Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1980-11-21
1983-01-04
Purser, Ernest R.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
102312, 299 13, E21C 4110
Patent
active
043669875
ABSTRACT:
A method for forming a fragmented permeable mass of formation particles in an in situ oil shale retort is provided. A horizontally extending void is excavated in unfragmented formation containing oil shale and a zone of unfragmented formation is left adjacent the void. An array of explosive charges is formed in the zone of unfragmented formation. The array of explosive charges comprises rows of central explosive charges surrounded by a band of outer explosive charges which are adjacent side boundaries of the retort being formed. The powder factor of each outer explosive charge is made about equal to the powder factor of each central explosive charge. The explosive charges are detonated for explosively expanding the zone of unfragmented formation toward the void for forming the fragmented permeable mass of formation particles having a reasonably uniformly distributed void fraction in the in situ oil shale retort.
REFERENCES:
patent: 3466094 (1969-09-01), Haworth et al.
patent: 4025115 (1977-05-01), French et al.
Blasters' Handbook, DuPont, 1969, 15th Edition, pp. 408-420.
Swedish Blasting Technique SPI, Sweden, 1973, pp. 163-180.
Fernandes Robert J.
Ricketts Thomas E.
Occidental Oil Shale Inc.
Purser Ernest R.
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