Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1984-03-29
1985-08-06
Novosad, Stephen J.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
166259, 299 13, E21C 4110, E21B 43247, E21B 43263
Patent
active
045331812
ABSTRACT:
An in situ oil shale retort containing a fragmented permeable mass of formation particles having a generally uniform permeability across horizontal cross-sections of the retort is provided. To form the retort, a void is excavated in a subterranean formation within the boundaries of the retort site, while at least one zone of unfragmented formation is left adjacent the void. A plurality of explosive charges are placed in the zone of unfragmented formation in a selected pattern; an array of central explosive charges and a plurality of perimeter charges arranged in rows surrounding the central charges. The spacing distance between each row of perimeter charges and an adjacent outer row of central charges is about equal. The combination of spacing distance and powder factor of the central charges is selected to produce a center portion of the fragmented permeable mass having a first average particle size (d.sub.1) and a first average void fraction (e.sub.1). The powder factor for each row of perimeter charges and the spacing distance between each outer row of central charges and an adjacent row of perimeter charges is selected to produce a perimeter portion of the fragmented permeable mass having a second particle size (d.sub.2) and a second void fraction (e.sub.2), the second average particle size (d.sub.2) and the second average void fraction (e.sub.2) being related to the first average particle size (d.sub.1) and the first average void fraction (e.sub.1) so that the relation ##EQU1## is in the range of from about 0.1 to 6.0.
REFERENCES:
patent: 4359246 (1982-11-01), Ricketts
patent: 4366987 (1983-01-01), Ricketts et al.
patent: 4372615 (1983-02-01), Ricketts
patent: 4402550 (1983-09-01), Ricketts
patent: 4423907 (1984-01-01), Ridley
Handbook of Fluid Dynamics, Victor L. Streeter, 1st Ed., McGraw-Hill (1961), pp. 17-33 and 17-34.
Goodwin M.
Novosad Stephen J.
Occidental Oil Shale Inc.
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