04457374 is referenced by 233 patents and cites 10 patents.

A process is provided for determining retorting conditions in an in situ oil shale retort. In the process, the thickness of the hot shale zone is determined by monitoring the off gases in response to changing the feed conditions, such as the temperature or flow rate, of the feed gas. The location and depth of the hot shale zone can be determined by monitoring the response time and temperature of the off gases when the proportion of steam and air in the feed gas is changed. The depth of the mineral decomposition zone can be monitored by monitoring the amount of carbon dioxide produced when the air content of the feed gas is substantially reduced. The depth of the kerogen decomposition zone can be determined by monitoring the amount of hydrogen saturated gases produced when the inflow of air in the feed gas is stopped.

Title
Transient response process for detecting in situ retorting conditions
Application Number
6/393432
Publication Number
4457374
Application Date
June 29, 1982
Publication Date
July 3, 1984
Inventor
John M Forgac
Elmhurst
IL, US
George R Hoekstra
Bolingbrook
IL, US
Agent
William H Magidson
William T McClain
Thomas W Tolpin
Assignee
Standard Oil Company
IL, US
IPC
E21B 47/06
E21B 43/247
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