In situ oil shale retort having horizontal voids with side pillars
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United States of America Patent
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Jun 12, 1984
Grant Date -
N/A
app pub date -
Feb 18, 1982
filing date -
Feb 18, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An in situ oil shale retort is formed in a subterranean formation containing oil shale by excavating one or more horizontally extending voids across a retort site, leaving a zone of unfragmented formation having a horizontal free face adjacent such a horizontal void. In one embodiment, such a horizontal void is excavated across less than the entire width of the retort site, leaving 'side pillars' of unfragmented formation spaced inwardly from adjacent side boundaries of the retort site at opposite sides of such a horizontal void. This reduces the maximum span of the horizontal void, when compared with supporting overburden above the void with one or more interior isolated pillars spaced inwardly from the side boundaries of the retort. The side pillars are explosively expanded. Then such a zone of unfragmented formation is explosively expanded toward such a horizontal void for forming a fragmented permeable mass of formation particles containing oil shale in the retort. The resulting fragmented mass can have a slightly narrowed region along the sides where the side pillars were present.
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