Wells – Processes – In situ combustion
Patent
1979-05-04
1981-01-06
Novosad, Stephen J.
Wells
Processes
In situ combustion
166251, 299 2, 299 13, E21B 43243, E21B 4326, E21C 4110
Patent
active
042431000
ABSTRACT:
An in situ oil shale retort is formed with an upper surface of a fragmented permeable mass in the retort separated from a top boundary of unfragmented formation, creating an inlet plenum void. A primary combustion zone is established in the fragmented mass, and such primary combustion zone is caused to spread laterally by the establishment of a secondary combustion zone. During a first period of time, the temperature in the inlet plenum void is maintained at less than the temperature at which unfragmented formation from above the top boundary will slough into the void. The primary combustion zone is advanced through the retort and liquid and gaseous products of retorting are withdrawn. During a second period of time the temperature in the inlet plenum void is increased to increase the temperature of the top boundary of unfragmented formation to a temperature which will cause unfragmented formation from above the top boundary to slough into the void. Preferably, sufficient formation is sloughed for substantially completely filling such void to provide support for overlying formation after completion of retorting.
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patent: 3692110 (1972-09-01), Grady
patent: 3952801 (1976-04-01), Burton
patent: 4027917 (1977-06-01), Bartel et al.
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patent: 4118071 (1978-10-01), Hutchins
patent: 4147389 (1979-04-01), Bartel et al.
Novosad Stephen J.
Occidental Oil Shale Inc.
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