Fragmentation of subterranean formations

Details Fragmentation of subterranean formations Fragmentation of subterranean formations

E - Fixed Constructions

21

B

166/23

E21B 43/24 (2006.01) E21B 43/248 (2006.01)

Patent

CA 1095831

A B S T R A C T A subterranean formation containing, for example, 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 inter- vening zone has substantially parallel free faces adjoining the void. A plurality of elongate blasting holes are formed in the intervening zone of unfragmented formation, the longitudinal axis of each blasting hole being substant- ially 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 longit- udinally spaced apart from each adjacent charge 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 zone toward both voids. The fragmented mass of formation particles is then retorted to recover, for example, shale oil from the oil shale.

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