substantially horizontal array of satellite explosive charges. Each of the satellite explosive charges has a scaled point charge depth of burial substantially equal to the scaled point charge depth of burial of each of the main explosive charges and the actual depth of burial of each of the satellite explosive charges is less than the actual depth of burial of each of the main explosive charges. Explosive is detonated in the blastholes in a single round of explosions for explosively expanding at least one of the zones of unfragmented formation toward the void to form a fragmented permeable mass of formation particles containing oil shale in the oil shale retort.

REFERENCES:
patent: 4043595 (1977-08-01), French
patent: 4109964 (1978-08-01), Ridley
patent: 4146272 (1979-03-01), French
patent: 4192554 (1980-03-01), Ricketts
patent: 4238136 (1980-12-01), Ricketts
Redpath "Application of Cratering Characteristics to Conventional Blast Design".

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