Explosive expansion of formation in lifts for forming an in situ oil shale retort
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United States of America Patent
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-
Apr 17, 1984
Grant Date -
N/A
app pub date -
Jul 9, 1981
filing date -
Jul 9, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An in situ oil shale retort is formed by excavating a lower level void adjacent the bottom boundary of a retort site in a subterranean formation, leaving a zone of unfragmented formation within side boundaries of the retort overlying the void. At least a portion of the overlying zone is explosively expanded downwardly towards the void in a plurality of lifts. Vertical columnar explosive charges are placed in each lift and detonated in a single round with a time delay between successive lifts sufficient for formation of the first lift to move out of the way and not interfere with initial explosive expansion of formation in the next successive lift. Preferably, the explosive charges in a second lift are detonated after detonation of explosive charges in a first lift with a time delay in the range of from about five to thirty milliseconds per foot of burden distance of the charges in the second lift. When plural lifts above the first lift are explosively expanded, it is preferred that the time delays progressively increase from the bottom up.
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