E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/23
E21B 43/263 (2006.01)
Patent
CA 1125648
ABSTRACT Formation is excavated from within a retort site in formation con- taining oil shale for forming a plurality of vertically spaced apart voids extending horizontally across different levels of the retort site, leaving a separate zone of unfragmented formation beneath each void. Explosive is placed in each zone, and such explosive is detonated in a single round for forming an in situ retort containing a fragmented permeable mass of forma- tion particles containing oil shale. Formation is explosively expanded upwardly and downwardly toward each void. A horizontal void excavated at a production level has a smaller horizontal cross-sectional area than a void excavated at a lower level of the retort site immediately above the produc- tion level void. Explosive in a first group of vertical blast holes is detonated for explosively expanding formation upwardly toward the lower void, and explosive in a second group of vertical blast holes is detonated in the same round for explosively expanding formation upwardly toward the lower void and downwardly toward the production level void for forming a general- ly T-shaped bottom of the fragmented mass.
382732
Occidental Oil Shale Inc.
Smart & Biggar
LandOfFree
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