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

1983-04-18

1984-05-15

Suchfield, George A.

Wells

Processes

Cyclic injection then production of a single well

166258, 166261, 166268, 166292, E21B 4300, E21B 43243

Patent

active

044482523

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: 1093031 (1914-04-01), Brown
patent: 2561639 (1951-07-01), Squires
patent: 2973811 (1961-03-01), Rogers
patent: 4024914 (1977-05-01), Kreinin
patent: 4083402 (1978-04-01), Antonova et al.
patent: 4114688 (1978-09-01), Terry
patent: 4393934 (1983-07-01), Savins et al.

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