Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1977-07-15
1979-01-09
Novosad, Stephen J.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
299 11, 299 13, 299 19, E21C 4110, E21F 1500
Patent
active
041335805
ABSTRACT:
A row of horizontally spaced apart in situ oil shale retorts is formed in a subterranean formation containing oil shale. Each row is formed by excavating at least a pair of upper and lower retort access drifts at elevations within the top and bottom boundaries of the retort sites. The access drifts extend through opposite side boundaries of a plurality of retorts in such row. Each retort is formed by excavating upper and lower horizontal voids at the levels of the upper and lower retort access drifts, respectively, such voids being excavated laterally from the access drift within the side boundaries of the retort sites. Each retort is formed by explosively expanding formation toward the upper and lower voids within the boundaries of the retort site to form a fragmented permeable mass of particles containing oil shale in each retort. Following formation of each retort, the retort access drifts on the advancing side of the retort are at least partially sealed, preferably with a mass of formation particles covered by a gas impermeable layer and backfilled with a further mass of formation particles.
REFERENCES:
patent: 3469405 (1969-09-01), Reinhold
patent: 3583165 (1971-06-01), West et al.
patent: 3917344 (1975-11-01), Janssen et al.
patent: 4017119 (1977-04-01), Lewis
patent: 4044563 (1977-08-01), Hurst et al.
RI-4164, U.S. Dept. of Interior, Bureau of Mines, Report of Investigations, "Experiment in Underground Gasification of Coal," Gorgas, Ala., Aug. 1947, pp. 12, 13, 21, 22 and FIGS. 4, 6, 7 and 13-15.
Novosad Stephen J.
Occidental Oil Shale
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