Method for forming an in situ oil shale retort

Details Method for forming an in situ oil shale retort Method for forming an in situ oil shale retort

1980-10-28

1983-01-11

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

102312, 299 13, E21C 4110

Patent

active

043679013

ABSTRACT:
An in situ oil shale retort is formed in a subterranean formation containing oil shale, a horizontally extending void is excavated within the boundaries of the retort site leaving a zone of unfragmented formation above and/or below such a void. A crack is propagated in at least one of the zones of unfragmented formation along the side boundaries of the retort site and thereafter the zone of unfragmented formation is explosively expanded towards such a void for forming a fragmented permeable mass of formation particles in the retort. Such a fragmented permeable mass is retorted in situ to produce shale oil.

REFERENCES:
patent: 1195781 (1916-08-01), Clark
patent: 3466094 (1969-09-01), Haworth et al.
patent: 4025115 (1977-05-01), French et al.
Blasters Handbook, DuPont, 15th Edition, pp. 412-419.
Swedish Blasting Technique by Rune Gustafsson, Pub. by SPI, Sweden, (no date).
Garrett Research Internal Memo, by R. Ridley, Sep. 27, 1974.

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