Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1980-11-17
1982-08-31
Purser, Ernest R.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
102312, 299 13, E21C 4110
Patent
active
043469353
ABSTRACT:
A subterranean formation containing oil shale is prepared for in situ retorting by initially excavating a void in a lower portion of a retort site. A primary sub-round of explosive is placed in a portion of formation within the retort site above the void, and a secondary sub-round of explosive is also placed in unfragmented formation above the void. In one embodiment, the primary sub-round comprises explosive placed in separate pairs of longitudinally spaced apart upwardly converging blasting holes. Explosive in the primary sub-round is detonated for fracturing unfragmented formation along a boundary defined by the upwardly converging blasting holes to separate a portion of formation from adjacent unfragmented formation for forming at least one new face above the separated portion of formation. The separated formation contains the secondary sub-round which is detonated after the separated formation commences moving under gravity toward the void, and before the separated formation reaches the bottom of the void, for explosively expanding the separated formation toward the new face and toward the void for forming at least a portion of a fragmented permeable mass of formation particles in an in situ oil shale retort.
REFERENCES:
patent: 3466094 (1969-09-01), Haworth et al.
patent: 3863987 (1975-02-01), Lampard
patent: 3980339 (1976-09-01), Heald et al.
SME Mining Engineering Handbook, 1973, vol. 1, pp. 10-81 to 10-88, 11-96 to 11-98.
Langefors & Kihlstrom, "The Modern Technique of Rock Blasting," 1963, pp. 296-321.
Blasters' Handbook, DuPont, 15th Ed., pp. 246-247, 412-419.
Occidental Oil Shale Inc.
Purser Ernest R.
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