Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1976-02-17
1977-08-23
Novosad, Stephen J.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
102 23, 166259, 166299, 299 13, E21B 4324, E21B 4326, E21C 4110
Patent
active
040435970
ABSTRACT:
A subterranean deposit containing oil shale is prepared for in situ retorting by initially excavating a plurality of vertically spaced apart voids of similar horizontal cross section located one above another within the deposit. A zone of unfragmented deposit temporarily left between each adjacent pair of voids has a thickness greater than the smallest lateral dimension of the voids above and below it. Explosive placed in a lower portion of the unfragmented zone is detonated to expand the lower portion of the unfragmented zone into the lower void, leaving the upper portion of the zone intact and creating a space free of fragmented particles below it. Thereafter, the remaining portion of the unfragmented zone is explosively expanded into the open space below it and into the upper void, forming a subterranean room filled with a fragmented mass of particles having a void volume substantially equal to the total initial volume of the voids. Retorting of the expanded mass is then carried out to recover shale oil from the oil shale.
REFERENCES:
patent: 1842664 (1932-01-01), Elsing
patent: 3001776 (1961-09-01), Van Poollen
patent: 3582138 (1971-06-01), Loofbourow et al.
patent: 3688843 (1972-09-01), Nordyke
patent: 3712677 (1973-01-01), Janssen
patent: 3957306 (1976-05-01), Closmann
Jackson et al., "Stoping Methods and Costs", U.S. Dept. of the Interior, Bureau of Mines Bulletin No. 390, 1936, pp. 2-19.
E. I. Du Pont de Nemours & Company, Blasters Handbook, 1969, pp, 240-244, 343-345.
Cummins et al., SME Mining Engineering Handbook, Society of Mining Engineers, 1972, pp. 12-5, 12-135 through 12-150, and 12-162 through 12-233.
Novosad Stephen J.
Occidental Oil Shale Inc.
Suchfield George A.
LandOfFree
Multiple level preparation of oil shale retort does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multiple level preparation of oil shale retort, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiple level preparation of oil shale retort will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2311800