Wells – Processes – Separating material entering well
Patent
1975-12-10
1977-04-19
Novosad, Stephen J.
Wells
Processes
Separating material entering well
166267, 166272, 299 2, E21B 4324
Patent
active
040182800
ABSTRACT:
A process for in situ retorting of oil shale wherein an externally heated gas is circulated through a first retort zone. Surface retorting units comprised of compressors and furnaces are used to start the retorting process and to continue same until the off gas being recovered from the first retort zone reaches a temperature condition which is indicative that adequate heat is available in the retort zone to complete the retorting process without further external heating of the retorting gas. The surface retorting units are then replaced with frontal advance units comprised of low head fans which are capable of circulating the required volume of retorting gas but which require substantially less power to operate than the compressors. Also, when the units are interchanged the off gas from the first retort zone is diverted through a second retort zone to cool the off gas and to preheat the second zone.
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Daviduk Nicholas
Lewis David W.
Siuta Michael T.
Faulconer Drude
Huggett C. A.
Mobil Oil Corporation
Novosad Stephen J.
Suchfield George A.
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