In situ oil shale retort with controlled permeability for unifor

Details In situ oil shale retort with controlled permeability for unifor In situ oil shale retort with controlled permeability for unifor

1984-03-19

1985-11-12

Suchfield, George A.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

166259, 299 13, E21B 43247, E21C 4110, C10B 5720

Patent

active

045524092

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, underground formation is explosively expanded by explosive charges placed in a selected pattern. The combination of spacing distance and powder factor of central explosive 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 perimeter explosive charges and the spacing distance between central charges and adjacent perimeter charges are 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) are 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 0.33 to 3.0.

REFERENCES:
patent: 3951456 (1976-04-01), Ridley
patent: 3980339 (1976-09-01), Heald et al.
patent: 4266826 (1981-05-01), French
patent: 4359246 (1982-11-01), Ricketts
patent: 4402550 (1983-09-01), Ricketts
patent: 4443037 (1984-04-01), Ricketts
Handbook of Fluid Dynamics, Victor L. Streeter, 1st Ed., McGraw-Hill (1961), pp. 17-33 and 17-34.

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