In situ processing of oil shale

Details In situ processing of oil shale In situ processing of oil shale

E - Fixed Constructions

21

B

166/36

E21B 43/24 (2006.01) C10G 1/00 (2006.01)

Patent

CA 1061711

Abstract of the Disclosure Process for in situ retorting of oil shale, wherein retorting is carried out through a bed of broken pieces of shale, with pillars of unfrag- mented raw shale provided between the oil shale retorts. This is accomplished according to the invention by establishing an additional or secondary combus- tion zone above the primary combustion zone therein and preferably near the top of the oil shale retorts. In one embodiment the secondary combustion zone is maintained by introducing into the top of the retorts shale oil pro- duced from retorting, together with air and combustible off gas from retort- ing. The supply of shale oil to the top of the retorts is discontinued when the heating value of off gas from the retort is sufficient to provide the minimum combustion temperature of the gas introduced into the top of the retort.

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