Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1980-10-14
1982-06-29
Novosad, Stephen J.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
166259, 166299, 299 13, E21B 43247, E21B 43263, E21C 4110
Patent
active
043369669
ABSTRACT:
An in situ oil shale retort in a subterranean formation contains a fragmented permeable mass of formation particles. Such a fragmented mass is formed by excavating a horizontally extending void within the boundaries of the retort, leaving a zone of unfragmented formation above and/or below such a void. A plurality of vertical blasting holes are drilled in such a zone and loaded with explosive charges for forming an array of explosive charges sufficiently close together to interact and fragment formation substantially to a plane at the ends of the charges remote from the void. The scaled depth of burial of such an array is in the range of from about 6 to 12 mm/cal.sup.1/3. The explosive charges are detonated in a single round for expanding such a zone towards the void for forming the fragmented mass of particles in the retort.
REFERENCES:
patent: 3661423 (1972-05-01), Garrett
patent: 3917346 (1975-11-01), Janssen
patent: 4043597 (1977-08-01), French
patent: 4043598 (1977-08-01), French et al.
patent: 4118071 (1978-10-01), Hutchins
patent: 4135450 (1979-01-01), Lang
Redpath, Bruce B., "Application of Cratering Characteristics to Conventional Blast Design", Monograph I on Rock Mechanics Applications in Mining, 1977.
Lang, L. C., "The Application of Spherical Charge Technology in Stope and Pillar Mining", Engineering and Mining Journal, May, 1976, pp. 98-101.
Novosad Stephen J.
Occidental Oil Shale Inc.
Suchfield George A.
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