E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/36
E21B 43/24 (2006.01) E21C 41/10 (1980.01)
Patent
CA 1163918
ABSTRACT A method for the in situ processing of oil shale ore includes the establishment of underground stopes by removing from each a portion of the oil shale ore therein, rubblizing the remaining ore in each stope, extracting the rubblized ore and crushing it to obtain a desired particle size for subsequent processing, and restoring the sized oil shale particles to the stope by backfilling the stope as the rubble is extracted. The stope is maintained substantially filled with ore to provide lateral support to the sidewalls and reduce the likelihood of caving in the stope. The oil shale is retorted by injection of hot gas into the stope, and residual carbon is recovered from the retorted ore as producer fuel gas. The sensible heat in the ore may thereafter be recovered for use in retorting oil shale ore in an adjacent stope. Nahcolite may be recovered from a nahcolite-bearing oil shale ore by crushing the rubblized ore to obtain a first fraction of smaller nahcolite particles and a second fraction of crushed oil shale particles having the size desired for retorting, and separating the smaller nahcolite particles from the larger oil shale particles prior to backfilling of the stope. If the shale is dawsonitic, soda ash and alumina may be recovered from the spent shale by leaching the stopes after retorting. A method of retorting is also disclosed in which three retorts are operated in series, the first retort comprising a gas heating retort, the second a carbon recovery retort, and the third an active kerogen-recovery retort.
382644
Multi Mineral Corporation
Riches Mckenzie & Herbert Llp
LandOfFree
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