Method for explosively expanding a pillar for forming an in situ

Details Method for explosively expanding a pillar for forming an in situ Method for explosively expanding a pillar for forming an in situ

1979-11-07

1981-09-22

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

102311, 299 13, 166259, E21C 4110

Patent

active

042906490

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, at least one pillar of unfragmented formation is left within the side boundaries of such a void for providing temporary support for overburden above the void, such a pillar is explosively expanded so that a principal portion of the pillar fragments travel to the side boundaries of the void and such a zone of unfragmented formation is explosively expanded toward the void. Accumulation of sufficient pillar fragments adjacent the side boundaries of the retort can substantially offset a tendency for fragments of the expanded zone of formation to form a mound thereby forming a fragmented permeable mass of formation particles within the retort with a reasonably flat upper surface. Such a fragmented permeable mass is retorted in situ to produce shale oil.

REFERENCES:
patent: 3316020 (1967-04-01), Bergstrom
patent: 3434757 (1969-03-01), Prats
patent: 3661423 (1972-05-01), Garrett
patent: 3917346 (1975-11-01), Janssen
patent: 3980339 (1976-09-01), Heald et al.
patent: 4043597 (1977-08-01), French
patent: 4043598 (1977-08-01), French et al.
patent: 4146272 (1979-03-01), French
patent: 4153298 (1979-10-01), McCarthy et al.

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