Wells – Processes – In situ combustion
Patent
1979-01-08
1980-10-14
Novosad, Stephen J.
Wells
Processes
In situ combustion
299 2, 299 13, E21B 4324, E21B 4326
Patent
active
042275741
ABSTRACT:
A method is disclosed for recovering liquid and gaseous products from an in situ oil shale retort having a plurality of strata of formation extending through the retort site with at least one stratum of formation having a higher average kerogen content than the average kerogen content of the formation within the retort site. The method includes the steps of excavating at least one void within the retort site and explosively expanding unfragmented formation toward such a void for forming a fragmented permeable mass of formation particles containing oil shale. The fragmented mass has a lower portion and an upper layer containing fragmented particles substantially from the stratum of formation having a higher average kerogen content. The upper layer of the fragmented mass has a higher average kerogen content than the average kerogen content of the fragmented mass. The upper layer is ignited for establishing a combustion zone in the fragmented mass. A combustion zone feed is introduced to the top of the fragmented mass and an off gas is withdrawn from the bottom of the fragmented mass for maintaining and advancing the combustion zone and for forming a retorting zone on the advancing side of the combustion zone. Oil Shale is retorted in the retorting zone producing liquid and gaseous products. The liquid and gaseous products produced are recovered from the fragmented mass.
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Novosad Stephen J.
Occidental Oil Shale Inc.
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