Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1977-09-14
1979-03-27
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
Patent
active
041462726
ABSTRACT:
A subterranean formation containing oil shale is prepared for in situ retorting by initially excavating a pair of spaced apart voids, leaving an intervening zone of unfragmented formation between the voids. The intervening zone has substantially parallel free faces adjoining the void. A plurality of elongated blasting holes are formed in the intervening zone of unfragmented formation, the longitudinal axis of each blasting hole being substantially perpendicular to the parallel free faces of the intervening zone. At least two deck loads of explosives are placed in each blasting hole, with each load being longitudinally spaced apart from each adjacent load by stemming. The loads of explosive are then detonated in a single round of explosions with a time delay between adjacent loads for expanding formation in the intervening zones toward both voids. The fragmented mass of formation particles is then retorted to recover shale oil from the oil shale.
REFERENCES:
patent: 2609750 (1952-09-01), McFarland
patent: 3001776 (1961-09-01), Van Poollen
patent: 3316020 (1967-04-01), Bergstrom
patent: 3434757 (1969-03-01), Prats
patent: 3537753 (1970-11-01), Arendt
patent: 3688843 (1972-09-01), Nordyke
patent: 3714895 (1973-02-01), Rawson
patent: 4043597 (1977-08-01), French
Lang, L. C., "The Application of Spherical Charge Technology in Stope and Pillar Mining", Engineering and Mining Journal, May, 1976, pp. 98-101.
Blakey, P. N. et al, "Kidd Creek's Innovative Blast Hole Sublevel Stoping", Mining Engineering, Jun., 1976, pp. 25-31.
"Facts About Delay Blasting", from Du Pont Research.
E. I. Du Pont de Nemours and Co., Blasters' Handbook; (1969), 15th Edition; pp. 220, 229, 230, 246, 247, 402, and 403.
Novosad Stephen J.
Occidental Oil Shale Inc.
Suchfield George A.
LandOfFree
Explosive placement for explosive expansion toward spaced apart does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Explosive placement for explosive expansion toward spaced apart , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Explosive placement for explosive expansion toward spaced apart will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1819298