Method for minimizing subsidence effects during production of coal in situ
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United States of America Patent
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-
Mar 20, 1984
Grant Date -
N/A
app pub date -
Jun 15, 1981
filing date -
Jun 15, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Coal is reduced to ash in place by gasification using in situ production techniques, resulting in significant void space underground, which in turn causes roof fall and subsidence. Overburden collapse is stabilized by backfilling with foaming mud cement that hardens into an expanded solid, which quenches and fills the production module and seals residual ash. Rubble volumes and subsidence cracks are sealed against water incursions and contaminated water excursions. Surface facilities above barrier pillars are protected from destructive forces of subsidence draw.
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