Minimizing subsidence effects during production of coal in situ

Details Minimizing subsidence effects during production of coal in situ Minimizing subsidence effects during production of coal in situ

1983-03-28

1984-08-07

Purser, Ernest R.

Wells

Processes

Cementing, plugging or consolidating

166241, E21B 3300

Patent

active

044638078

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.

REFERENCES:
patent: 3354956 (1967-11-01), Critz
patent: 3439744 (1969-04-01), Bradley
patent: 3650327 (1972-03-01), Burnside
patent: 3924680 (1975-12-01), Terry

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