Forming shale oil recovery retort by blasting into slot-shaped c

Mining or in situ disintegration of hard material – Tunnel recovery of fluid material

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102 23, 299 13, E21C 4110

Patent

active

040435962

ABSTRACT:
An in situ oil shale retort is formed in a subterranean oil shale deposit by excavating one or more slot-shaped columnar voids each having a pair of vertically extending, planar free faces, drilling blasting holes adjacent to the columnar void and parallel to the free faces, loading the blasting holes with explosive, and detonating the explosive in a single round to expand the shale adjacent to the columnar void one directionally toward each free face in one or more planar layers severed in a sequence progressing away from each free face and to fill with fragmented oil shale the columnar void and the space in the in situ retort originally occupied by the expanded shale prior to the expansion. The pair of free faces extend across the entire width (or length) of the retort being formed. A room having a horizontal floor plan that coincides approximately, with the horizontal cross section of the retort to be formed is excavated so as to intersect the columnar void. The blasting holes are drilled and loaded with explosive from the room.

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