E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/36
E21B 43/24 (2006.01)
Patent
CA 1054929
BE IT KNOWN THAT RICHARD D. RIDLEY of 2224 North First Avenue, Grand Junction, Colorado, United States of America, having made an invention entitled: "In situ recovery of shale oil" the following disclosure contains a correct and full description of the invention and of the best mode known to the inventor of taking advantage of the same. ABSTRACT An in situ oil shale retort is formed in a subterranean oil shale deposit by excavating one or more columnar voids each having at least one upright planar free face, 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 the or each free face in a layer or in a plurality of layers severed in a sequence progressing away from the free face, 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 its expansion. The free face(s) extend across the entire width (or length) of the retort being formed. A workroom having a horizontal floor plan that coincides approximately, with the horizontal cross-section of the retort to be formed is preferably excavated so as to intersect the columnar void, the blasting holes being drilled and loaded with explosive from the workroom. - 1 -
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