Wells – Processes – In situ combustion
Patent
1977-06-13
1978-11-21
Novosad, Stephen J.
Wells
Processes
In situ combustion
166259, 48197R, 208 11R, 208 11LE, 299 2, E21B 4324
Patent
active
041261801
ABSTRACT:
To recover liquid and gaseous products from a fragmented permeable mass of particles containing oil shale, a buffer zone containing retorted oil shale is established in the fragmented mass by passing a hot processing gas substantially free of free oxygen through at least a portion of the fragmented mass. Thereafter, a combustion zone is established in the buffer zone, and a combustion zone feed containing oxygen is introduced into the fragmented mass on the trailing side of the combustion zone. This advances the combustion zone through the fragmented mass and retorts oil shale in a retorting zone on the advancing side of the combustion zone. The thickness of the buffer zone is sufficient for reaction of most of the oxygen in the combustion zone feed with residual carbonaceous material in retorted oil shale in the buffer zone.
REFERENCES:
patent: 3342257 (1967-09-01), Jacobs et al.
patent: 3454958 (1969-07-01), Parker
patent: 3460620 (1969-08-01), Parker
patent: 3499489 (1970-03-01), Parker
patent: 3521709 (1970-07-01), Needham
patent: 3537528 (1970-11-01), Herce et al.
patent: 3548938 (1970-12-01), Parker
patent: 3586377 (1971-06-01), Ellington
Novosad Stephen J.
Occidental Oil Shale Inc.
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